> Advisories > rt-sa-2005-006 vertical divider

Awstats official workaround flaw

RedTeam found a flaw in the official workaround for the remote command
execution vulnerability in awstats discovered by iDefense.


Details
=======

Product: Awstats
Affected Version: <= 6.2
Immune Version: 6.3
OS affected: all
Security-Risk: high
Remote-Exploit: yes
Vendor-URL: http://awstats.sourceforge.net
Vendor-Status: informed
Advisory-URL: http://www.redteam-pentesting.de/advisories/rt-sa-2005-006
Advisory-Status: public
CVE: GENERIC-MAP-NOMATCH
(https://cve.mitre.org/cgi-bin/cvename.cgi?name=GENERIC-MAP-NOMATCH#)

Introduction
============

iDefense found a remote command execution vulnerability in awstats <= 6.2,
see CAN-2005-0116.

The official awstats website tells users that they are safe from remote
command execution if they set the variable $!AllowToUpdateStatsFromBrowser to
0. This is not true, as the exploit can still be triggered.

More Details
============

In awstats.pl the variable $configdir, which is used to exploit, can still be
set remotely. Setting $!AllowToUpdateStatsFromBrowser to 0 only removes the
link to the button which can be used to trigger updates. The variable can
still be assigned per GET request.

Proof of Concept
================

http://path/to/awstats/awstats.pl?configdir=|cd%20/tmp;%20touch%20evilfile;

Workaround
==========

Use the workaround provided by iDefense. See their advisory for the original
vulnerability.

Fix
===

Fixed in version 6.3.

Security Risk
=============

High, as arbitrary commands can be executed on the vulnerable system.

History
=======

2005-02-12 eldy@users.sourceforge.net informed 
2005-02-12 CVE number requested 
2005-02-14 issue does not qualify for a CVE number. posted.
2009-05-08 Updated Advisory URL

RedTeam
=======

RedTeam is a penetration testing group working at the Laboratory for
Dependable Distributed Systems at RWTH-Aachen University. You can find more
information on the RedTeam Project at
http://www.redteam-pentesting.de