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Date: Thu, 12 Jul 2007 12:37:10 -0400 From: iDefense Labs <labs-no-reply@...fense.com> To: vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com Subject: iDefense Security Advisory 07.12.07: Red Hat Enterprise Linux init.d XFS Script chown Race Condition Vulnerability Red Hat Enterprise Linux init.d XFS Script chown Race Condition Vulnerability iDefense Security Advisory 07.12.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jul 12, 2007 I. BACKGROUND 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. II. DESCRIPTION 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. III. ANALYSIS 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. IV. DETECTION iDefense has confirmed the existence of this vulnerability in Red Hat Enterprise Linux version 4, and Fedora Core 6. Other versions may also be affected. V. WORKAROUND 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 shown below. https://rhn.redhat.com/errata/RHSA-2007-0519.html https://rhn.redhat.com/errata/RHSA-2007-0520.html 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 security problems. VIII. DISCLOSURE TIMELINE 06/05/2007 Initial vendor notification 06/06/2007 Initial vendor response 07/12/2007 Coordinated public disclosure IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ 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 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 e-mail customerservice@...fense.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. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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