ID CVE-2018-15473
Summary OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.
References
Vulnerable Configurations
  • OpenBSD OpenSSH
    cpe:2.3:a:openbsd:openssh
  • OpenBSD OpenSSH 1.2
    cpe:2.3:a:openbsd:openssh:1.2
  • OpenBSD OpenSSH 1.2.1
    cpe:2.3:a:openbsd:openssh:1.2.1
  • OpenBSD OpenSSH 1.2.2
    cpe:2.3:a:openbsd:openssh:1.2.2
  • OpenBSD OpenSSH 1.2.3
    cpe:2.3:a:openbsd:openssh:1.2.3
  • OpenBSD OpenSSH 1.2.27
    cpe:2.3:a:openbsd:openssh:1.2.27
  • OpenBSD OpenSSH 1.3
    cpe:2.3:a:openbsd:openssh:1.3
  • OpenBSD OpenSSH 1.5
    cpe:2.3:a:openbsd:openssh:1.5
  • OpenBSD OpenSSH 1.5.7
    cpe:2.3:a:openbsd:openssh:1.5.7
  • OpenBSD OpenSSH 1.5.8
    cpe:2.3:a:openbsd:openssh:1.5.8
  • OpenBSD OpenSSH 2
    cpe:2.3:a:openbsd:openssh:2
  • OpenBSD OpenSSH 2.1
    cpe:2.3:a:openbsd:openssh:2.1
  • OpenBSD OpenSSH 2.1.1
    cpe:2.3:a:openbsd:openssh:2.1.1
  • OpenBSD OpenSSH 2.2
    cpe:2.3:a:openbsd:openssh:2.2
  • OpenBSD OpenSSH 2.3
    cpe:2.3:a:openbsd:openssh:2.3
  • OpenBSD OpenSSH 2.3.1
    cpe:2.3:a:openbsd:openssh:2.3.1
  • OpenBSD OpenSSH 2.5
    cpe:2.3:a:openbsd:openssh:2.5
  • OpenBSD OpenSSH 2.5.1
    cpe:2.3:a:openbsd:openssh:2.5.1
  • OpenBSD OpenSSH 2.5.2
    cpe:2.3:a:openbsd:openssh:2.5.2
  • OpenBSD OpenSSH 2.9
    cpe:2.3:a:openbsd:openssh:2.9
  • OpenBSD OpenSSH 2.9.9
    cpe:2.3:a:openbsd:openssh:2.9.9
  • OpenBSD OpenSSH 2.9.9 p2
    cpe:2.3:a:openbsd:openssh:2.9.9p2
  • OpenBSD OpenSSH 2.9 p1
    cpe:2.3:a:openbsd:openssh:2.9p1
  • OpenBSD OpenSSH 2.9 p2
    cpe:2.3:a:openbsd:openssh:2.9p2
  • OpenBSD OpenSSH 3.0
    cpe:2.3:a:openbsd:openssh:3.0
  • OpenBSD OpenSSH 3.0.1
    cpe:2.3:a:openbsd:openssh:3.0.1
  • OpenBSD OpenSSH 3.0.1 p1
    cpe:2.3:a:openbsd:openssh:3.0.1p1
  • OpenBSD OpenSSH 3.0.2
    cpe:2.3:a:openbsd:openssh:3.0.2
  • OpenBSD OpenSSH 3.0.2p1
    cpe:2.3:a:openbsd:openssh:3.0.2p1
  • OpenBSD OpenSSH 3.0 p1
    cpe:2.3:a:openbsd:openssh:3.0p1
  • OpenBSD OpenSSH 3.1
    cpe:2.3:a:openbsd:openssh:3.1
  • OpenBSD OpenSSH 3.1 p1
    cpe:2.3:a:openbsd:openssh:3.1p1
  • OpenBSD OpenSSH 3.2
    cpe:2.3:a:openbsd:openssh:3.2
  • OpenBSD OpenSSH 3.2.2
    cpe:2.3:a:openbsd:openssh:3.2.2
