[Full-disclosure] [ GLSA 200809-09 ] Postfix: Denial of Service

[Pierre-Yves Rofes]

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Gentoo Linux Security Advisory                           GLSA 200809-09
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                                              http://security.gentoo.org/
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    Severity: Normal
       Title: Postfix: Denial of Service
        Date: September 19, 2008
        Bugs: #236453
          ID: 200809-09

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Synopsis
========

A memory leak in Postfix might allow local users to cause a Denial of
Service.

Background
==========

Postfix is Wietse Venema's mailer that attempts to be fast, easy to
administer, and secure, as an alternative to the widely-used Sendmail
program.

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

      -------------------------------------------------------------------
       Package           /  Vulnerable  /                     Unaffected
      -------------------------------------------------------------------
    1  mail-mta/postfix       < 2.4.9                           >= 2.4.9
                                                                >= 2.5.5
       mail-mta/postfix       < 2.5.5                           >= 2.4.9
                                                                >= 2.5.5

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

It has been discovered than Postfix leaks an epoll file descriptor when
executing external commands, e.g. user-controlled $HOME/.forward or
$HOME/.procmailrc files. NOTE: This vulnerability only concerns Postfix
instances running on Linux 2.6 kernels.

Impact
======

A local attacker could exploit this vulnerability to reduce the
performance of Postfix, and possibly trigger an assertion, resulting in
a Denial of Service.

Workaround
==========

Allow only trusted users to control delivery to non-Postfix commands.

Resolution
==========

All Postfix 2.4 users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=mail-mta/postfix-2.4.9"

All Postfix 2.5 users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=mail-mta/postfix-2.5.5"

References
==========

    [ 1 ] CVE-2008-3889
          http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3889

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

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

    http://security.gentoo.org/glsa/glsa-200809-09.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 at 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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