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[gentoo-announce] [ GLSA 200903-24 ] Shadow: Privilege escalation

Posted on 10 March 2009
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 200903-24
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http://security.gentoo.org/
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Severity: High
Title: Shadow: Privilege escalation
Date: March 10, 2009
Bugs: #251320
ID: 200903-24

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Synopsis
========
An insecure temporary file usage in Shadow may allow local users to
gain root privileges.

Background
==========
Shadow is a set of tools to deal with user accounts.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/shadow < 4.1.2.2 >= 4.1.2.2

Description
===========
Paul Szabo reported a race condition in the "login" executable when
setting up tty permissions.

Impact
======
A local attacker belonging to the "utmp" group could use symlink
attacks to overwrite arbitrary files and possibly gain root privileges.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All Shadow users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.1.2.2"

References
==========
[ 1 ] CVE-2008-5394
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5394

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

http://security.gentoo.org/glsa/glsa-200903-24.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 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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