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TITLE:
IBM AIX libc MALLOCDEBUG Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA35146

VERIFY ADVISORY:
http://secunia.com/advisories/35146/

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 race condition error in the
"MALLOCDEBUG" debugging component of the malloc subsystem within
libc.a. This can be exploited to overwrite arbitrary files when
executing setuid root programs and execute arbitrary code with root
privileges.

The vulnerability is reported in AIX 5.3 and 6.1.

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

AIX 5.3.0:
IZ50500 (approximately available 07/01/09)

AIX 5.3.7:
IZ50517 (approximately available 07/01/09)

AIX 5.3.8:
IZ50447 (approximately available 07/01/09)

AIX 5.3.9:
IZ50445 (approximately available 07/01/09)

AIX 6.1.0:
IZ50139 (approximately available 06/03/09)

AIX 6.1.1:
IZ50129 (approximately available 06/03/09)

AIX 6.1.2:
IZ50121 (approximately available 06/03/09)

PROVIDED AND/OR DISCOVERED BY:
The vendor credits iDefense Labs.

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

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