A new security update has been released for Gentoo Linux - Postfix: Denial of Service. Here the announcement:
Gentoo Linux Security Advisory GLSA 200809-09
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/=
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: Postfix: Denial of Service
Date: September 19, 2008
Bugs: #236453
ID: 200809-09
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D
A memory leak in Postfix might allow local users to cause a Denial of
Service.
Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
-------------------------------------------------------------------=
Package / Vulnerable / Unaffected
-------------------------------------------------------------------=
1 mail-mta/postfix < 2.4.9 >=3D 2.4.=
9
>=3D 2.5.=
5
mail-mta/postfix < 2.5.5 >=3D 2.4.=
9
>=3D 2.5.=
5
Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Allow only trusted users to control delivery to non-Postfix commands.
Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
All Postfix 2.4 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dmail-mta/postfix-2.4.9"
All Postfix 2.5 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dmail-mta/postfix-2.5.5"
References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[ 1 ] CVE-2008-3889
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3889
Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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?
=3D=3D=3D=3D=3D=3D=3D=3D=3D
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
=3D=3D=3D=3D=3D=3D=3D
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
