bugtraq - [ GLSA 200511-09 ] Lynx: Arbitrary command execution

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Message-ID: <4377747B.1030208@gentoo.org>
Date: Sun, 13 Nov 2005 18:14:35 +0100
From: Thierry Carrez <koon@...too.org>
To: gentoo-announce@...ts.gentoo.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200511-09 ] Lynx: Arbitrary command
	execution

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Gentoo Linux Security Advisory                           GLSA 200511-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Lynx: Arbitrary command execution
      Date: November 13, 2005
      Bugs: #112213
        ID: 200511-09

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Synopsis
========

Lynx is vulnerable to an issue which allows the remote execution of
arbitrary commands.

Background
==========

Lynx is a fully-featured WWW client for users running
cursor-addressable, character-cell display devices such as vt100
terminals and terminal emulators.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  www-client/lynx     < 2.8.5-r2                        >= 2.8.5-r2

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

iDefense labs discovered a problem within the feature to execute local
cgi-bin programs via the "lynxcgi:" URI handler. Due to a configuration
error, the default settings allow websites to specify commands to run
as the user running Lynx.

Impact
======

A remote attacker can entice a user to access a malicious HTTP server,
causing Lynx to execute arbitrary commands.

Workaround
==========

Disable "lynxcgi" links by specifying the following directive in
lynx.cfg:

    TRUSTED_LYNXCGI:none

Resolution
==========

All Lynx users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-client/lynx-2.8.5-r2"

References
==========

  [ 1 ] CVE-2005-2929
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2929
  [ 2 ] iDefense Security Advisory 11.11.05

http://www.idefense.com/application/poi/display?id=338&type=vulnerabilities

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

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

  http://security.gentoo.org/glsa/glsa-200511-09.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 2005 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/2.0

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