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Category:   Application (Security)  >   RADIUS (GNU) Vendors:   GNU [multiple authors]
GNU RADIUS 'sqllog' Format String Flaw Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017285
SecurityTracker URL:
CVE Reference:   CVE-2006-4181   (Links to External Site)
Date:  Nov 27 2006
Impact:   Execution of arbitrary code via network, Root access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.2, 1.3, possibly other versions
Description:   A vulnerability was reported in RADIUS (GNU). A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to trigger a format string flaw and execute arbitrary code on the target system. The code will run with the privileges of the target radiusd service. The radius daemon runs with root privileges on some systems.

The vulnerability resides within the SQL accounting code. A specially crafted 'sqllog' value can trigger the vulnerability.

The vendor was notified on August 16, 2006.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (1.4).
Vendor URL: (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

Subject:  [Full-disclosure] iDefense Security Advisory 11.26.06: GNU Radius

GNU Radius Format String Vulnerability

iDefense Security Advisory 11.26.06
Nov 26, 2006


GNU Radius is a centralized user authentication and accounting system. It
supports back-end SQL databases for accounting. More information can be
found at


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'.


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.


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


iDefense confirms that using one of the other supported accounting methods
will mitigate exploitation of this vulnerability while still allowing
accounting to take place.


The GNU Radius team included a fix for this vulnerability in version 1.4.


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 (, which standardizes names for
security problems.


08/16/2006  Initial vendor notification
09/08/2006  Initial vendor response
11/06/2006  Second vendor notification
11/26/2006  Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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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 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

Full-Disclosure - We believe in it.
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