full-disclosure - [ GLSA 200410-25 ] Netatalk: Insecure tempfile handling in etc2ps.sh

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Message-ID: <1098720379.28666.1.camel@tomservo.rh.rit.edu>
From: lewk at gentoo.org (Luke Macken)
Subject: [ GLSA 200410-25 ] Netatalk: Insecure tempfile handling in
 etc2ps.sh

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Gentoo Linux Security Advisory                           GLSA 200410-25
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Netatalk: Insecure tempfile handling in etc2ps.sh
      Date: October 25, 2004
      Bugs: #66370
        ID: 200410-25

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Synopsis
========

The etc2ps.sh script, included in the Netatalk package, is vulnerable
to symlink attacks, potentially allowing a local user to overwrite
arbitrary files with the rights of the user running the utility.

Background
==========

Netatalk is a kernel level implementation of the AppleTalk Protocol
Suite, which allows Unix hosts to act as file, print, and time servers
for Apple computers. It includes several script utilities, including
etc2ps.sh.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-fs/netatalk     < 1.6.4-r1                        >= 1.6.4-r1

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

The etc2ps.sh script creates 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
etc2ps.sh is executed, this would result in the file being overwritten
with the rights of the user running the utility, which could be the
root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Netatalk users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-fs/netatalk-1.6.4-r1"
    # emerge ">=net-fs/netatalk-1.6.4-r1"

References
==========

  [ 1 ] CAN-2004-0974
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0974

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

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

  http://security.gentoo.org/glsa/glsa-200410-25.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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