[ GLSA 200907-04 ] Apache: Multiple vulnerabilities

[Alex Legler <a3li () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200907-04
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Apache: Multiple vulnerabilities
      Date: July 12, 2009
      Bugs: #268154, #271470, #276426, #276792
        ID: 200907-04

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Synopsis
========

Multiple vulnerabilities in the Apache HTTP daemon allow for local
privilege escalation, information disclosure or Denial of Service
attacks.

Background
==========

The Apache HTTP server is one of the most popular web servers on the
Internet.

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

    -------------------------------------------------------------------
     Package             /   Vulnerable   /                 Unaffected
    -------------------------------------------------------------------
  1  www-servers/apache      < 2.2.11-r2                  >= 2.2.11-r2

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

Multiple vulnerabilities have been discovered in the Apache HTTP
server:

* Jonathan Peatfield reported that the "Options=IncludesNoEXEC"
  argument to the "AllowOverride" directive is not processed properly
  (CVE-2009-1195).

* Sander de Boer discovered that the AJP proxy module (mod_proxy_ajp)
  does not correctly handle POST requests that do not contain a request
  body (CVE-2009-1191).

* The vendor reported that the HTTP proxy module (mod_proxy_http),
  when being used as a reverse proxy, does not properly handle requests
  containing more data as stated in the "Content-Length" header
  (CVE-2009-1890).

* Francois Guerraz discovered that mod_deflate does not abort the
  compression of large files even when the requesting connection is
  closed prematurely (CVE-2009-1891).

Impact
======

A local attacker could circumvent restrictions put up by the server
administrator and execute arbitrary commands with the privileges of the
user running the Apache server. A remote attacker could send multiple
requests to a server with the AJP proxy module, possibly resulting in
the disclosure of a request intended for another client, or cause a
Denial of Service by sending specially crafted requests to servers
running mod_proxy_http or mod_deflate.

Workaround
==========

Remove "include", "mod_proxy_ajp", "mod_proxy_http" and "deflate" from
APACHE2_MODULES in make.conf and rebuild Apache, or disable the
aforementioned modules in the Apache configuration.

Resolution
==========

All Apache users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-servers/apache-2.2.11-r2"

References
==========

  [ 1 ] CVE-2009-1195
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1195
  [ 2 ] CVE-2009-1191
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1191
  [ 3 ] CVE-2009-1890
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1890
  [ 4 ] CVE-2009-1891
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1891

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

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

  http://security.gentoo.org/glsa/glsa-200907-04.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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