bugtraq - [ GLSA 200709-16 ] Lighttpd: Buffer overflow

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Date: Thu, 27 Sep 2007 23:01:46 +0200
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200709-16 ] Lighttpd: Buffer overflow

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Gentoo Linux Security Advisory                           GLSA 200709-16
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Lighttpd: Buffer overflow
      Date: September 27, 2007
      Bugs: #191912
        ID: 200709-16

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Synopsis
========

Lighttpd is vulnerable to the remote execution of arbitrary code.

Background
==========

Lighttpd is a lightweight HTTP web server.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  www-servers/lighttpd      < 1.4.18                      >= 1.4.18

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

Mattias Bengtsson and Philip Olausson have discovered a buffer overflow
vulnerability in the function fcgi_env_add() in the file mod_fastcgi.c
when processing overly long HTTP headers.

Impact
======

A remote attacker could send a specially crafted request to the
vulnerable Lighttpd server, resulting in the remote execution of
arbitrary code with privileges of the user running the web server. Note
that mod_fastcgi is disabled in Gentoo's default configuration.

Workaround
==========

Edit the file /etc/lighttpd/lighttpd.conf and comment the following
line: "include mod_fastcgi.conf"

Resolution
==========

All Lighttpd users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-servers/lighttpd-1.4.18"

References
==========

  [ 1 ] CVE-2007-4727
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4727

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

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

  http://security.gentoo.org/glsa/glsa-200709-16.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@...too.org 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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