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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