GNU Radius Format String Vulnerability
iDefense Security Advisory 11.26.06
http://labs.idefense.com/intelligence/vulnerabilities/
Nov 26, 2006
I. BACKGROUND
GNU Radius is a centralized user authentication and accounting system. It
supports back-end SQL databases for accounting. More information can be
found at http://www.gnu.org/software/radius/
II. DESCRIPTION
Remote exploitation of a format string vulnerability in GNU Radius could
allow an attacker to execute code in the context of the running daemon.
The vulnerability specifically exists within the SQL accounting code. A
format string is built using user supplied data and then unsafely passed
to the variable argument function 'sqllog'.
III. ANALYSIS
Successful exploitation allows unauthenticated remote attackers to execute
arbitrary code in the context of the running radius daemon (radiusd).
Typically the radius daemon will run as root.
Exploitation requires that radiusd be compiled with an SQL back-end and
SQL accounting be turned on. These options are both turned on by default
for FreeBSD and Gentoo Linux.
IV. DETECTION
iDefense has confirmed that this vulnerability is present in version 1.3
and 1.2 of GNU Radius. It is likely that all prior versions are
vulnerable.
V. WORKAROUND
iDefense confirms that using one of the other supported accounting methods
will mitigate exploitation of this vulnerability while still allowing
accounting to take place.
VI. VENDOR RESPONSE
The GNU Radius team included a fix for this vulnerability in version 1.4.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4181 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
08/16/2006 Initial vendor notification
09/08/2006 Initial vendor response
11/06/2006 Second vendor notification
11/26/2006 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2006 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
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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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