ID CVE-2015-5600
Summary The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
References
Vulnerable Configurations
  • OpenBSD OpenSSH 6.9
    cpe:2.3:a:openbsd:openssh:6.9
CVSS
Base: 8.5 (as of 20-10-2016 - 10:18)
Impact:
Exploitability:
CWE CWE-264
CAPEC
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Blue Boxing
    This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
  • Target Programs with Elevated Privileges
    This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL NONE COMPLETE
nessus via4
  • NASL family OracleVM Local Security Checks
    NASL id ORACLEVM_OVMSA-2016-0038.NASL
    description The remote OracleVM system is missing necessary patches to address critical security updates : - CVE-2015-5600: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices (#1245969) - CVE-2016-3115: missing sanitisation of input for X11 forwarding (#1317816) - SSH2_MSG_DISCONNECT for user initiated disconnect follow RFC 4253 (#1222500) - Add missing dot in ssh manual page (#1197763) - Fix minor problems found by covscan/gcc (#1196063) - Add missing options in man ssh (#1197763) - Add KbdInteractiveAuthentication documentation to man sshd_config (#1109251) - Correct freeing newkeys structure when privileged monitor exits (#1208584) - Fix problems with failing persistent connections (#1131585) - Fix memory leaks in auditing patch (#1208584) - Better approach to logging sftp commands in chroot - Make sshd -T write all config options and add missing Cipher, MAC to man (#1109251) - Add missing ControlPersist option to man ssh (#1197763) - Add sftp option to force mode of created files (#1191055) - Do not load RSA1 keys in FIPS mode (#1197072) - Add missing support for ECDSA in ssh-keyscan (#1196331) - Fix coverity/gcc issues (#1196063) - Backport wildcard functionality for PermitOpen in sshd_config file (#1159055) - Ability to specify an arbitrary LDAP filter in ldap.conf (#1119506) - Fix ControlPersist option with ProxyCommand (#1160487) - Backport fix of ssh-keygen with error : gethostname: File name too long (#1161454) - Backport show remote address instead of UNKNOWN after timeout at password prompt (#1161449) - Fix printing of extensions in v01 certificates (#1093869) - Fix confusing audit trail for unsuccessful logins (#1127312) - Don't close fds for internal sftp sessions (#1085710) - Fix config parsing quotes (backport) (#1134938) - Enable logging in chroot into separate file (#1172224) - Fix auditing when using combination of ForcedCommand and PTY (#1131585) - Fix ssh-copy-id on non-sh remote shells (#1135521) - ignore SIGXFSZ in postauth monitor child (#1133906) - don't try to generate DSA keys in the init script in FIPS mode (#1118735) - ignore SIGPIPE in ssh-keyscan (#1108836) - ssh-add: fix fatal exit when removing card (#1042519) - fix race in backported ControlPersist patch (#953088) - skip requesting smartcard PIN when removing keys from agent (#1042519) - add possibility to autocreate only RSA key into initscript (#1111568) - fix several issues reported by coverity - x11 forwarding - be less restrictive when can't bind to one of available addresses (#1027197) - better fork error detection in audit patch (#1028643) - fix openssh-5.3p1-x11.patch for non-linux platforms (#1100913) - prevent a server from skipping SSHFP lookup (#1081338) (CVE-2014-2653) - ignore environment variables with embedded '=' or '\0' characters (CVE-2014-2532) - backport ControlPersist option (#953088) - log when a client requests an interactive session and only sftp is allowed (#997377) - don't try to load RSA1 host key in FIPS mode (#1009959) - restore Linux oom_adj setting when handling SIGHUP to maintain behaviour over restart (#1010429) - ssh-keygen -V - relative-specified certificate expiry time should be relative to current time (#1022459) - adjust the key echange DH groups and ssh-keygen according to SP800-131A (#993580) - log failed integrity test if /etc/system-fips exists (#1020803) - backport ECDSA and ECDH support (#1028335) - use dracut-fips package to determine if a FIPS module is installed (#1001565) - use dist tag in suffixes for hmac checksum files (#1001565) - use hmac_suffix for ssh[,d] hmac checksums (#1001565) - fix NSS keys support (#1004763) - change default value of MaxStartups - CVE-2010-5107 - #908707 - add -fips subpackages that contains the FIPS