[UNIX] IBM AIX auditselect Local Format String Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 02/14/05
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To: list@securiteam.com Date: 14 Feb 2005 13:46:51 +0200
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IBM AIX auditselect Local Format String Vulnerability
------------------------------------------------------------------------
SUMMARY
The auditselect program is "a setuid root application, installed by
default under multiple versions of IBM AIX, that selects audit records for
analysis according to defined criteria".
Local exploitation of a format string vulnerability in the auditselect
command included by default in multiple versions of IBM Corp.'s AIX
operating system could allow for arbitrary code execution as the root
user.
DETAILS
Vulnerable Systems:
* IBM AIX version 5.2
* IBM AIX version 5.3
The vulnerability specifically exists due to an improperly used formatted
printing function. When provided with an incorrect argument (argv[1]) that
contains a format string, the format string will be fed into a formatted
printing function, and the user supplied format string will be evaluated,
allowing for a malicious user to examine stack memory and write to
arbitrary memory locations. With a properly crafted string, this can lead
to the execution of arbitrary code.
Analysis:
This vulnerability can only be exploited by a local user who has been
granted access to the "audit" group. Successful exploitation leads to
root-level access.
Due to the nature of the vulnerability, information leakage is trivial and
aids the attacker in exploitation.
Workaround:
Only allow trusted users local access to security critical systems. Only
allow trusted system administrators access to the "audit" group.
Alternately, remove the setuid bit from auditselect using chmod u-s
/usr/sbin/auditselect.
Vendor Status:
The vendor has not released a patch for this issue, however, the following
details have been published:
<http://www-1.ibm.com/support/docview.wss?uid=isg1IY67519>
http://www-1.ibm.com/support/docview.wss?uid=isg1IY67519
Disclosure Timeline:
12/21/2004 - Initial vendor notification
01/07/2005 - Initial vendor response
02/08/2005 - Public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:customerservice@idefense.com> iDEFENSE Customer Service.
The original article can be found at:
<http://www.idefense.com/application/poi/display?id=193&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=193&type=vulnerabilities
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