[ GLSA 200511-09 ] Lynx: Arbitrary command execution

[Thierry Carrez <koon () gentoo org>]

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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 () gentoo 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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