ID CVE-2014-2532
Summary sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character.
References
Vulnerable Configurations
  • Oracle Communications User Data Repository 10.0.1
    cpe:2.3:a:oracle:communications_user_data_repository:10.0.1
  • OpenBSD OpenSSH 6.0
    cpe:2.3:a:openbsd:openssh:6.0
  • OpenBSD OpenSSH 6.1
    cpe:2.3:a:openbsd:openssh:6.1
  • OpenBSD OpenSSH 6.2
    cpe:2.3:a:openbsd:openssh:6.2
  • OpenBSD OpenSSH 6.3
    cpe:2.3:a:openbsd:openssh:6.3
  • OpenBSD OpenSSH 6.4
    cpe:2.3:a:openbsd:openssh:6.4
  • OpenBSD OpenSSH 6.5
    cpe:2.3:a:openbsd:openssh:6.5
CVSS
Base: 5.8 (as of 25-04-2016 - 13:57)
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 MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL NONE
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 Slackware Local Security Checks
    NASL id SLACKWARE_SSA_2014-086-06.NASL
    description New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.
    last seen 2019-02-21
    modified 2016-12-09
    plugin id 73252
    published 2014-03-31
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73252
    title Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : openssh (SSA:2014-086-06)
  • NASL family MacOS X Local Security Checks
    NASL id MACOSX_10_11.NASL
    description The remote host is running a version of Mac OS X that is 10.6.8 or later but prior to 10.11. It is, therefore, affected by multiple vulnerabilities in the following components : - Address Book - AirScan - apache_mod_php - Apple Online Store Kit - AppleEvents - Audio - bash - Certificate Trust Policy - CFNetwork Cookies - CFNetwork FTPProtocol - CFNetwork HTTPProtocol - CFNetwork Proxies - CFNetwork SSL - CoreCrypto - CoreText - Dev Tools - Disk Images - dyld - EFI - Finder - Game Center - Heimdal - ICU - Install Framework Legacy - Intel Graphics Driver - IOAudioFamily - IOGraphics - IOHIDFamily - IOStorageFamily - Kernel - libc - libpthread - libxpc - Login Window - lukemftpd - Mail - Multipeer Connectivity - NetworkExtension - Notes - OpenSSH - OpenSSL - procmail - remote_cmds - removefile - Ruby - Safari - Safari Downloads - Safari Extensions - Safari Safe Browsing - Security - SMB - SQLite - Telephony - Terminal - tidy - Time Machine - WebKit - WebKit CSS - WebKit JavaScript Bindings - WebKit Page Loading - WebKit Plug-ins Note that successful exploitation of the most serious issues can result in arbitrary code execution.
    last seen 2019-02-21
    modified 2018-07-14
    plugin id 86270
    published 2015-10-05
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=86270
    title Mac OS X < 10.11 Multiple Vulnerabilities (GHOST)
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-2155-1.NASL
    description Jann Horn discovered that OpenSSH incorrectly handled wildcards in AcceptEnv lines. A remote attacker could use this issue to possibly bypass certain intended environment variable restrictions. 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 73202
    published 2014-03-26
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73202
    title Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.10 : openssh vulnerability (USN-2155-1)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_11_OPENSSH-140607.NASL
    description This update for OpenSSH fixes the following issues : - Exit sshd normally when port is already in use. (bnc#832628) - Use hardware crypto engines where available. (bnc#826427) - Use correct options for login when it is used. (bnc#833605) - Move FIPS messages to higher debug level. (bnc#862875) - Fix forwarding with IPv6 addresses in DISPLAY. (bnc#847710) - Do not link OpenSSH binaries with LDAP libraries. (bnc#826906) - Parse AcceptEnv properly. (bnc#869101, CVE-2014-2532) - Check SSHFP DNS records even for server certificates. (bnc#870532, CVE-2014-2653)
    last seen 2018-09-02
    modified 2015-10-05
    plugin id 76141
    published 2014-06-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=76141
    title SuSE 11.3 Security Update : openssh (SAT Patch Number 9357)
  • NASL family Mandriva Local Security Checks
    NASL id MANDRIVA_MDVSA-2015-095.NASL
    description Updated openssh packages fix security vulnerabilities : sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character (CVE-2014-2532). Matthew Vernon reported that if a SSH server offers a HostCertificate that the ssh client doesn't accept, then the client doesn't check the DNS for SSHFP records. As a consequence a malicious server can disable SSHFP-checking by presenting a certificate (CVE-2014-2653).