  • OpenBSD OpenSSH 3.2.2 p1
    cpe:2.3:a:openbsd:openssh:3.2.2p1
  • OpenBSD OpenSSH 3.2.3 p1
    cpe:2.3:a:openbsd:openssh:3.2.3p1
  • OpenBSD OpenSSH 3.3
    cpe:2.3:a:openbsd:openssh:3.3
  • OpenBSD OpenSSH 3.3 p1
    cpe:2.3:a:openbsd:openssh:3.3p1
  • OpenBSD OpenSSH 3.4
    cpe:2.3:a:openbsd:openssh:3.4
  • OpenBSD OpenSSH 3.4 p1
    cpe:2.3:a:openbsd:openssh:3.4p1
  • OpenBSD OpenSSH 3.5
    cpe:2.3:a:openbsd:openssh:3.5
  • OpenBSD OpenSSH 3.5 p1
    cpe:2.3:a:openbsd:openssh:3.5p1
  • OpenBSD OpenSSH 3.6
    cpe:2.3:a:openbsd:openssh:3.6
  • OpenBSD OpenSSH 3.6.1
    cpe:2.3:a:openbsd:openssh:3.6.1
  • OpenBSD OpenSSH 3.6.1 p1
    cpe:2.3:a:openbsd:openssh:3.6.1p1
  • OpenBSD OpenSSH 3.6.1 p2
    cpe:2.3:a:openbsd:openssh:3.6.1p2
  • OpenBSD OpenSSH 3.7
    cpe:2.3:a:openbsd:openssh:3.7
  • OpenBSD OpenSSH 3.7.1
    cpe:2.3:a:openbsd:openssh:3.7.1
  • OpenBSD OpenSSH 3.7.1 p1
    cpe:2.3:a:openbsd:openssh:3.7.1p1
  • OpenBSD OpenSSH 3.7.1 p2
    cpe:2.3:a:openbsd:openssh:3.7.1p2
  • OpenBSD OpenSSH 3.8
    cpe:2.3:a:openbsd:openssh:3.8
  • OpenBSD OpenSSH 3.8.1
    cpe:2.3:a:openbsd:openssh:3.8.1
  • OpenBSD OpenSSH 3.8.1 p1
    cpe:2.3:a:openbsd:openssh:3.8.1p1
  • OpenBSD OpenSSH 3.9
    cpe:2.3:a:openbsd:openssh:3.9
  • OpenBSD OpenSSH 3.9.1
    cpe:2.3:a:openbsd:openssh:3.9.1
  • OpenBSD OpenSSH 3.9.1 p1
    cpe:2.3:a:openbsd:openssh:3.9.1p1
  • OpenBSD OpenSSH 4.0
    cpe:2.3:a:openbsd:openssh:4.0
  • OpenBSD OpenSSH Portable 4.0.p1
    cpe:2.3:a:openbsd:openssh:4.0p1
  • OpenBSD OpenSSH 4.1
    cpe:2.3:a:openbsd:openssh:4.1
  • OpenBSD OpenSSH Portable 4.1.p1
    cpe:2.3:a:openbsd:openssh:4.1p1
  • OpenBSD OpenSSH 4.2
    cpe:2.3:a:openbsd:openssh:4.2
  • OpenBSD OpenSSH Portable 4.2.p1
    cpe:2.3:a:openbsd:openssh:4.2p1
  • OpenBSD OpenSSH 4.3
    cpe:2.3:a:openbsd:openssh:4.3
  • OpenBSD OpenSSH Portable 4.3.p1
    cpe:2.3:a:openbsd:openssh:4.3p1
  • OpenBSD OpenSSH Portable 4.3.p2
    cpe:2.3:a:openbsd:openssh:4.3p2
  • OpenBSD OpenSSH 4.4
    cpe:2.3:a:openbsd:openssh:4.4
  • OpenBSD OpenSSH Portable 4.4.p1
    cpe:2.3:a:openbsd:openssh:4.4p1
  • OpenBSD OpenSSH 4.5
    cpe:2.3:a:openbsd:openssh:4.5
