A new security update has been released for Gentoo Linux - Dovecot: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200812-16
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http://security.gentoo.org/
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Severity: Normal
Title: Dovecot: Multiple vulnerabilities
Date: December 14, 2008
Bugs: #240409, #244962, #245316
ID: 200812-16

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Synopsis
========

Multiple vulnerabilities were found in the Dovecot mailserver.

Background
==========

Dovecot is an IMAP and POP3 server written with security primarily in
mind.

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

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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-mail/dovecot < 1.1.7-r1 >= 1.1.7-r1

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

Several vulnerabilities were found in Dovecot:

* The "k" right in the acl_plugin does not work as expected
(CVE-2008-4577, CVE-2008-4578)

* The dovecot.conf is world-readable, providing improper protection
for the ssl_key_password setting (CVE-2008-4870)

* A permanent Denial of Service with broken mail headers is possible
(CVE-2008-4907)

Impact
======

These vulnerabilities might allow a remote attacker to cause a Denial
of Service, to circumvent security restrictions or allow local
attackers to disclose the passphrase of the SSL private key.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Dovecot users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/dovecot-1.1.7-r1"

Users should be aware that dovecot.conf will still be world-readable
after the update. If employing ssl_key_password, it should not be used
in dovecot.conf but in a separate file which should be included with
"include_try".

References
==========

[ 1 ] CVE-2008-4577
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4577
[ 2 ] CVE-2008-4578
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4578
[ 3 ] CVE-2008-4870
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4870
[ 4 ] CVE-2008-4907
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4907

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

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

http://security.gentoo.org/glsa/glsa-200812-16.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 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