GLSA 200907-02 ModSecurity: Denial of Service
Posted on: 07/02/2009 08:50 PM

A new security update has been released for Gentoo Linux - ModSecurity: Denial of Service. Here the announcement:

Gentoo Linux Security Advisory GLSA 200907-02
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http://security.gentoo.org/
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Severity: Normal
Title: ModSecurity: Denial of Service
Date: July 02, 2009
Bugs: #262302
ID: 200907-02

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Synopsis
========

Two vulnerabilities in ModSecurity might lead to a Denial of Service.

Background
==========

ModSecurity is a popular web application firewall for the Apache HTTP
server.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 www-apache/mod_security lt; 2.5.9 gt;= 2.5.9

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

Multiple vulnerabilities were discovered in ModSecurity:

* Juan Galiana Lara of ISecAuditors discovered a NULL pointer
dereference when processing multipart requests without a part header
name (CVE-2009-1902).

* Steve Grubb of Red Hat reported that the "PDF XSS protection"
feature does not properly handle HTTP requests to a PDF file that do
not use the GET method (CVE-2009-1903).

Impact
======

A remote attacker might send requests containing specially crafted
multipart data or send certain requests to access a PDF file, possibly
resulting in a Denial of Service (crash) of the Apache HTTP daemon.
NOTE: The PDF XSS protection is not enabled by default.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ModSecurity users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=www-apache/mod_security-2.5.9"

References
==========

[ 1 ] CVE-2009-1902
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1902
[ 2 ] CVE-2009-1903
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1903

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

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

http://security.gentoo.org/glsa/glsa-200907-02.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 2009 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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