OpenSSH Kerberos 4 TGT/AFS buffer overflow

openssh-sshd-kerberos-bo (8896) The risk level is classified as HighHigh Risk

Description:

The sshd daemon in OpenSSH is vulnerable to a buffer overflow, if sshd is compiled with Kerberos/AFS support and "Kerberos TGT Passing" or "AFS Token Passing" is enabled in the "sshd_config" file. A remote attacker can overflow a buffer and overwrite stack variables to execute arbitrary code on the system. Kerberos ticket and token passing is disabled by default.

Note: Only local attackers can exploit this vulnerability in versions later than 2.9.9.


Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of OpenSSH (3.2.2 or later), available from the OpenSSH Web site. See References.

For Caldera OpenLinux 3.1 and 3.1.1 (Server and Workstation):
Upgrade to the latest version of OpenSSH (3.2.3p1-2 or later), as listed in Caldera International, Inc. Security Advisory CSSA-2002-022.2. See References.

For Trustix Secure Linux 1.1, 1.2, and 1.5:
Upgrade to the latest version of OpenSSH (3.1.0p1-3tr or later), as listed in Trustix Secure Linux Security Advisory #2002-0047. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

Platforms Affected:

  • 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
  • SCO Caldera OpenLinux Server 3.1
  • SCO Caldera OpenLinux Server 3.1.1
  • SCO Caldera OpenLinux Workstation 3.1
  • SCO Caldera OpenLinux Workstation 3.1.1
  • Trustix Secure Linux 1.1
  • Trustix Secure Linux 1.2
  • Trustix Secure Linux 1.5

Reported:

Apr 19, 2002

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