[ GLSA 200705-17 ] Apache mod_security: Rule bypass

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Gentoo Linux Security Advisory GLSA 200705-17
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http://security.gentoo.org/
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Severity: Low
Title: Apache mod_security: Rule bypass
Date: May 17, 2007
Bugs: #169778
ID: 200705-17

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Synopsis
========

A vulnerability has been discovered in mod_security, allowing a remote
attacker to bypass rules.

Background
==========

mod_security is an Apache module designed for enhancing the security of
the Apache web server.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-www/mod_security < 2.1.1 >= 2.1.1

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

Stefan Esser discovered that mod_security processes NULL characters as
terminators in POST requests using the
application/x-www-form-urlencoded encoding type, while other parsers
used in web applications do not.

Impact
======

A remote attacker could send a specially crafted POST request, possibly
bypassing the module ruleset and leading to the execution of arbitrary
code in the scope of the web server with the rights of the user running
the web server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All mod_security users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-www/mod_security-2.1.1"

References
==========

[ 1 ] CVE-2007-1359
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1359

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

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

http://security.gentoo.org/glsa/glsa-200705-17.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@xxxxxxxxxx or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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/2.5

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