unp: Arbitrary command execution

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Gentoo Linux Security Advisory                          
GLSA 200801-01
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                                            http://security.gentoo.or
g/
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  Severity: Normal
     Title: unp: Arbitrary command execution
      Date: January 09, 2008
      Bugs: #203106
        ID: 200801-01

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Synopsis
========

unp allows execution of arbitrary code via malicious file
names.

Background
==========

unp is a script for unpacking various file formats.

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

   
------------------------------------------------------------
-------
     Package       /  Vulnerable  /                        
Unaffected
   
------------------------------------------------------------
-------
  1  app-arch/unp      < 1.0.14                          
   >= 1.0.14

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

Erich Schubert from Debian discovered that unp does not
escape file
names properly before passing them to calls of the shell.

Impact
======

A remote attacker could entice a user or automated system to
unpack a
compressed archive with a specially crafted file name,
leading to the
execution of shell commands from within the filename. That
code will be
executed with the privileges of the user running unp.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All unp users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
">=app-arch/unp-1.0.14"

References
==========

  [ 1 ] CVE-2007-6610
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-6610

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

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

  ht
tp://security.gentoo.org/glsa/glsa-200801-01.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
securitygentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2008 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