module files (#1001565) - don't use SSH_FP_MD5 for fingerprints in FIPS mode (#998835) - do ssh_gssapi_krb5_storecreds twice - before and after pam sesssion (#974096) - bump the minimum value of SSH_USE_STRONG_RNG to 14 according to SP800-131A (#993577) - fixed an issue with broken 'ssh -I pkcs11' (#908038) - abort non-subsystem sessions to forced internal sftp-server (#993509) - reverted 'store krb5 credentials after a pam session is created (#974096)' - Add support for certificate key types for users and hosts (#906872) - Apply RFC3454 stringprep to banners when possible (#955792) - fix chroot logging issue (#872169) - change the bad key permissions error message (#880575) - fix a race condition in ssh-agent (#896561) - backport support for PKCS11 from openssh-5.4p1 (#908038) - add a KexAlgorithms knob to the client and server configuration (#951704) - fix parsing logic of ldap.conf file (#954094) - Add HMAC-SHA2 algorithm support (#969565) - store krb5 credentials after a pam session is created (#974096)
    last seen 2019-02-21
    modified 2018-07-24
    plugin id 90076
    published 2016-03-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90076
    title OracleVM 3.3 / 3.4 : openssh (OVMSA-2016-0038)
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2016-3531.NASL
    description Description of changes: [4.3p2-82.0.2] - CVE-2015-5600: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices (John Haxby) [orabug 22985024] - CVE-2016-3115: missing sanitisation of input for X11 forwarding (John Haxby) [orabug 22985024]
    last seen 2019-02-21
    modified 2016-10-19
    plugin id 90342
    published 2016-04-05
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90342
    title Oracle Linux 5 : openssh (ELSA-2016-3531)
  • NASL family MacOS X Local Security Checks
    NASL id MACOSX_10_10_5.NASL
    description The remote host is running a version of Mac OS X 10.10.x that is prior to 10.10.5. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - apache_mod_php - Apple ID OD Plug-in - AppleGraphicsControl - Bluetooth - bootp - CloudKit - CoreMedia Playback - CoreText - curl - Data Detectors Engine - Date & Time pref pane - Dictionary Application - DiskImages - dyld - FontParser - groff - ImageIO - Install Framework Legacy - IOFireWireFamily - IOGraphics - IOHIDFamily - Kernel - Libc - Libinfo - libpthread - libxml2 - libxpc - mail_cmds - Notification Center OSX - ntfs - OpenSSH - OpenSSL - perl - PostgreSQL - python - QL Office - Quartz Composer Framework - Quick Look - QuickTime 7 - SceneKit - Security - SMBClient - Speech UI - sudo - tcpdump - Text Formats - udf Note that successful exploitation of the most serious issues can result in arbitrary code execution.
    last seen 2019-02-21
    modified 2018-07-16
    plugin id 85408
    published 2015-08-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85408
    title Mac OS X 10.10.x < 10.10.5 Multiple Vulnerabilities
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2016-0466.NASL
    description From Red Hat Security Advisory 2016:0466 : Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. (CVE-2016-3115) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
    last seen 2019-02-21
    modified 2018-07-24
    plugin id 90075
    published 2016-03-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90075
    title Oracle Linux 6 : openssh (ELSA-2016-0466)
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2016-0466.NASL
    description Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. (CVE-2016-3115) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 90079
    published 2016-03-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90079
    title RHEL 6 : openssh (RHSA-2016:0466)
  • NASL family Misc.
    NASL id OPENSSH_MAXAUTHTRIES_BRUTEFORCE.NASL
    description The remote SSH server is affected by a security bypass vulnerability due to a flaw in the keyboard-interactive authentication mechanisms. The kbdint_next_device() function in auth2-chall.c improperly restricts the processing of keyboard-interactive devices within a single connection. A remote attacker can exploit this, via a crafted keyboard-interactive 'devices' string, to bypass the normal restriction of 6 login attempts (MaxAuthTries), resulting in the ability to conduct a brute-force attack or cause a denial of service condition.
