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TITLE:
IBM AIX "at" Command Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA33915

VERIFY ADVISORY:
http://secunia.com/advisories/33915/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
AIX 5.x
http://secunia.com/advisories/product/213/
AIX 6.x
http://secunia.com/advisories/product/16995/

DESCRIPTION:
A vulnerability has been reported in AIX, which can be exploited by
malicious, local users to perform certain actions with escalated
privileges.

The vulnerability is caused due to the "at" command being setuid root
and not dropping privileges when reading certain files. This can be
exploited to read arbitrary files on the system.

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

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

AIX 5.2.0:
IZ43452 (available approximately 7/22/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43452

AIX 5.3.0:
IZ43453 (available approximately 4/29/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43453

AIX 5.3.7:
IZ43454 (available approximately 4/29/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43454

AIX 5.3.8:
IZ43455 (available approximately 4/29/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43455

AIX 5.3.9:
IZ43456 (available approximately 4/29/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43456

AIX 6.1.0:
IZ43457 (available approximately 6/03/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43457

AIX 6.1.1:
IZ43458 (available approximately 6/03/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43458

AIX 6.1.2:
IZ43459 (available approximately 6/03/2009)
http://www.ibm.com/support/docview.wss?uid=isg1IZ43459

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

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

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