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iDefense Security Advisory 07.12.07: Red Hat Enterprise Linux init.d XFS Script chown Race Condition Vulnerability
From: iDefense Labs <labs-no-reply () idefense com>
Date: Thu, 12 Jul 2007 12:37:10 -0400
Red Hat Enterprise Linux init.d XFS Script chown Race Condition
iDefense Security Advisory 07.12.07
Jul 12, 2007
XFS is the X Font Server, and is used to render fonts for the X Window
System. "init.d" refers to the startup and shutdown scripts used by
Linux distributions. These scripts are run by the init process to start
and stop various system services.
Local exploitation of a race condition vulnerability in Red Hat Inc.'s
Enterprise Linux init.d XFS script allows an attacker to elevate their
privileges to root.
The XFS script is vulnerable to a race condition when it is started by
init, or by a system administrator. Specifically, it insecurely changes
the file permissions of a temporary file. This allows an attacker to
make any file on the system world writable.
Exploitation of this vulnerability results in an attacker gaining root
privileges on the affected system.
However, in order to exploit this, it is necessary for either the system
to be rebooted, or for the administrator to manually restart the XFS.
iDefense has confirmed the existence of this vulnerability in Red Hat
Enterprise Linux version 4, and Fedora Core 6. Other versions may also
iDefense is currently unaware of any workarounds for this issue.
VI. VENDOR RESPONSE
Red Hat has released errata updates for versions 4 and 5 of their
Enterprise Linux software. More information is available at the URLs
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3103 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
06/05/2007 Initial vendor notification
06/06/2007 Initial vendor response
07/12/2007 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
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part of this alert in any other medium other than electronically,
please e-mail 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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- iDefense Security Advisory 07.12.07: Red Hat Enterprise Linux init.d XFS Script chown Race Condition Vulnerability iDefense Labs (Jul 12)