[ GLSA 200501-02 ] a2ps: Insecure temporary files handling
From: Thierry Carrez (koon_at_gentoo.org)
Date: 01/04/05
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Date: Tue, 04 Jan 2005 22:33:02 +0100 To: gentoo-announce@lists.gentoo.org
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Gentoo Linux Security Advisory GLSA 200501-02
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http://security.gentoo.org/
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Severity: Normal
Title: a2ps: Insecure temporary files handling
Date: January 04, 2005
Bugs: #75784
ID: 200501-02
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Synopsis
========
The fixps and psmandup scripts in the a2ps package are vulnerable to
symlink attacks, potentially allowing a local user to overwrite
arbitrary files.
Background
==========
a2ps is an Any to Postscript filter that can convert to Postscript from
many filetypes. fixps is a script that fixes errors in Postscript
files. psmandup produces a Postscript file for printing in manual
duplex mode.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-text/a2ps < 4.13c-r2 >= 4.13c-r2
Description
===========
Javier Fernandez-Sanguino Pena discovered that the a2ps package
contains two scripts that create insecure temporary files (fixps and
psmandup).
Impact
======
A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
fixps or psmandup is executed, this would result in the file being
overwritten with the rights of the user running the utility.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All a2ps users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-text/a2ps-4.13c-r2"
References
==========
[ 1 ] Secunia SA13641
http://secunia.com/advisories/13641/
[ 2 ] CAN-2004-1170
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1170
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200501-02.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 2004 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/2.0
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