[ GLSA 200804-09 ] am-utils: Insecure temporary file creation

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200804-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: am-utils: Insecure temporary file creation
      Date: April 10, 2008
      Bugs: #210158
        ID: 200804-09

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Synopsis
========

am-utils creates temporary files insecurely allowing local users to
overwrite arbitrary files via a symlink attack.

Background
==========

am-utils is a collection of utilities for use with the Berkeley
Automounter.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-fs/am-utils       < 6.1.5                            >= 6.1.5

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

Tavis Ormandy discovered that, when creating temporary files, the
'expn' utility does not check whether the file already exists.

Impact
======

A local attacker could exploit the vulnerability via a symlink attack
to overwrite arbitrary files.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All am-utils users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-fs/am-utils-6.1.5"

References
==========

  [ 1 ] CVE-2008-1078
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1078

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

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

  http://security.gentoo.org/glsa/glsa-200804-09.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 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
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