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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
=================
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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@xxxxxxxxxx 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
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