[ GLSA 200407-07 ] Shorewall : Insecure temp file handling

[Thierry Carrez <koon () gentoo org>]

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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/000385.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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