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[Full-disclosure] [ GLSA 200909-15 ] Lynx: Arbitrary command execution

From: Alex Legler (a3ligentoo.org)
Date: Sat Sep 12 2009 - 11:29:56 CDT

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Gentoo Linux Security Advisory GLSA 200909-15
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Lynx: Arbitrary command execution
      Date: September 12, 2009
      Bugs: #243058
        ID: 200909-15

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Synopsis
========

An incomplete fix for an issue related to the Lynx URL handler might
allow for 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 < 2.8.6-r4 >= 2.8.6-r4

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

Clint Ruoho reported that the fix for CVE-2005-2929 (GLSA 200511-09)
only disabled the lynxcgi:// handler when not using the advanced mode.

Impact
======

A remote attacker can entice a user to access a malicious HTTP server,
causing Lynx to execute arbitrary commands. NOTE: The advanced mode is
not enabled by default. Successful exploitation requires the
"lynxcgi://" protocol to be registered with lynx on the victim's
system.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Lynx users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose =www-client/lynx-2.8.6-r4

References
==========

  [ 1 ] CVE-2005-2929
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2929
  [ 2 ] CVE-2008-4690
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4690
  [ 3 ] GLSA 200511-09
        http://www.gentoo.org/security/en/glsa/glsa-200511-09.xml

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

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

  http://security.gentoo.org/glsa/glsa-200909-15.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
securitygentoo.org or alternatively, you may file a bug at
https://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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