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AUSCERT External Security Bulletin Redistribution
ESB-2005.0124 -- iDEFENSE Security Advisory 02.08.05
IBM AIX auditselect Local Format String Vulnerability
9 February 2005
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AusCERT Security Bulletin Summary
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Publisher: iDEFENSE
Operating System: AIX
Impact: Root Compromise
Execute Arbitrary Code/Commands
Access: Existing Account
Original Bulletin: http://www.idefense.com/application/poi/display?id=193
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IBM AIX auditselect Local Format String Vulnerability
iDEFENSE Security Advisory 02.08.05
www.idefense.com/application/poi/display?id=193&type=vulnerabilities
February 08, 2005
I. BACKGROUND
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.
II. DESCRIPTION
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.
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.
III. 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.
IV. DETECTION
iDEFENSE has confirmed the existence of this vulnerability in IBM AIX
version 5.2. It is suspected that previous versions are also vulnerable.
IBM has reported that AIX 5.3 is also vulnerable.
V. 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.
VI. VENDOR RESPONSE
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
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
12/21/2004 Initial vendor notification
01/07/2005 Initial vendor response
02/08/2005 Public disclosure
IX. CREDIT
iDEFENSE Labs is credited with this discovery.
Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp
X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
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