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 82348
    published 2015-03-30
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=82348
    title Mandriva Linux Security Advisory : openssh (MDVSA-2015:095)
  • NASL family F5 Networks Local Security Checks
    NASL id F5_BIGIP_SOL15780.NASL
    description CVE-2014-2653 The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate. CVE-2014-2532 sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character.
    last seen 2019-02-21
    modified 2019-01-04
    plugin id 91617
    published 2016-06-15
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=91617
    title F5 Networks BIG-IP : OpenSSH vulnerabilities (K15780)
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2014-1552.NASL
    description Updated openssh packages that fix two security issues, several bugs, and add various enhancements 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 OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653) It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions. (CVE-2014-2532) This update also fixes the following bugs : * Based on the SP800-131A information security standard, the generation of a digital signature using the Digital Signature Algorithm (DSA) with the key size of 1024 bits and RSA with the key size of less than 2048 bits is disallowed after the year 2013. After this update, ssh-keygen no longer generates keys with less than 2048 bits in FIPS mode. However, the sshd service accepts keys of size 1024 bits as well as larger keys for compatibility reasons. (BZ#993580) * Previously, the openssh utility incorrectly set the oom_adj value to -17 for all of its children processes. This behavior was incorrect because the children processes were supposed to have this value set to 0. This update applies a patch to fix this bug and oom_adj is now properly set to 0 for all children processes as expected. (BZ#1010429) * Previously, if the sshd service failed to verify the checksum of an installed FIPS module using the fipscheck library, the information about this failure was only provided at the standard error output of sshd. As a consequence, the user could not notice this message and be uninformed when a system had not been properly configured for FIPS mode. To fix this bug, this behavior has been changed and sshd now sends such messages via the syslog service. (BZ#1020803) * When keys provided by the pkcs11 library were removed from the ssh agent using the 'ssh-add -e' command, the user was prompted to enter a PIN. With this update, a patch has been applied to allow the user to remove the keys provided by pkcs11 without the PIN. (BZ#1042519) In addition, this update adds the following enhancements : * With this update, ControlPersist has been added to OpenSSH. The option in conjunction with the ControlMaster configuration directive specifies that the master connection remains open in the background after the initial client connection has been closed. (BZ#953088) * When the sshd daemon is configured to force the internal SFTP session, and the user attempts to use a connection other than SFTP, the appropriate message is logged to the /var/log/secure file. (BZ#997377) * Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and host user keys (ECDSA) as specified by RFC5656 has been added to the openssh packages. However, they are not enabled by default and the user has to enable them manually. For more information on how to configure ECDSA and ECDH with OpenSSH, see: https://access.redhat.com/solutions/711953 (BZ#1028335) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 78413
    published 2014-10-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=78413
    title RHEL 6 : openssh (RHSA-2014:1552)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-2894.NASL
    description Two vulnerabilities were discovered in OpenSSH, an implementation of the SSH protocol suite. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2014-2532 Jann Horn discovered that OpenSSH incorrectly handled wildcards in AcceptEnv lines. A remote attacker could use this issue to trick OpenSSH into accepting any environment variable that contains the characters before the wildcard character. - CVE-2014-2653 Matthew Vernon reported that if a SSH server offers a HostCertificate that the ssh client doesn't accept, then the client doesn't check the DNS for SSHFP records. As a consequence a malicious server can disable SSHFP-checking by presenting a certificate. Note that a host verification prompt is still displayed before connecting.
