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 [EMAIL PROTECTED] 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/
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