full-disclosure - [ GLSA 200410-18 ] Ghostscript: Insecure temporary file use in multiple scripts

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From: koon at gentoo.org (Thierry Carrez)
Subject: [ GLSA 200410-18 ] Ghostscript: Insecure temporary file use in multiple
 scripts

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Gentoo Linux Security Advisory                           GLSA 200410-18
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Ghostscript: Insecure temporary file use in multiple
            scripts
      Date: October 20, 2004
      Bugs: #66357
        ID: 200410-18

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Synopsis
========

Multiple scripts in the Ghostscript package are vulnerable to symlink
attacks, potentially allowing a local user to overwrite arbitrary
files with the rights of the user running the script.

Background
==========

Ghostscript is a software package providing an interpreter for the
PostScript language and the PDF file format. It also provides output
drivers for various file formats and printers.

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

    -------------------------------------------------------------------
     Package               /   Vulnerable   /               Unaffected
    -------------------------------------------------------------------
  1  app-text/ghostscript      < 7.07.1-r7                >= 7.07.1-r7
                                                         *>= 7.05.6-r2

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

The pj-gs.sh, ps2epsi, pv.sh and sysvlp.sh scripts create temporary
files in world-writeable directories with predictable names.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
an affected script is called, this would result in the file to be
overwritten with the rights of the user running the script, which could
be the root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

Ghostscript users on all architectures except PPC should upgrade to the
latest version:

    # emerge sync

    # emerge -pv ">=app-text/ghostscript-7.07.1-r7"
    # emerge ">=app-text/ghostscript-7.07.1-r7"

Ghostscript users on the PPC architecture should upgrade to the latest
stable version on their architecture:

    # emerge sync

    # emerge -pv ">=app-text/ghostscript-7.05.6-r2"
    # emerge ">=app-text/ghostscript-7.05.6-r2"

References
==========

  [ 1 ] CAN-2004-0967
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0967

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

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

  http://security.gentoo.org/glsa/glsa-200410-18.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@...too.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/1.0

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