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[gentoo-announce] [ GLSA 200907-02 ] ModSecurity: Denial of Service

Posted on 02 July 2009
Gentoo-announce

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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 < 2.5.9 >= 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 ">=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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