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TITLE:
IBM AIX "muxatmd" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA34662

VERIFY ADVISORY:
http://secunia.com/advisories/34662/

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

The vulnerability is caused due to a boundary error in the
"/usr/sbin/muxatmd" command, which is setuid root. This can be
exploited to cause a stack-based buffer overflow via a program that
calls "muxatmd" with a specially crafted parameter.

Successful exploitation allows executing arbitrary code with root
privileges.

The vulnerability is reported in AIX 5.2, 5.3, and 6.1.

SOLUTION:
Apply the fixes or APARs as soon as they become available.
http://aix.software.ibm.com/aix/efixes/security/muxatmd_fix.tar

AIX 5.2.0:
IZ48495 (approximately available 07/22/2009)

AIX 5.3.0:
IZ48496 (approximately available 07/01/2009)

AIX 5.3.7:
IZ48499 (approximately available07/01/2009)

AIX 5.3.8:
IZ48500 (approximately available 07/01/2009)

AIX 5.3.9:
IZ48501 (approximately available 07/01/2009)

AIX 6.1.0:
IZ48502 (approximately available 06/03/2009)

AIX 6.1.1:
IZ48561 (approximately available 06/03/2009)

AIX 6.1.2:
IZ48562 (approximately available 06/03/2009)

PROVIDED AND/OR DISCOVERED BY:
An anonymous person, reported via iDefense.

ORIGINAL ADVISORY:
IBM:
http://aix.software.ibm.com/aix/efixes/security/muxatmd_advisory.asc

iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=784

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