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Gentoo Linux Security Advisory                           GLSA 200407-07
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                                            http://security.gentoo.org/ 
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  Severity: Normal
     Title: Shorewall : Insecure temp file handling
      Date: July 08, 2004
      Bugs: #55675
        ID: 200407-07

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Synopsis
========

Shorewall contains a bug in the code handling the creation of temporary
files and directories. This can allow a non-root user to overwrite
arbitrary system files.

Background
==========

Shorewall is a high level tool for configuring Netfilter, the firewall
facility included in the Linux Kernel.

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

    -------------------------------------------------------------------
     Package                 /   Vulnerable   /             Unaffected
    -------------------------------------------------------------------
  1  net-firewall/shorewall      <= 1.4.10c                 >= 1.4.10f

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

Shorewall uses temporary files and directories in an insecure manner. A
local user could create symbolic links at specific locations,
eventually overwriting other files on the filesystem with the rights of
the shorewall process.

Impact
======

An attacker could exploit this vulnerability to overwrite arbitrary
system files with root privileges, resulting in Denial of Service or
further exploitation.

Workaround
==========

There is no known workaround at this time. All users should upgrade to
the latest available version of Shorewall.

Resolution
==========

All users should upgrade to the latest available version of Shorewall,
as follows:

    # emerge sync

    # emerge -pv ">=net-firewall/shorewall-1.4.10f"
    # emerge ">=net-firewall/shorewall-1.4.10f"

References
==========

  [ 1 ] Shorewall Announcement

http://lists.shorewall.net/pipermail/shorewall-announce/2004-June/000 385.html

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

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

    http://security.gentoo.org/glsa/glsa-200407-07.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 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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