GLSA 200909-15 Lynx: Arbitrary command execution
Posted on: 09/12/2009 07:50 PM

A new security update has been released for Gentoo Linux - Lynx: Arbitrary command execution. Here the announcement:

Gentoo Linux Security Advisory GLSA 200909-15
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Normal
Title: Lynx: Arbitrary command execution
Date: September 12, 2009
Bugs: #243058
ID: 200909-15

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D

An incomplete fix for an issue related to the Lynx URL handler might
allow for the remote execution of arbitrary commands.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 www-client/lynx lt; 2.8.6-r4 gt;=3D 2.8.6-r4

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is no known workaround at this time.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

All Lynx users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose =3Dwww-client/lynx-2.8.6-r4

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
https://bugs.gentoo.org.

License
=3D=3D=3D=3D=3D=3D=3D

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



Printed from Linux Compatible (http://www.linuxcompatible.org/news/story/glsa_200909_15_lynx_arbitrary_command_execution.html)