  • OpenBSD OpenSSH 4.6
    cpe:2.3:a:openbsd:openssh:4.6
  • OpenBSD OpenSSH 4.7
    cpe:2.3:a:openbsd:openssh:4.7
  • OpenBSD OpenSSH 4.7p1
    cpe:2.3:a:openbsd:openssh:4.7p1
  • OpenBSD OpenSSH 4.8
    cpe:2.3:a:openbsd:openssh:4.8
  • OpenBSD OpenSSH 4.9
    cpe:2.3:a:openbsd:openssh:4.9
  • OpenBSD OpenSSH 5.0
    cpe:2.3:a:openbsd:openssh:5.0
  • OpenBSD OpenSSH 5.0 Patch 1
    cpe:2.3:a:openbsd:openssh:5.0:p1
  • OpenBSD OpenSSH 5.1
    cpe:2.3:a:openbsd:openssh:5.1
  • OpenBSD OpenSSH 5.1 Patch 1
    cpe:2.3:a:openbsd:openssh:5.1:p1
  • OpenBSD OpenSSH 5.2
    cpe:2.3:a:openbsd:openssh:5.2
  • OpenBSD OpenSSH 5.2 Patch 1
    cpe:2.3:a:openbsd:openssh:5.2:p1
  • OpenBSD OpenSSH 5.3
    cpe:2.3:a:openbsd:openssh:5.3
  • OpenBSD OpenSSH 5.3 Patch 1
    cpe:2.3:a:openbsd:openssh:5.3:p1
  • OpenBSD OpenSSH 5.4
    cpe:2.3:a:openbsd:openssh:5.4
  • OpenBSD OpenSSH 5.4 Patch 1
    cpe:2.3:a:openbsd:openssh:5.4:p1
  • OpenBSD OpenSSH 5.5
    cpe:2.3:a:openbsd:openssh:5.5
  • OpenBSD OpenSSH 5.5 Patch 1
    cpe:2.3:a:openbsd:openssh:5.5:p1
  • OpenBSD OpenSSH 5.6
    cpe:2.3:a:openbsd:openssh:5.6
  • OpenBSD OpenSSH 5.6 Patch 1
    cpe:2.3:a:openbsd:openssh:5.6:p1
  • OpenBSD OpenSSH 5.7
    cpe:2.3:a:openbsd:openssh:5.7
  • OpenBSD OpenSSH 5.7 Patch 1
    cpe:2.3:a:openbsd:openssh:5.7:p1
  • OpenBSD OpenSSH 5.8
    cpe:2.3:a:openbsd:openssh:5.8
  • OpenBSD OpenSSH 5.8 Patch 1
    cpe:2.3:a:openbsd:openssh:5.8:p1
  • OpenBSD OpenSSH 5.8p2
    cpe:2.3:a:openbsd:openssh:5.8p2
  • OpenBSD OpenSSH 5.9
    cpe:2.3:a:openbsd:openssh:5.9
  • OpenBSD OpenSSH 5.9 Patch 1
    cpe:2.3:a:openbsd:openssh:5.9:p1
  • OpenBSD OpenSSH 6.0
    cpe:2.3:a:openbsd:openssh:6.0
  • OpenBSD OpenSSH 6.0 Patch 1
    cpe:2.3:a:openbsd:openssh:6.0:p1
  • OpenBSD OpenSSH 6.1
    cpe:2.3:a:openbsd:openssh:6.1
  • OpenBSD OpenSSH 6.1 Patch 1
    cpe:2.3:a:openbsd:openssh:6.1:p1
  • OpenBSD OpenSSH 6.2
    cpe:2.3:a:openbsd:openssh:6.2
  • OpenBSD OpenSSH 6.2 Patch 1
    cpe:2.3:a:openbsd:openssh:6.2:p1
  • OpenBSD OpenSSH 6.2 Patch 2
    cpe:2.3:a:openbsd:openssh:6.2:p2
  • OpenBSD OpenSSH 6.3
    cpe:2.3:a:openbsd:openssh:6.3
  • OpenBSD OpenSSH 6.3 Patch 1
    cpe:2.3:a:openbsd:openssh:6.3:p1
