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Gentoo Linux Security Advisory GLSA 200611-01
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http://security.gentoo.org/
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Severity: High
Title: Screen: UTF-8 character handling vulnerability
Date: November 03, 2006
Bugs: #152770
ID: 200611-01

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Synopsis
========

Screen contains an error in its UTF-8 character handling code that
would allow a remote Denial of Service or possibly the remote execution
of arbitrary code.

Background
==========

Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-misc/screen < 4.0.3 >= 4.0.3

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

cstone and Richard Felker discovered a flaw in Screen's UTF-8 combining
character handling.

Impact
======

The vulnerability can be exploited by writing a special string of
characters to a Screen window. A remote attacker could cause a Denial
of Service or possibly execute arbitrary code with the privileges of
the user running Screen through a program being run inside a Screen
session, such as an IRC client or a mail client.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Screen users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/screen-4.0.3"

References
==========

[ 1 ] CVE-2006-4573
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4573

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

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

http://security.gentoo.org/glsa/glsa-200611-01.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 2006 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