Technical Description

A vulnerability has been identified in IBM AIX, which could be exploited by local attackers to gain elevated privileges. This issue is caused by a buffer overflow error in the setuid root binary "/usr/sbin/muxatmd" when concatenating the calling program name with the static string ".pid", which could allow malicious users to execute arbitrary code with "root" privileges.

Affected Products

IBM AIX 5.2
IBM AIX 5.3
IBM AIX 6.1

Solution

Apply fix :
http://aix.software.ibm.com/aix/efixes/security/muxatmd_fix.tar

IBM AIX 5.2.0 - Apply APAR IZ48495 (available approx. 07/22/2009)
IBM AIX 5.3.0 - Apply APAR IZ48496 (available approx. 07/01/2009)
IBM AIX 5.3.7 - Apply APAR IZ48499 (available approx. 07/01/2009)
IBM AIX 5.3.8 - Apply APAR IZ48500 (available approx. 07/01/2009)
IBM AIX 5.3.9 - Apply APAR IZ48501 (available approx. 07/01/2009)
IBM AIX 5.1.0 - Apply APAR IZ48502 (available approx. 06/03/2009)
IBM AIX 5.1.1 - Apply APAR IZ48561 (available approx. 06/03/2009)
IBM AIX 5.1.2 - Apply APAR IZ48562 (available approx. 06/03/2009)

References

http://www.vupen.com/english/advisories/2009/1056
http://aix.software.ibm.com/aix/efixes/security/muxatmd_advisory.asc
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=784

Credits

Vulnerability reported by iDefense Labs.

ChangeLog

2009-04-16 : Initial release

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