  • OpenBSD OpenSSH 6.4
    cpe:2.3:a:openbsd:openssh:6.4
  • OpenBSD OpenSSH 6.4 Patch 1
    cpe:2.3:a:openbsd:openssh:6.4:p1
  • OpenBSD OpenSSH 6.5
    cpe:2.3:a:openbsd:openssh:6.5
  • OpenBSD OpenSSH 6.5 Patch 1
    cpe:2.3:a:openbsd:openssh:6.5:p1
  • OpenBSD OpenSSH 6.6
    cpe:2.3:a:openbsd:openssh:6.6
  • OpenBSD OpenSSH 6.6 Patch 1
    cpe:2.3:a:openbsd:openssh:6.6:p1
  • OpenBSD OpenSSH 6.7
    cpe:2.3:a:openbsd:openssh:6.7
  • OpenBSD OpenSSH 6.7 Patch 1
    cpe:2.3:a:openbsd:openssh:6.7:p1
  • OpenBSD OpenSSH 6.8
    cpe:2.3:a:openbsd:openssh:6.8
  • OpenBSD OpenSSH 6.8 Patch 1
    cpe:2.3:a:openbsd:openssh:6.8:p1
  • OpenBSD OpenSSH 6.9
    cpe:2.3:a:openbsd:openssh:6.9
  • OpenBSD OpenSSH 6.9 Patch 1
    cpe:2.3:a:openbsd:openssh:6.9:p1
  • OpenBSD OpenSSH 7.0
    cpe:2.3:a:openbsd:openssh:7.0
  • OpenBSD OpenSSH 7.0 Patch 1
    cpe:2.3:a:openbsd:openssh:7.0:p1
  • OpenBSD OpenSSH 7.1
    cpe:2.3:a:openbsd:openssh:7.1
  • OpenBSD OpenSSH 7.1 Patch 1
    cpe:2.3:a:openbsd:openssh:7.1:p1
  • OpenBSD OpenSSH 7.1 P2
    cpe:2.3:a:openbsd:openssh:7.1:p2
  • OpenBSD OpenSSH 7.2 Patch 2
    cpe:2.3:a:openbsd:openssh:7.2:p2
  • OpenBSD OpenSSH 7.3
    cpe:2.3:a:openbsd:openssh:7.3
  • OpenBSD OpenSSH 7.3 p1
    cpe:2.3:a:openbsd:openssh:7.3:p1
  • OpenBSD OpenSSH 7.4
    cpe:2.3:a:openbsd:openssh:7.4
  • OpenBSD OpenSSH 7.4 p1
    cpe:2.3:a:openbsd:openssh:7.4:p1
  • OpenBSD OpenSSH 7.5
    cpe:2.3:a:openbsd:openssh:7.5
  • OpenBSD OpenSSH 7.5 p1
    cpe:2.3:a:openbsd:openssh:7.5:p1
  • OpenBSD OpenSSH 7.6 p1
    cpe:2.3:a:openbsd:openssh:7.6:p1
  • Debian Linux 8.0 (Jessie)
    cpe:2.3:o:debian:debian_linux:8.0
  • Debian Linux 9.0
    cpe:2.3:o:debian:debian_linux:9.0
CVSS
Base: 5.0
Impact:
Exploitability:
CWE CWE-200
CAPEC
  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.
  • Reusing Session IDs (aka Session Replay)
    This attack targets the reuse of valid session ID to spoof the target system in order to gain privileges. The attacker tries to reuse a stolen session ID used previously during a transaction to perform spoofing and session hijacking. Another name for this type of attack is Session Replay.