    last seen 2019-02-21
    modified 2018-07-16
    plugin id 86122
    published 2015-09-24
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86122
    title OpenSSH MaxAuthTries Bypass
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2015-2088.NASL
    description Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) It was found that the OpenSSH ssh-agent, a program to hold private keys used for public key authentication, was vulnerable to password guessing attacks. An attacker able to connect to the agent could use this flaw to conduct a brute-force attack to unlock keys in the ssh-agent. (BZ#1238238) This update fixes the following bugs : * Previously, the sshd_config(5) man page was misleading and could thus confuse the user. This update improves the man page text to clearly describe the AllowGroups feature. (BZ#1150007) * The limit for the function for restricting the number of files listed using the wildcard character (*) that prevents the Denial of Service (DoS) for both server and client was previously set too low. Consequently, the user reaching the limit was prevented from listing a directory with a large number of files over Secure File Transfer Protocol (SFTP). This update increases the aforementioned limit, thus fixing this bug. (BZ#1160377) * When the ForceCommand option with a pseudoterminal was used and the MaxSession option was set to '2', multiplexed SSH connections did not work as expected. After the user attempted to open a second multiplexed connection, the attempt failed if the first connection was still open. This update modifies OpenSSH to issue only one audit message per session, and the user is thus able to open two multiplexed connections in this situation. (BZ#1199112) * The ssh-copy-id utility failed if the account on the remote server did not use an sh-like shell. Remote commands have been modified to run in an sh-like shell, and ssh-copy-id now works also with non-sh-like shells. (BZ#1201758) * Due to a race condition between auditing messages and answers when using ControlMaster multiplexing, one session in the shared connection randomly and unexpectedly exited the connection. This update fixes the race condition in the auditing code, and multiplexing connections now work as expected even with a number of sessions created at once. (BZ#1240613) In addition, this update adds the following enhancements : * As not all Lightweight Directory Access Protocol (LDAP) servers possess a default schema, as expected by the ssh-ldap-helper program, this update provides the user with an ability to adjust the LDAP query to get public keys from servers with a different schema, while the default functionality stays untouched. (BZ#1201753) * With this enhancement update, the administrator is able to set permissions for files uploaded using Secure File Transfer Protocol (SFTP). (BZ#1197989) * This update provides the LDAP schema in LDAP Data Interchange Format (LDIF) format as a complement to the old schema previously accepted by OpenLDAP. (BZ#1184938) * With this update, the user can selectively disable the Generic Security Services API (GSSAPI) key exchange algorithms as any normal key exchange. (BZ#1253062) Users of openssh are advised to upgrade to these updated packages, which correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 86967
    published 2015-11-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86967
    title RHEL 7 : openssh (RHSA-2015:2088)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201512-04.NASL
    description The remote host is affected by the vulnerability described in GLSA-201512-04 (OpenSSH: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details. Impact : Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2015-12-22
    plugin id 87545
    published 2015-12-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=87545
    title GLSA-201512-04 : OpenSSH: Multiple vulnerabilities
  • NASL family Amazon Linux Local Security Checks
    NASL id ALA_ALAS-2015-625.NASL
    description A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges.
    last seen 2019-02-21
    modified 2018-04-18
    plugin id 87351
    published 2015-12-15
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=87351
    title Amazon Linux AMI : openssh (ALAS-2015-625)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20151119_OPENSSH_ON_SL7_X.NASL
    description A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) It was found that the OpenSSH ssh-agent, a program to hold private keys used for public key authentication, was vulnerable to password guessing attacks. An attacker able to connect to the agent could use this flaw to conduct a brute-force attack to unlock keys in the ssh-agent. This update fixes the following bugs : - Previously, the sshd_config(5) man page was misleading and could thus confuse the user. This update improves the man page text to clearly describe the AllowGroups feature. - The limit for the function for restricting the number of files listed using the wildcard character (*) that prevents the Denial of Service (DoS) for both server and client was previously set too low. Consequently, the user reaching the limit was prevented from listing a directory with a large number of files over Secure File Transfer Protocol (SFTP). This update increases the aforementioned limit, thus fixing this bug. - When the ForceCommand option with a pseudoterminal was used and the MaxSession option was set to '2', multiplexed SSH connections did not work as expected. After the user attempted to open a second multiplexed connection, the attempt failed if the first connection was still open. This update modifies OpenSSH to issue only one audit message per session, and the user is thus able to open two multiplexed connections in this situation. - The ssh-copy-id utility failed if the account on the remote server did not use an sh-like shell. Remote commands have been modified to run in an sh-like shell, and ssh-copy-id now works also with non-sh-like shells. - Due to a race condition between auditing messages and answers when using ControlMaster multiplexing, one session in the shared connection randomly and unexpectedly exited the connection. This update fixes the race condition in the auditing code, and multiplexing connections now work as expected even with a number of sessions created at once. In addition, this update adds the following enhancements : - As not all Lightweight Directory Access Protocol (LDAP) servers possess a default schema, as expected by the ssh-ldap-helper program, this update provides the user with an ability to adjust the LDAP query to get public keys from servers with a different schema, while the default functionality stays untouched. - With this enhancement update, the administrator is able to set permissions for files uploaded using Secure File Transfer Protocol (SFTP). - This update provides the LDAP schema in LDAP Data Interchange Format (LDIF) format as a complement to the old schema previously accepted by OpenLDAP. - With this update, the user can selectively disable the Generic Security Services API (GSSAPI) key exchange algorithms as any normal key exchange.
