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

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Date: Thu, 10 Apr 2008 22:19:11 +0200
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 200804-09 ] am-utils: Insecure temporary
	file creation

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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@...too.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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