    last seen 2019-02-21
    modified 2018-11-28
    plugin id 73350
    published 2014-04-07
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73350
    title Debian DSA-2894-1 : openssh - security update
  • NASL family AIX Local Security Checks
    NASL id AIX_OPENSSH_ADVISORY4.NASL
    description The version of OpenSSH running on the remote host is affected by multiple security bypass vulnerabilities : - sshd in OpenSSH versions before 6.6 do not properly support wildcards on AcceptEnv lines in sshd_config, which allow a remote attacker to bypass intended environment restrictions by using a substring located before a wildcard character. (CVE-2014-2532) - The verify_host_key function in sshconnect.c in the OpenSSH client for versions 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS checking by presenting an unacceptable HostCertificate. (CVE-2014-2653)
    last seen 2019-02-21
    modified 2018-11-28
    plugin id 76168
    published 2014-06-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=76168
    title AIX OpenSSH Vulnerability : openssh_advisory4.asc
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2014-1552.NASL
    description From Red Hat Security Advisory 2014:1552 : Updated openssh packages that fix two security issues, several bugs, and add various enhancements 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 OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653) It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions. (CVE-2014-2532) This update also fixes the following bugs : * Based on the SP800-131A information security standard, the generation of a digital signature using the Digital Signature Algorithm (DSA) with the key size of 1024 bits and RSA with the key size of less than 2048 bits is disallowed after the year 2013. After this update, ssh-keygen no longer generates keys with less than 2048 bits in FIPS mode. However, the sshd service accepts keys of size 1024 bits as well as larger keys for compatibility reasons. (BZ#993580) * Previously, the openssh utility incorrectly set the oom_adj value to -17 for all of its children processes. This behavior was incorrect because the children processes were supposed to have this value set to 0. This update applies a patch to fix this bug and oom_adj is now properly set to 0 for all children processes as expected. (BZ#1010429) * Previously, if the sshd service failed to verify the checksum of an installed FIPS module using the fipscheck library, the information about this failure was only provided at the standard error output of sshd. As a consequence, the user could not notice this message and be uninformed when a system had not been properly configured for FIPS mode. To fix this bug, this behavior has been changed and sshd now sends such messages via the syslog service. (BZ#1020803) * When keys provided by the pkcs11 library were removed from the ssh agent using the 'ssh-add -e' command, the user was prompted to enter a PIN. With this update, a patch has been applied to allow the user to remove the keys provided by pkcs11 without the PIN. (BZ#1042519) In addition, this update adds the following enhancements : * With this update, ControlPersist has been added to OpenSSH. The option in conjunction with the ControlMaster configuration directive specifies that the master connection remains open in the background after the initial client connection has been closed. (BZ#953088) * When the sshd daemon is configured to force the internal SFTP session, and the user attempts to use a connection other than SFTP, the appropriate message is logged to the /var/log/secure file. (BZ#997377) * Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and host user keys (ECDSA) as specified by RFC5656 has been added to the openssh packages. However, they are not enabled by default and the user has to enable them manually. For more information on how to configure ECDSA and ECDH with OpenSSH, see: https://access.redhat.com/solutions/711953 (BZ#1028335) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-07-18
    plugin id 78526
    published 2014-10-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=78526
    title Oracle Linux 6 : openssh (ELSA-2014-1552)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2014-6380.NASL
    description - environment variables with embedded '=' or '\0' characters are now ignored - prevents a server from skipping SSHFP lookup and forcing a new-hostkey dialog by offering only certificate keys - ssh-agent is now suspend-aware as it gets also CLOCK_BOOTTIME time - /etc/ssh/moduli is readable by all now - sshd-keygen.service depends on existence of /etc/ssh/ssh_host_ecdsa_key instead of /etc/ssh/ssh_host_dsa_key by default - ssh-copy-id is run in so called legacy mode when SSH_COPY_ID_LEGACY variable is set 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 2018-12-05
    plugin id 74133
    published 2014-05-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=74133
    title Fedora 20 : openssh-6.4p1-4.fc20 (2014-6380)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_11_OPENSSH-140606.NASL
    description This update for OpenSSH fixes the following issues : - Exit sshd normally when port is already in use. (bnc#832628) - Use hardware crypto engines where available. (bnc#826427) - Use correct options for login when it is used. (bnc#833605) - Move FIPS messages to higher debug level. (bnc#862875) - Fix forwarding with IPv6 addresses in DISPLAY. (bnc#847710) - Do not link OpenSSH binaries with LDAP libraries. (bnc#826906) - Parse AcceptEnv properly. (bnc#869101, CVE-2014-2532) - Check SSHFP DNS records even for server certificates. (bnc#870532, CVE-2014-2653)
    last seen 2018-09-01
    modified 2015-10-05
    plugin id 76140
    published 2014-06-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=76140
    title SuSE 11.3 Security Update : openssh (SAT Patch Number 9357)
  • NASL family Mandriva Local Security Checks
    NASL id MANDRIVA_MDVSA-2014-068.NASL
    description Updated openssh packages fixes security vulnerabilities : sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character (CVE-2014-2532). Matthew Vernon reported that if a SSH server offers a HostCertificate that the ssh client doesn't accept, then the client doesn't check the DNS for SSHFP records. As a consequence a malicious server can disable SSHFP-checking by presenting a certificate (CVE-2014-2653).