    last seen 2019-02-21
    modified 2018-12-28
    plugin id 87567
    published 2015-12-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=87567
    title Scientific Linux Security Update : openssh on SL7.x x86_64
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1581-1.NASL
    description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 86057
    published 2015-09-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86057
    title SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1581-1) (Logjam)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1547-2.NASL
    description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 85941
    published 2015-09-15
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85941
    title SUSE SLED11 Security Update : openssh (SUSE-SU-2015:1547-2) (Logjam)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1544-1.NASL
    description openssh was updated to fix several security issues. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. (bsc#943010) - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. (bsc#943006) Also use %restart_on_update in the trigger script. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 85928
    published 2015-09-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85928
    title SUSE SLED12 / SLES12 Security Update : openssh (SUSE-SU-2015:1544-1) (Logjam)
  • NASL family Misc.
    NASL id OPENSSH_70.NASL
    description According to its banner, the version of OpenSSH running on the remote host is prior to 7.0. It is, therefore, affected by the following vulnerabilities : - A security bypass vulnerability exists in the kbdint_next_device() function in file auth2-chall.c that allows the circumvention of MaxAuthTries during keyboard-interactive authentication. A remote attacker can exploit this issue to force the same authentication method to be tried thousands of times in a single pass by using a crafted keyboard-interactive 'devices' string, thus allowing a brute-force attack or causing a denial of service. (CVE-2015-5600) - A security bypass vulnerability exists in sshd due to improper handling of username data in MONITOR_REQ_PAM_INIT_CTX requests. A local attacker can exploit this, by sending a MONITOR_REQ_PWNAM request, to conduct an impersonation attack. Note that this issue only affects Portable OpenSSH. (CVE-2015-6563) - A privilege escalation vulnerability exists due to a use-after-free error in sshd that is triggered when handling a MONITOR_REQ_PAM_FREE_CTX request. A local attacker can exploit this to gain elevated privileges. Note that this issue only affects Portable OpenSSH. (CVE-2015-6564) - A local command execution vulnerability exists in sshd due to setting insecure world-writable permissions for TTYs. A local attacker can exploit this, by injecting crafted terminal escape sequences, to execute commands for logged-in users. (CVE-2015-6565)
    last seen 2019-02-21
    modified 2018-07-16
    plugin id 85382
    published 2015-08-13
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85382
    title OpenSSH < 7.0 Multiple Vulnerabilities
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-2710-1.NASL
    description Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to perform user impersonation. (CVE number pending) Moritz Jodeit discovered that OpenSSH incorrectly handled context memory when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to bypass authentication or possibly execute arbitrary code. (CVE number pending) Jann Horn discovered that OpenSSH incorrectly handled time windows for X connections. A remote attacker could use this issue to bypass certain access restrictions. (CVE-2015-5352) It was discovered that OpenSSH incorrectly handled keyboard-interactive authentication. In a non-default configuration, a remote attacker could possibly use this issue to perform a brute-force password attack. (CVE-2015-5600). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-12-01
    plugin id 85445
    published 2015-08-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85445
    title Ubuntu 12.04 LTS / 14.04 LTS / 15.04 : openssh vulnerabilities (USN-2710-1)
  • NASL family CentOS Local Security Checks
    NASL id CENTOS_RHSA-2016-0466.NASL
    description Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. (CVE-2016-3115) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 90069
    published 2016-03-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90069
    title CentOS 6 : openssh (CESA-2016:0466)
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2015-2088.NASL
