Gentoo: GLSA-200809-09: Postfix: Denial of Service
Summary
Gentoo Linux Security Advisory GLSA 200809-09
https://security.gentoo.org/
Severity: Normal
Title: Postfix: Denial of Service
Date: September 19, 2008
Bugs: #236453
ID: 200809-09
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
==========
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:
https://security.gentoo.org/glsa/200809-09
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
https://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.
https://creativecommons.org/licenses/by-sa/2.5/
Resolution
References
Availability
Concerns
![Dist Gentoo](/images/distros/dist-gentoo.png)