[UNIX] AFS/Kerberos Support in OpenSSH Poses a Security Threat

From: support@securiteam.com
Date: 04/22/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 22 Apr 2002 21:49:48 +0200 (CEST)

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  AFS/Kerberos Support in OpenSSH Poses a Security Threat
------------------------------------------------------------------------

SUMMARY

A buffer overflow exists in OpenSSH's sshd if sshd has been compiled with
Kerberos/AFS support and KerberosTgtPassing or AFSTokenPassing has been
enabled in the sshd_config file. Ticket and token passing is not enabled
by default.

DETAILS

Systems affected:
All Versions of OpenSSH compiled with AFS/Kerberos support and
ticket/token passing enabled contains a buffer overflow.

Ticket/Token passing is disabled by default and available only in protocol
version 1.

Impact:
Remote users may gain privileged access for OpenSSH < 2.9.9 .
Local users may gain privileged access for OpenSSH < 3.3 .
No privileged access is possible for OpenSSH with UsePrivsep enabled.

Solution:
Apply the following patch and replace radix.c with
 <http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/radix.c?rev=1.18>
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/radix.c?rev=1.18

ADDITIONAL INFORMATION

The information has been provided by <mailto:provos@citi.umich.edu> Niels
Provos.

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