[SA22098] IBM AIX xlock Buffer Overflow Vulnerability

TITLE:
IBM AIX xlock Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA22098

VERIFY ADVISORY:
http://secunia.com/advisories/22098/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
AIX 5.x
http://secunia.com/product/213/

DESCRIPTION:
A vulnerability has been reported in IBM AIX, which can be exploited
by malicious, local users to gain escalated privileges.

The vulnerability is due to a unspecified boundary error in xlock.
This can be exploited to cause a buffer overflow and allows arbitrary
code execution with root privileges.

SOLUTION:
Apply Interim fixes until APARs are available.

Interim fix:
ftp://aix.software.ibm.com/aix/efixes/security/xlock_ifix.tar.Z

APAR for AIX 5.2.0:
Apply IY87943 (available).

APAR for AIX 5.3.0:
Apply IY87894 (available approx. 2006-10-04).

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
IBM:
http://www-1.ibm.com/support/docview.wss?uid=isg1IY87943
http://www-1.ibm.com/support/docview.wss?uid=isg1IY87894

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