full-disclosure - [ GLSA 200711-32 ] Feynmf: Insecure temporary file creation

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Date: Tue, 20 Nov 2007 23:32:28 +0100
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200711-32 ] Feynmf: Insecure temporary
	file creation

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Gentoo Linux Security Advisory                           GLSA 200711-32
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Feynmf: Insecure temporary file creation
      Date: November 20, 2007
      Bugs: #198231
        ID: 200711-32

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Synopsis
========

A vulnerability has been discovered in Feynmf allowing local users to
overwrite arbitrary files via a symlink attack.

Background
==========

Feynmf is a combined LaTeX and Metafont package for easy drawing of
professional quality Feynman (and maybe other) diagrams.

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

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  dev-tex/feynmf      < 1.08-r2                          >= 1.08-r2

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

Kevin B. McCarty discovered that the feynmf.pl script creates a
temporary "properly list" file at the location "$TMPDIR/feynmf$PID.pl",
where $PID is the process ID.

Impact
======

A local attacker could create symbolic links in the directory where the
temporary files are written, pointing to a valid file somewhere on the
filesystem that is writable by the user running Feynmf. When Feynmf
writes the temporary file, the target valid file would then be
overwritten with the contents of the Feynmf temporary file.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Feynmf users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-tex/feynmf-1.08-r2"

References
==========

  [ 1 ] CVE-2007-5940
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5940

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

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

  http://security.gentoo.org/glsa/glsa-200711-32.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 2007 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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