    description From Red Hat Security Advisory 2015:2088 : Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) It was found that the OpenSSH ssh-agent, a program to hold private keys used for public key authentication, was vulnerable to password guessing attacks. An attacker able to connect to the agent could use this flaw to conduct a brute-force attack to unlock keys in the ssh-agent. (BZ#1238238) This update fixes the following bugs : * Previously, the sshd_config(5) man page was misleading and could thus confuse the user. This update improves the man page text to clearly describe the AllowGroups feature. (BZ#1150007) * The limit for the function for restricting the number of files listed using the wildcard character (*) that prevents the Denial of Service (DoS) for both server and client was previously set too low. Consequently, the user reaching the limit was prevented from listing a directory with a large number of files over Secure File Transfer Protocol (SFTP). This update increases the aforementioned limit, thus fixing this bug. (BZ#1160377) * When the ForceCommand option with a pseudoterminal was used and the MaxSession option was set to '2', multiplexed SSH connections did not work as expected. After the user attempted to open a second multiplexed connection, the attempt failed if the first connection was still open. This update modifies OpenSSH to issue only one audit message per session, and the user is thus able to open two multiplexed connections in this situation. (BZ#1199112) * The ssh-copy-id utility failed if the account on the remote server did not use an sh-like shell. Remote commands have been modified to run in an sh-like shell, and ssh-copy-id now works also with non-sh-like shells. (BZ#1201758) * Due to a race condition between auditing messages and answers when using ControlMaster multiplexing, one session in the shared connection randomly and unexpectedly exited the connection. This update fixes the race condition in the auditing code, and multiplexing connections now work as expected even with a number of sessions created at once. (BZ#1240613) In addition, this update adds the following enhancements : * As not all Lightweight Directory Access Protocol (LDAP) servers possess a default schema, as expected by the ssh-ldap-helper program, this update provides the user with an ability to adjust the LDAP query to get public keys from servers with a different schema, while the default functionality stays untouched. (BZ#1201753) * With this enhancement update, the administrator is able to set permissions for files uploaded using Secure File Transfer Protocol (SFTP). (BZ#1197989) * This update provides the LDAP schema in LDAP Data Interchange Format (LDIF) format as a complement to the old schema previously accepted by OpenLDAP. (BZ#1184938) * With this update, the user can selectively disable the Generic Security Services API (GSSAPI) key exchange algorithms as any normal key exchange. (BZ#1253062) Users of openssh are advised to upgrade to these updated packages, which correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-07-24
    plugin id 87019
    published 2015-11-24
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=87019
    title Oracle Linux 7 : openssh (ELSA-2015-2088)
  • NASL family OracleVM Local Security Checks
    NASL id ORACLEVM_OVMSA-2016-0070.NASL
    description The remote OracleVM system is missing necessary patches to address critical security updates : - CVE-2015-5600: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices (John Haxby) [orabug 22985024] - CVE-2016-3115: missing sanitisation of input for X11 forwarding (John Haxby) [orabug 22985024]
    last seen 2019-02-21
    modified 2018-07-24
    plugin id 91750
    published 2016-06-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=91750
    title OracleVM 3.2 : openssh (OVMSA-2016-0070)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20160321_OPENSSH_ON_SL6_X.NASL
    description It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. (CVE-2016-3115) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
    last seen 2019-02-21
    modified 2018-12-28
    plugin id 90080
    published 2016-03-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=90080
    title Scientific Linux Security Update : openssh on SL6.x i386/x86_64
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1695-1.NASL
    description OpenSSH was updated to fix several security issues and bugs. Please note that due to a bug in the previous shipped openssh version, sshd might not correctly restart. Please verify that the ssh daemon is running after installing this update. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function, when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window. (bsc#936695) - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. (bsc#938746) - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM. (bsc#932483) - Hardening patch to fix sftp RCE. (bsc#903649) - CVE-2015-6563: The monitor component in sshd accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. Additional a bug was fixed that could lead to openssh not working in chroot (bsc#947458). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 86339
    published 2015-10-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86339
    title SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1695-1) (Logjam)
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-2710-2.NASL
