Gentoo: Netpbm Arbitrary code execution in pstopnm
Posted by Benjamin D. Thomas   
Gentoo The pstopnm utility, part of the Netpbm tools, contains a vulnerability which can potentially result in the execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200508-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Netpbm: Arbitrary code execution in pstopnm
      Date: August 05, 2005
      Bugs: #100398
        ID: 200508-04

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Synopsis
========

The pstopnm utility, part of the Netpbm tools, contains a vulnerability
which can potentially result in the execution of arbitrary code.

Background
==========

Netpbm is a package of 220 graphics programs and a programming
libraries, including pstopnm. pstopnm is a tool which converts
PostScript files to PNM image files.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  media-libs/netpbm       < 10.28                          >= 10.28

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

Max Vozeler reported that pstopnm calls the GhostScript interpreter on
untrusted PostScript files without specifying the -dSAFER option, to
convert a PostScript file into a PBM, PGM, or PNM file.

Impact
======

An attacker could craft a malicious PostScript file and entice a user
to run pstopnm on it, resulting in the execution of arbitrary commands
with the permissions of the user running pstopnm.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Netpbm users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/netpbm-10.28"

References
==========

  [ 1 ] Secunia Advisory SA16184
        http://secunia.com/advisories/16184/

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

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

  http://security.gentoo.org/glsa/glsa-200508-04.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 2005 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