OpenSSH Kerberos 4 TGT/AFS buffer overflow
| openssh-sshd-kerberos-bo (8896) |  High 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.
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
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.
Consequences:
Gain Privileges
References:
- BugTraq Mailing List, Fri Apr 19 2002 - 17:42:51 CDT, OpenSSH 2.2.0 - 3.1.0 server contains a locally exploitable buffer overflow at http://archives.neohapsis.com/archives/bugtraq/2002-04/0283.html.
- BugTraq Mailing List, Fri Apr 26 2002 - 06:59:49 CDT, Revised OpenSSH Security Advisory (adv.token) at http://archives.neohapsis.com/archives/bugtraq/2002-04/0372.html.
- BugTraq Mailing List, Fri May 17 2002 - 01:42:42 CDT, OpenSSH 3.2.2 released (fwd) at http://archives.neohapsis.com/archives/bugtraq/2002-05/0150.html.
- BugTraq Mailing List, Sat Apr 20 2002 - 22:39:31 CDT, OpenSSH Security Advisory (adv.token) at http://archives.neohapsis.com/archives/bugtraq/2002-04/0298.html.
- Caldera International, Inc. Security Advisory CSSA-2002-022.0, Linux: OpenSSH ticket and token passing buffer overflow at ftp://ftp.sco.com/pub/security/OpenLinux/CSSA-2002-022.0.txt.
- Caldera International, Inc. Security Advisory CSSA-2002-022.2, Linux: REVISED: OpenSSH ticket and token passing buffer overflow at ftp://ftp.sco.com/pub/security/OpenLinux/CSSA-2002-022.2.txt.
- OpenSSH Web site, OpenSSH at http://www.openssh.com/.
- Trustix Secure Linux Security Advisory #2002-0047, Minor security issue at http://www.trustix.net/errata/2002/0047/.
- BID-4560: OpenSSH Kerberos 4 TGT/AFS Token Buffer Overflow Vulnerability
- CVE-2002-0575: Buffer overflow in OpenSSH before 2.9.9, and 3.x before 3.2.1, with Kerberos/AFS support and KerberosTgtPassing or AFSTokenPassing enabled, allows remote and local authenticated users to gain privileges.
- OSVDB ID: 781: OpenSSH Kerberos TGT/AFS Token Passing Remote Overflow
Reported:
Apr 19, 2002
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