    description USN-2710-1 fixed vulnerabilities in OpenSSH. The upstream fix for CVE-2015-5600 caused a regression resulting in random authentication failures in non-default configurations. This update fixes the problem. Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to perform user impersonation. (CVE number pending) Moritz Jodeit discovered that OpenSSH incorrectly handled context memory when using PAM authentication. If an additional vulnerability were discovered in the OpenSSH unprivileged child process, this issue could allow a remote attacker to bypass authentication or possibly execute arbitrary code. (CVE number pending) Jann Horn discovered that OpenSSH incorrectly handled time windows for X connections. A remote attacker could use this issue to bypass certain access restrictions. (CVE-2015-5352) It was discovered that OpenSSH incorrectly handled keyboard-interactive authentication. In a non-default configuration, a remote attacker could possibly use this issue to perform a brute-force password attack. (CVE-2015-5600). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-12-01
    plugin id 85533
    published 2015-08-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85533
    title Ubuntu 12.04 LTS / 14.04 LTS / 15.04 : openssh regression (USN-2710-2)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1547-1.NASL
    description openssh was updated to fix several security issues and bugs. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). - CVE-2015-6563: The monitor component in sshd in OpenSSH accepted extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allowed local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c. - CVE-2015-6564: Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH might have allowed local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request. The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 85929
    published 2015-09-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85929
    title SUSE SLES11 Security Update : openssh (SUSE-SU-2015:1547-1) (Logjam)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2015-11981.NASL
    description Security fix for CVE-2015-5600 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2015-10-19
    plugin id 85133
    published 2015-07-31
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85133
    title Fedora 22 : openssh-6.9p1-3.fc22 (2015-11981)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2015-1840-1.NASL
    description openssh was updated to fix four security issues. These security issues were fixed : - CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695). - CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746). - CVE-2015-4000: Removed and disabled weak DH groups (bsc#932483). - Hardening patch to fix sftp RCE (bsc#903649). The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 86695
    published 2015-11-02
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86695
    title SUSE SLES11 Security Update : openssh (SUSE-SU-2015:1840-1) (Logjam)
  • NASL family FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_5B74A5BC348F11E5BA05C80AA9043978.NASL
    description It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks.
    last seen 2019-02-21
    modified 2018-11-21
    plugin id 85033
    published 2015-07-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85033
    title FreeBSD : OpenSSH -- MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices (5b74a5bc-348f-11e5-ba05-c80aa9043978)
  • NASL family F5 Networks Local Security Checks
    NASL id F5_BIGIP_SOL17113.NASL
    description The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list. (CVE-2015-5600)
    last seen 2019-02-21
    modified 2019-01-04
    plugin id 88812
    published 2016-02-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88812
    title F5 Networks BIG-IP : OpenSSH vulnerability (K17113)
  • NASL family CentOS Local Security Checks
    NASL id CENTOS_RHSA-2015-2088.NASL
    description Updated openssh packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users. (CVE-2015-6563) A use-after-free flaw was found in OpenSSH. An attacker able to fully compromise a non-privileged pre-authentication process using a different flaw could possibly cause sshd to crash or execute arbitrary code with root privileges. (CVE-2015-6564) It was discovered that the OpenSSH sshd daemon did not check the list of keyboard-interactive authentication methods for duplicates. A remote attacker could use this flaw to bypass the MaxAuthTries limit, making it easier to perform password guessing attacks. (CVE-2015-5600) It was found that the OpenSSH ssh-agent, a program to hold private keys used for public key authentication, was vulnerable to password guessing attacks. An attacker able to connect to the agent could use this flaw to conduct a brute-force attack to unlock keys in the ssh-agent. (BZ#1238238) This update fixes the following bugs : * Previously, the sshd_config(5) man page was misleading and could thus confuse the user. This update improves the man page text to clearly describe the AllowGroups feature. (BZ#1150007) * The limit for the function for restricting the number of files listed using the wildcard character (*) that prevents the Denial of Service (DoS) for both server and client was previously set too low. Consequently, the user reaching the limit was prevented from listing a directory with a large number of files over Secure File Transfer Protocol (SFTP). This update increases the aforementioned limit, thus fixing this bug. (BZ#1160377) * When the ForceCommand option with a pseudoterminal was used and the MaxSession option was set to '2', multiplexed SSH connections did not work as expected. After the user attempted to open a second multiplexed connection, the attempt failed if the first connection