    last seen 2019-02-21
    modified 2019-01-02
    plugin id 73444
    published 2014-04-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73444
    title Mandriva Linux Security Advisory : openssh (MDVSA-2014:068)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20141014_OPENSSH_ON_SL6_X.NASL
    description It was discovered that OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653) It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions. (CVE-2014-2532) This update also fixes the following bugs : - Based on the SP800-131A information security standard, the generation of a digital signature using the Digital Signature Algorithm (DSA) with the key size of 1024 bits and RSA with the key size of less than 2048 bits is disallowed after the year 2013. After this update, ssh-keygen no longer generates keys with less than 2048 bits in FIPS mode. However, the sshd service accepts keys of size 1024 bits as well as larger keys for compatibility reasons. - Previously, the openssh utility incorrectly set the oom_adj value to -17 for all of its children processes. This behavior was incorrect because the children processes were supposed to have this value set to 0. This update applies a patch to fix this bug and oom_adj is now properly set to 0 for all children processes as expected. - Previously, if the sshd service failed to verify the checksum of an installed FIPS module using the fipscheck library, the information about this failure was only provided at the standard error output of sshd. As a consequence, the user could not notice this message and be uninformed when a system had not been properly configured for FIPS mode. To fix this bug, this behavior has been changed and sshd now sends such messages via the syslog service. - When keys provided by the pkcs11 library were removed from the ssh agent using the 'ssh-add -e' command, the user was prompted to enter a PIN. With this update, a patch has been applied to allow the user to remove the keys provided by pkcs11 without the PIN. In addition, this update adds the following enhancements : - With this update, ControlPersist has been added to OpenSSH. The option in conjunction with the ControlMaster configuration directive specifies that the master connection remains open in the background after the initial client connection has been closed. - When the sshd daemon is configured to force the internal SFTP session, and the user attempts to use a connection other than SFTP, the appropriate message is logged to the /var/log/secure file. - Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and host user keys (ECDSA) as specified by RFC5656 has been added to the openssh packages. However, they are not enabled by default and the user has to enable them manually.
    last seen 2019-02-21
    modified 2018-12-28
    plugin id 78641
    published 2014-10-23
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=78641
    title Scientific Linux Security Update : openssh on SL6.x i386/x86_64
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2014-6569.NASL
    description - environment variables with embedded '=' or '0' characters are now ignored - prevents a server from skipping SSHFP lookup and forcing a new-hostkey dialog by offering only certificate keys - /etc/ssh/moduli is readable by all now - ssh-copy-id is run in so called legacy mode when SSH_COPY_ID_LEGACY variable is set 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 2018-12-05
    plugin id 74384
    published 2014-06-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=74384
    title Fedora 19 : openssh-6.2p2-8.fc19 (2014-6569)
  • NASL family Misc.
    NASL id OPENSSH_66.NASL
    description According to its banner, the version of OpenSSH running on the remote host is prior to 6.6. It is, therefore, affected by the following vulnerabilities : - A flaw exists due to a failure to initialize certain data structures when makefile.inc is modified to enable the J-PAKE protocol. An unauthenticated, remote attacker can exploit this to corrupt memory, resulting in a denial of service condition and potentially the execution of arbitrary code. (CVE-2014-1692) - An error exists related to the 'AcceptEnv' configuration setting in sshd_config due to improper processing of wildcard characters. An unauthenticated, remote attacker can exploit this, via a specially crafted request, to bypass intended environment restrictions. (CVE-2014-2532) Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
    last seen 2019-02-21
    modified 2018-11-15
    plugin id 73079
    published 2014-03-18
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73079
    title OpenSSH < 6.6 Multiple Vulnerabilities
  • NASL family CentOS Local Security Checks
    NASL id CENTOS_RHSA-2014-1552.NASL
