The workaround provided to fix the AWStats flaw in versions 6.2 and below fails to properly block remote command execution.
72c3e8554fa95ac35e7f24b89eceed854f0e0efc3a0136c63397b076befd9009
Advisory: Awstats official workaround flaw
A group of students at our lab called 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://tsyklon.informatik.rwth-aachen.de/redteam/advisories/rt-sa-2005
-006
Advisory-Status: public
CVE: 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.
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://tsyklon.informatik.rwth-aachen.de/redteam/
--
Maximillian Dornseif, Dipl. Jur., CISSP
Laboratory for Dependable Distributed Systems, RWTH Aachen University
Tel. +49 241 80-21431 - http://md.hudora.de/