  • Using Slashes in Alternate Encoding
    This attack targets the encoding of the Slash characters. An attacker would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the attacker many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.
exploit-db via4
  • description OpenSSH 7.7 - Username Enumeration. CVE-2018-15473. Remote exploit for Linux platform
    file exploits/linux/remote/45233.py
    id EDB-ID:45233
    last seen 2018-08-21
    modified 2018-08-21
    platform linux
    port
    published 2018-08-21
    reporter Exploit-DB
    source https://www.exploit-db.com/download/45233/
    title OpenSSH 7.7 - Username Enumeration
    type remote
  • file exploits/linux/remote/45939.py
    id EDB-ID:45939
    last seen 2018-12-04
    modified 2018-12-04
    platform linux
    port 22
    published 2018-12-04
    reporter Exploit-DB
    source https://www.exploit-db.com/download/45939
    title OpenSSH < 7.7 - User Enumeration (2)
    type remote
  • id EDB-ID:45210
metasploit via4
description This module uses a malformed packet or timing attack to enumerate users on an OpenSSH server. The default action sends a malformed (corrupted) SSH_MSG_USERAUTH_REQUEST packet using public key authentication (must be enabled) to enumerate users. On some versions of OpenSSH under some configurations, OpenSSH will return a "permission denied" error for an invalid user faster than for a valid user, creating an opportunity for a timing attack to enumerate users. Testing note: invalid users were logged, while valid users were not. YMMV.
id MSF:AUXILIARY/SCANNER/SSH/SSH_ENUMUSERS
last seen 2018-09-17
modified 2018-09-15
published 2014-04-28
reliability Normal
reporter Rapid7
source https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ssh/ssh_enumusers.rb
title SSH Username Enumeration
nessus via4
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DLA-1474.NASL
    description It was discovered that there was a user enumeration vulnerability in OpenSSH. A remote attacker couldtest whether a certain user exists on a target server. For Debian 8 'Jessie', this issue has been fixed in openssh version 1:6.7p1-5+deb8u5. We recommend that you upgrade your openssh packages. 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 2018-11-02
    modified 2018-11-01
    plugin id 112050
    published 2018-08-22
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=112050
    title Debian DLA-1474-1 : openssh security update
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2018-3910-1.NASL
    description This update for openssh fixes the following issues : Following security issues have been fixed : CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) 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 2018-11-29
    modified 2018-11-27
    plugin id 119213
    published 2018-11-27
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=119213
    title SUSE SLED12 / SLES12 Security Update : openssh (SUSE-SU-2018:3910-1)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2018-1477.NASL
    description This update for openssh fixes the following issues : Following security issues have been fixed : - CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) The following non-security issues were fixed : - Stop leaking File descriptors (bsc#964336) - sftp-client.c returns wrong error code upon failure [bsc#1091396] This update was imported from the SUSE:SLE-12-SP2:Update update project.
    last seen 2018-12-02
    modified 2018-11-30
    plugin id 119295
    published 2018-11-30
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=119295
    title openSUSE Security Update : openssh (openSUSE-2018-1477)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2018-F56DED11C4.NASL
    description Security fix for CVE-2018-15473 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2018-11-02
    modified 2018-11-01
    plugin id 117491
    published 2018-09-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=117491
    title Fedora 27 : openssh (2018-f56ded11c4)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201810-03.NASL
    description The remote host is affected by the vulnerability described in GLSA-201810-03 (OpenSSH: User enumeration vulnerability) It was discovered that OpenSSH was prone to a user enumeration vulnerability. Impact : A remote attacker could conduct user enumeration. Workaround : There is no known workaround at this time.
    last seen 2018-11-02
    modified 2018-11-01
    plugin id 117968
    published 2018-10-09
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=117968
    title GLSA-201810-03 : OpenSSH: User enumeration vulnerability
  • NASL family Amazon Linux Local Security Checks
    NASL id ALA_ALAS-2018-1075.NASL
    description OpenSSH is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.(CVE-2018-15473)
    last seen 2018-11-02
    modified 2018-11-01
    plugin id 117347
    published 2018-09-07
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=117347
    title Amazon Linux AMI : openssh (ALAS-2018-1075)
  • NASL family Amazon Linux Local Security Checks
    NASL id AL2_ALAS-2018-1075.NASL
    description OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.(CVE-2018-15473)
    last seen 2018-11-02
    modified 2018-11-01
    plugin id 117708
    published 2018-09-27
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=117708
    title Amazon Linux 2 : openssh (ALAS-2018-1075)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2018-1419.NASL
    description This update for openssh fixes the following issues : - CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163) - CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) The following non-security issues were fixed : - Stop leaking File descriptors (bsc#964336) - sftp-client.c returns wrong error code upon failure (bsc#1091396) - added pam_keyinit to pam configuration file (bsc#1081947) This update was imported from the SUSE:SLE-15:Update update project.
