iDefense Security Advisory 05.14.09: Apple Mac OS X xnu Kernel workqueue_additem/workqueue_removeitem Index Validation Vulnerability
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iDefense Security Advisory 05.12.09
http://labs.idefense.com/intelligence/vulnerabilities/
May 12, 2009
I. BACKGROUND
Mac OS X is a computer operating systems available from Apple Inc. OS X
is the tenth major version of Apple's operating system for Macintosh
computers and is Unix-based.
For more information, see the vendor's site found at the following link.
http://www.apple.com/support/leopard/internet/
II. DESCRIPTION
Local exploitation of an index validation vulnerability in Apple Inc.'s
Mac OS X xnu kernel could allow an attacker to execute arbitrary code
in the security context of the kernel.
The Mac OS X xnu (Mach) kernel implements workqueues. This allows the
kernel to schedule events to take place in a task. An input validation
error exists within this implementation, which can lead to execution of
arbitrary code in the kernel.
III. ANALYSIS
Exploitation of this issue allows an attacker to execute arbitrary code
in the security context of the kernel. An attacker would need a local
account on a vulnerable system to exploit this issue. Upon successful
exploitation, the attacker could elevate privileges by changing the
effective user id to root of an attacker controlled process.
Alternatively an attacker could also add or alter kernel code in memory
that is commonly referred to as a rootkit.
IV. DETECTION
Apple Inc.'s Mac OS X 10.5.2 and earlier is considered vulnerable to
this issue.
V. WORKAROUND
iDefense is currently unaware of any workaround for this issue.
VI. VENDOR RESPONSE
Apple Inc. has released a patch which addresses this issue. For more
information, consult their advisory at the following URL:
http://support.apple.com/kb/HT3549
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-1517 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
03/19/2008 - Initial Contact
03/31/2009 - Attribution Request
04/01/2009 - Attribution Sent
04/01/2009 - CVE Requested
05/12/2009 - Coordinated Public Disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Neil Kettle (mu-b) of
www.digit-labs.org.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
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X. LEGAL NOTICES
Copyright © 2009 iDefense, Inc.
Permission is granted for the redistribution of this alert
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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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