[ GLSA 200904-11 ] Tor: Multiple vulnerabilities

[Robert Buchholz <rbu () gentoo org>]

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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

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