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[ GLSA 200907-02 ] ModSecurity: Denial of Service
From: Alex Legler <a3li () gentoo org>
Date: Thu, 02 Jul 2009 21:38:32 +0200

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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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