    description Updated openssh packages that fix two security issues, several bugs, and add various enhancements 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 OpenSSH clients did not correctly verify DNS SSHFP records. A malicious server could use this flaw to force a connecting client to skip the DNS SSHFP record check and require the user to perform manual host verification of the DNS SSHFP record. (CVE-2014-2653) It was found that OpenSSH did not properly handle certain AcceptEnv parameter values with wildcard characters. A remote attacker could use this flaw to bypass intended environment variable restrictions. (CVE-2014-2532) This update also fixes the following bugs : * Based on the SP800-131A information security standard, the generation of a digital signature using the Digital Signature Algorithm (DSA) with the key size of 1024 bits and RSA with the key size of less than 2048 bits is disallowed after the year 2013. After this update, ssh-keygen no longer generates keys with less than 2048 bits in FIPS mode. However, the sshd service accepts keys of size 1024 bits as well as larger keys for compatibility reasons. (BZ#993580) * Previously, the openssh utility incorrectly set the oom_adj value to -17 for all of its children processes. This behavior was incorrect because the children processes were supposed to have this value set to 0. This update applies a patch to fix this bug and oom_adj is now properly set to 0 for all children processes as expected. (BZ#1010429) * Previously, if the sshd service failed to verify the checksum of an installed FIPS module using the fipscheck library, the information about this failure was only provided at the standard error output of sshd. As a consequence, the user could not notice this message and be uninformed when a system had not been properly configured for FIPS mode. To fix this bug, this behavior has been changed and sshd now sends such messages via the syslog service. (BZ#1020803) * When keys provided by the pkcs11 library were removed from the ssh agent using the 'ssh-add -e' command, the user was prompted to enter a PIN. With this update, a patch has been applied to allow the user to remove the keys provided by pkcs11 without the PIN. (BZ#1042519) In addition, this update adds the following enhancements : * With this update, ControlPersist has been added to OpenSSH. The option in conjunction with the ControlMaster configuration directive specifies that the master connection remains open in the background after the initial client connection has been closed. (BZ#953088) * When the sshd daemon is configured to force the internal SFTP session, and the user attempts to use a connection other than SFTP, the appropriate message is logged to the /var/log/secure file. (BZ#997377) * Support for Elliptic Curve Cryptography modes for key exchange (ECDH) and host user keys (ECDSA) as specified by RFC5656 has been added to the openssh packages. However, they are not enabled by default and the user has to enable them manually. For more information on how to configure ECDSA and ECDH with OpenSSH, see: https://access.redhat.com/solutions/711953 (BZ#1028335) All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 79184
    published 2014-11-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=79184
    title CentOS 6 : openssh (CESA-2014:1552)
  • NASL family Amazon Linux Local Security Checks
    NASL id ALA_ALAS-2014-369.NASL
    description sshd in OpenSSH before 6.6 does not properly support wildcards on AcceptEnv lines in sshd_config, which allows remote attackers to bypass intended environment restrictions by using a substring located before a wildcard character. The verify_host_key function in sshconnect.c in the client in OpenSSH 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS RR checking by presenting an unacceptable HostCertificate.
    last seen 2019-02-21
    modified 2018-04-18
    plugin id 78312
    published 2014-10-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=78312
    title Amazon Linux AMI : openssh (ALAS-2014-369)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201405-06.NASL
    description The remote host is affected by the vulnerability described in GLSA-201405-06 (OpenSSH: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in OpenSSH. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could execute arbitrary code, cause a Denial of Service condition, obtain sensitive information, or bypass environment restrictions. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2018-07-13
    plugin id 73958
    published 2014-05-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=73958
    title GLSA-201405-06 : OpenSSH: Multiple vulnerabilities
redhat via4
advisories
rhsa
id RHSA-2014:1552
rpms
  • openssh-0:5.3p1-104.el6
  • openssh-askpass-0:5.3p1-104.el6
  • openssh-clients-0:5.3p1-104.el6
  • openssh-ldap-0:5.3p1-104.el6
  • openssh-server-0:5.3p1-104.el6
  • pam_ssh_agent_auth-0:0.9.3-104.el6
refmap via4
apple APPLE-SA-2015-09-30-3
bid 66355
confirm
debian DSA-2894
fedora
  • FEDORA-2014-6380
  • FEDORA-2014-6569
hp
  • HPSBUX03188
  • SSRT101487
mandriva
  • MDVSA-2014:068
  • MDVSA-2015:095
mlist [security-announce] 20140315 Announce: OpenSSH 6.6 released
sectrack 1029925
secunia
  • 57488
  • 57574
  • 59313
  • 59855
ubuntu USN-2155-1
xf openssh-cve20142532-sec-bypass(91986)
Last major update 06-01-2017 - 21:59
Published 18-03-2014 - 01:18
Last modified 18-07-2018 - 21:29
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