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TITLE:
IBM AIX rpc.cmsd Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA36978

VERIFY ADVISORY:
http://secunia.com/advisories/36978/

DESCRIPTION:
A vulnerability has been reported in IBM AIX, which can be exploited
by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the calendar
daemon library "libcsa.a". This can be exploited to cause a
stack-based buffer overflow by sending a specially crafted request
with an overly long argument for remote procedure 21 to the Calendar
Manager Service Daemon (rpc.cmsd).

Successful exploitation allows execution of arbitrary code with root
privileges.

The vulnerability is reported in AIX 5.3 and 6.1, and VIOS 1.4, 1.5,
and 2.1. Prior versions may also be affected.

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

AIX 5.3.0:
IZ62672 (apply the interim fix)

AIX 5.3.7:
IZ61628 (approximately available 11/11/09 (sp10))

AIX 5.3.8:
IZ62237 (approximately available 11/11/09 (sp8))

AIX 5.3.9:
IZ61717 (approximately available 11/11/09 (sp5))

AIX 5.3.10:
IZ62123 (approximately available 11/11/09 (sp2))

IAX 6.1.0:
IZ62569 (approximately available 12/16/09 (sp11))

AIX 6.1.1:
IZ62570 (approximately available 12/16/09 (sp7))

AIX 6.1.2:
IZ62571 (approximately available 12/16/09 (sp6))

AIX 6.1.3:
IZ62572 (approximately available 12/16/09 (sp3))

VIOS 1.4, 1.5.0, 1.5.1, 1.5.2, 2.1.0, 2.1.1:
Apply the interim fix (please see the vendor advisory for details).

PROVIDED AND/OR DISCOVERED BY:
Rodrigo Rubira Branco, reported via iDefense.

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

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=825

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