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TITLE:
Op "XAUTHORITY" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA31103

VERIFY ADVISORY:
http://secunia.com/advisories/31103/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
Op 1.x
http://secunia.com/product/19322/

DESCRIPTION:
Nico Golde has reported a vulnerability in Op, which can be exploited
by malicious, local users to gain escalated privileges.

The vulnerability is caused due to a boundary error within the "Go()"
function in main.c. This can be exploited to cause a stack-based
buffer overflow via an overly long "XAUTHORITY" environment
variable.

Successful exploitation requires that "xauth" is enabled.

The vulnerability is reported in version 1.32. Other versions may
also be affected.

SOLUTION:
Fixed in the development repository.
http://swapoff.org/changeset/563

PROVIDED AND/OR DISCOVERED BY:
Nico Golde

ORIGINAL ADVISORY:
http://www.openwall.com/lists/oss-security/2008/07/12/4

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About:
This Advisory was delivered by Secunia as a free service to help
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