was still open. This update modifies OpenSSH to issue only one audit message per session, and the user is thus able to open two multiplexed connections in this situation. (BZ#1199112) * The ssh-copy-id utility failed if the account on the remote server did not use an sh-like shell. Remote commands have been modified to run in an sh-like shell, and ssh-copy-id now works also with non-sh-like shells. (BZ#1201758) * Due to a race condition between auditing messages and answers when using ControlMaster multiplexing, one session in the shared connection randomly and unexpectedly exited the connection. This update fixes the race condition in the auditing code, and multiplexing connections now work as expected even with a number of sessions created at once. (BZ#1240613) In addition, this update adds the following enhancements : * As not all Lightweight Directory Access Protocol (LDAP) servers possess a default schema, as expected by the ssh-ldap-helper program, this update provides the user with an ability to adjust the LDAP query to get public keys from servers with a different schema, while the default functionality stays untouched. (BZ#1201753) * With this enhancement update, the administrator is able to set permissions for files uploaded using Secure File Transfer Protocol (SFTP). (BZ#1197989) * This update provides the LDAP schema in LDAP Data Interchange Format (LDIF) format as a complement to the old schema previously accepted by OpenLDAP. (BZ#1184938) * With this update, the user can selectively disable the Generic Security Services API (GSSAPI) key exchange algorithms as any normal key exchange. (BZ#1253062) Users of openssh are advised to upgrade to these updated packages, which correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 87128
    published 2015-12-02
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=87128
    title CentOS 7 : openssh (CESA-2015:2088)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DLA-288.NASL
    description In Debian LTS (squeeze), the fix for CVE-2015-5600[1] in openssh 1:5.5p1-6+squeeze7 breaks authentication mechanisms that rely on the keyboard-interactive method. Thanks to Colin Watson for making aware of that. The patch fixing CVE-2015-5600 introduces the field 'devices_done' to the KbdintAuthctxt struct, but does not initialize the field in the kbdint_alloc() function. On Linux, this ends up filling that field with junk data. The result of this are random login failures when keyboard-interactive authentication is used. This upload of openssh 1:5.5p1-6+squeeze7 to Debian LTS (squeeze) adds that initialization of the `devices_done` field alongside the existing initialization code. People relying on keyboard-interactive based authentication mechanisms with OpenSSH on Debian squeeze(-lts) systems are recommended to upgrade OpenSSH to 1:5.5p1-6+squeeze7. [1] https://lists.debian.org/debian-lts-announce/2015/08/msg00001.html NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-07-06
    plugin id 85278
    published 2015-08-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85278
    title Debian DLA-288-2 : openssh regression update
  • NASL family Firewalls
    NASL id PFSENSE_SA-15_08.NASL
    description According to its self-reported version number, the remote pfSense install is prior to 2.2.5. It is, therefore, affected by multiple vulnerabilities as stated in the referenced vendor advisories.
    last seen 2019-02-21
    modified 2018-07-24
    plugin id 106497
    published 2018-01-31
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=106497
    title pfSense < 2.2.5 Multiple Vulnerabilities (SA-15_08)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2015-13469.NASL
    description This update provides fixes for vulnerabilities published with openssh-7.0 Security fix for CVE-2015-5600 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2015-10-19
    plugin id 85668
    published 2015-08-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=85668
    title Fedora 21 : openssh-6.6.1p1-16.fc21 (2015-13469)
redhat via4
advisories
rhsa
id RHSA-2016:0466
rpms
  • openssh-0:6.6.1p1-22.el7
  • openssh-askpass-0:6.6.1p1-22.el7
  • openssh-clients-0:6.6.1p1-22.el7
  • openssh-keycat-0:6.6.1p1-22.el7
  • openssh-ldap-0:6.6.1p1-22.el7
  • openssh-server-0:6.6.1p1-22.el7
  • openssh-server-sysvinit-0:6.6.1p1-22.el7
  • pam_ssh_agent_auth-0:0.9.3-9.22.el7
  • openssh-0:5.3p1-114.el6_7
  • openssh-askpass-0:5.3p1-114.el6_7
  • openssh-clients-0:5.3p1-114.el6_7
  • openssh-ldap-0:5.3p1-114.el6_7
  • openssh-server-0:5.3p1-114.el6_7
  • pam_ssh_agent_auth-0:0.9.3-114.el6_7
refmap via4
apple APPLE-SA-2015-08-13-2
bid
  • 75990
  • 91787
  • 92012
confirm
fedora
  • FEDORA-2015-11981
  • FEDORA-2015-13469
fulldisc 20150717 OpenSSH keyboard-interactive authentication brute force vulnerability (MaxAuthTries bypass)
gentoo GLSA-201512-04
mlist
  • [debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security update
  • [oss-security] 20150723 Re: CVE Request for OpenSSH vulnerability - authentication limits bypass
sectrack 1032988
suse SUSE-SU-2015:1581
ubuntu
  • USN-2710-1
  • USN-2710-2
Last major update 23-12-2016 - 21:59
Published 02-08-2015 - 21:59
Last modified 11-09-2018 - 06:29
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