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

Gentoo Linux Security Advisory GLSA 200904-11
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http://security.gentoo.org/
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Severity: High
Title: Tor: Multiple vulnerabilities
Date: April 08, 2009
Bugs: #250018, #256078, #258833
ID: 200904-11

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Synopsis
========

Multiple vulnerabilities in Tor might allow for heap corruption, Denial
of Service, escalation of privileges and information disclosure.

Background
==========

Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/tor < 0.2.0.34 >= 0.2.0.34

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

* Theo de Raadt reported that the application does not properly drop
privileges to the primary groups of the user specified via the "User"
configuration option (CVE-2008-5397).

* rovv reported that the "ClientDNSRejectInternalAddresses"
configuration option is not always enforced (CVE-2008-5398).

* Ilja van Sprundel reported a heap-corruption vulnerability that
might be remotely triggerable on some platforms (CVE-2009-0414).

* It has been reported that incomplete IPv4 addresses are treated as
valid, violating the specification (CVE-2009-0939).

* Three unspecified vulnerabilities have also been reported
(CVE-2009-0936, CVE-2009-0937, CVE-2009-0938).

Impact
======

A local attacker could escalate privileges by leveraging unintended
supplementary group memberships of the Tor process. A remote attacker
could exploit these vulnerabilities to cause a heap corruption with
unknown impact and attack vectors, to cause a Denial of Service via CPU
consuption or daemon crash, and to weaken anonymity provided by the
service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Tor users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.0.34"

References
==========

[ 1 ] CVE-2008-5397
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5397
[ 2 ] CVE-2008-5398
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5398
[ 3 ] CVE-2009-0414
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0414
[ 4 ] CVE-2009-0936
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0936
[ 5 ] CVE-2009-0937
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0937
[ 6 ] CVE-2009-0938
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0938
[ 7 ] CVE-2009-0939
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0939

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

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

http://security.gentoo.org/glsa/glsa-200904-11.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 2009 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