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From: iDefense Labs (labs-no-replyidefense.com)
Date: Thu Jul 12 2007 - 11:37:10 CDT
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.
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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
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There are no warranties with regard to this information. Neither the
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