Date: Tue, 10 Mar 2009 23:34:59 +0100
From: Pierre-Yves Rofes <py@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200903-24 ] Shadow: Privilege escalation
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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
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An insecure temporary file usage in Shadow may allow local users to
gain root privileges.
Background
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Shadow is a set of tools to deal with user accounts.
Affected packages
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Package / Vulnerable / Unaffected
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1 sys-apps/shadow < 4.1.2.2 >=3D 4.1.2.2
Description
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Paul Szabo reported a race condition in the "login" executable when
setting up tty permissions.
Impact
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A local attacker belonging to the "utmp" group could use symlink
attacks to overwrite arbitrary files and possibly gain root privileges.
Workaround
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There is no known workaround at this time.
Resolution
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All Shadow users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dsys-apps/shadow-4.1.2.2"
References
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[ 1 ] CVE-2008-5394
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-5394
Availability
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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?
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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
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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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