    last seen 2018-11-20
    modified 2018-11-19
    plugin id 119024
    published 2018-11-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=119024
    title openSUSE Security Update : openssh (openSUSE-2018-1419)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2018-3781-1.NASL
    description This update for openssh fixes the following issues : Following security issues have been fixed : CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163) CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) Also the following security related hardening change was done: Removed arcfour,blowfish,cast from list of default ciphers as they are long discontinued and should no longer be used. (bsc#982273) And 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 2018-11-20
    modified 2018-11-19
    plugin id 119032
    published 2018-11-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=119032
    title SUSE SLES11 Security Update : openssh (SUSE-SU-2018:3781-1)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2018-3776-1.NASL
    description This update for openssh fixes the following issues : Following security issues have been fixed : CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163) CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) Also the following security related hardening change was done: Remove arcfour,cast,blowfish from list of default ciphers. (bsc#982273) And 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 2018-11-20
    modified 2018-11-19
    plugin id 119031
    published 2018-11-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=119031
    title SUSE SLES12 Security Update : openssh (SUSE-SU-2018:3776-1)
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-3809-1.NASL
    description Robert Swiecki discovered that OpenSSH incorrectly handled certain messages. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10708) It was discovered that OpenSSH incorrectly handled certain requests. An attacker could possibly use this issue to access sensitive information. (CVE-2018-15473). 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 2018-11-14
    modified 2018-11-13
    plugin id 118795
    published 2018-11-07
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=118795
    title Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : openssh vulnerabilities (USN-3809-1)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2018-3540-1.NASL
    description This update for openssh fixes the following issues : Security issues fixed : CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability. (bsc#1106163) CVE-2017-15906: The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode, which allowed attackers to create zero-length files. (bsc#1065000, bsc#1106726) CVE-2016-10708: sshd allowed remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c. (bsc#1076957) CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010) CVE-2016-10012: Removed pre-auth compression support from the server to prevent possible cryptographic attacks. (bsc#1016370) Bugs fixed: Fixed failing 'AuthorizedKeysCommand' within a 'Match User' block in sshd_config (bsc#1105180) 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 2018-12-02
    modified 2018-12-01
    plugin id 118498
    published 2018-10-30
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=118498
    title SUSE SLES11 Security Update : openssh (SUSE-SU-2018:3540-1)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-4280.NASL
    description Dariusz Tytko, Michal Sajdak and Qualys Security discovered that OpenSSH, an implementation of the SSH protocol suite, was prone to a user enumeration vulnerability. This would allow a remote attacker to check whether a specific user account existed on the target server.
    last seen 2018-11-14
    modified 2018-11-13
    plugin id 112066
    published 2018-08-23
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=112066
    title Debian DSA-4280-1 : openssh - security update
packetstorm via4
data source https://packetstormsecurity.com/files/download/150621/openssh77-enumerate.txt
id PACKETSTORM:150621
last seen 2018-12-06
published 2018-12-05
reporter Matthew Daley
source https://packetstormsecurity.com/files/150621/OpenSSH-User-Enumeration.html
title OpenSSH User Enumeration
refmap via4
bid 105140
confirm
debian DSA-4280
gentoo GLSA-201810-03
misc
mlist [debian-lts-announce] 20180821 [SECURITY] [DLA-1474-1] openssh security update
sectrack 1041487
ubuntu USN-3809-1
Last major update 17-08-2018 - 15:29
Published 17-08-2018 - 15:29
Last modified 05-12-2018 - 06:29
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