OpenSSH GSSAPI user enumeration

openssh-gssapi-user-enumeration (29255) The risk level is classified as LowLow Risk

Description:

OpenSSH portable version could allow a remote attacker to determine valid usernames. The GSSAPI authentication abort returns different error messages depending on whether a valid username has been entered during a login attempt. An attacker could use this information to enumerate valid usernames.

*CVSS:

Base Score: 3.5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 2.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

Upgrade to the latest version of Mac OS X (10.4.9 or later) or apply Apple Security Update 2007-003. See References.

Upgrade to the latest version of OpenSSH (4.4 or later), available from the OpenSSH Web site. See References.

For SUSE Linux:
Refer to SUSE-SA:2006:062 for patch, upgrade, or suggested workaround information. See References.

References:

Platforms Affected:

  • Gentoo Linux
  • Novell Linux Desktop 9
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell Open Enterprise Server
  • Novell UnitedLinux 1.0
  • OpenBSD OpenSSH 1.2
  • OpenBSD OpenSSH 1.2.1
  • OpenBSD OpenSSH 1.2.2
  • OpenBSD OpenSSH 1.2.27
  • OpenBSD OpenSSH 1.2.3
  • OpenBSD OpenSSH 2.1
  • OpenBSD OpenSSH 2.1.1
  • OpenBSD OpenSSH 2.1.1p4
  • OpenBSD OpenSSH 2.2
  • OpenBSD OpenSSH 2.2.0p1
  • OpenBSD OpenSSH 2.3
  • OpenBSD OpenSSH 2.3.0p1
  • OpenBSD OpenSSH 2.5
  • OpenBSD OpenSSH 2.5.1
  • OpenBSD OpenSSH 2.5.1p1
  • OpenBSD OpenSSH 2.5.1p2
  • OpenBSD OpenSSH 2.5.2
  • OpenBSD OpenSSH 2.5.2p1
  • OpenBSD OpenSSH 2.5.2p2
  • OpenBSD OpenSSH 2.9
  • OpenBSD OpenSSH 2.9.9
  • OpenBSD OpenSSH 2.9.9p1
  • OpenBSD OpenSSH 2.9.9p2
  • OpenBSD OpenSSH 2.9p1
  • OpenBSD OpenSSH 2.9p2
  • OpenBSD OpenSSH 3.0
  • OpenBSD OpenSSH 3.0.1
  • OpenBSD OpenSSH 3.0.1p1
  • OpenBSD OpenSSH 3.0.2
  • OpenBSD OpenSSH 3.0.2p1
  • OpenBSD OpenSSH 3.0p1
  • OpenBSD OpenSSH 3.1
  • OpenBSD OpenSSH 3.1p1
  • OpenBSD OpenSSH 3.2
  • OpenBSD OpenSSH 3.2.2
  • OpenBSD OpenSSH 3.2.2p1
  • OpenBSD OpenSSH 3.2.3
  • OpenBSD OpenSSH 3.2.3p1
  • OpenBSD OpenSSH 3.3
  • OpenBSD OpenSSH 3.3p1
  • OpenBSD OpenSSH 3.4
  • OpenBSD OpenSSH 3.4p1
  • OpenBSD OpenSSH 3.5
  • OpenBSD OpenSSH 3.5p1
  • OpenBSD OpenSSH 3.6
  • OpenBSD OpenSSH 3.6.1
  • OpenBSD OpenSSH 3.6.1p1
  • OpenBSD OpenSSH 3.6.1p2
  • OpenBSD OpenSSH 3.7
  • OpenBSD OpenSSH 3.7.1
  • OpenBSD OpenSSH 3.7.1p1
  • OpenBSD OpenSSH 3.7.1p2
  • OpenBSD OpenSSH 3.8
  • OpenBSD OpenSSH 3.8.1
  • OpenBSD OpenSSH 3.8.1p1
  • OpenBSD OpenSSH 3.9
  • OpenBSD OpenSSH 3.9.1
  • OpenBSD OpenSSH 3.9.1p1
  • OpenBSD OpenSSH 4.0
  • OpenBSD OpenSSH 4.0p1
  • OpenBSD OpenSSH 4.1
  • OpenBSD OpenSSH 4.1p1
  • OpenBSD OpenSSH 4.2
  • OpenBSD OpenSSH 4.2p1
  • OpenBSD OpenSSH 4.3
  • OpenBSD OpenSSH 4.3p1
  • OpenBSD OpenSSH 4.3p2
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • SuSE Linux Enterprise Server 8
  • SUSE SuSE Linux 10.0
  • SUSE SuSE Linux 10.1
  • SUSE SuSE Linux 9.2
  • SUSE SuSE Linux 9.3
  • SuSE SuSE Linux Desktop 1.0
  • SuSE SuSE Linux OpenExchange Server 4
  • SuSE SuSE Linux Retail Solution 8
  • SuSE SuSE Linux School Server
  • SuSE SuSE Linux Standard Server 8
  • SuSE SuSE SLED 10
  • SuSE SuSE SLES 10
  • SuSE SuSE SLES 9
  • Turbolinux Turbolinux 10 Server
  • Turbolinux Turbolinux 10 Server x64 Ed
  • Turbolinux Turbolinux FUJI
  • Turbolinux Turbolinux Appliance Server 2.0

Reported:

Sep 27, 2006

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page

* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

About IBM Security Systems

IBM Security Systems include an extensive portfolio of hardware, software solutions, professional and managed services offerings covering the spectrum of IT and business security risks: people and identity, data and information, application and process, network, server and endpoint and physical infrastructure, empowering clients to innovate and operate their businesses on the most secure infrastructure platforms. Through world-class solutions that address risk across the enterprise, IBM helps organizations build a strong security posture that helps reduce costs, improve service, and manage risk. IBM X-Force(R) Research and Development is one of the most renowned commercial security research and development groups in the world. For more information on how to address today's biggest risks, please visit us at ibm.com/security.