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Gentoo Linux Security Advisory                           GLSA 200901-13
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Pidgin: Multiple vulnerabilities
      Date: January 20, 2009
      Bugs: #230045, #234135
        ID: 200901-13

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Synopsis
========

Multiple vulnerabilities have been discovered in Pidgin, allowing for
remote arbitrary code execution, Denial of Service and service
spoofing.

Background
==========

Pidgin (formerly Gaim) is an instant messaging client for a variety of
instant messaging protocols. It is based on the libpurple instant
messaging library.

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

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  net-im/pidgin       < 2.5.1                              >= 2.5.1

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

Multiple vulnerabilities have been discovered in Pidgin and the
libpurple library:

* A participant to the TippingPoint ZDI reported multiple integer
  overflows in the msn_slplink_process_msg() function in the MSN
  protocol implementation (CVE-2008-2927).

* Juan Pablo Lopez Yacubian is credited for reporting a
  use-after-free flaw in msn_slplink_process_msg() in the MSN protocol
  implementation (CVE-2008-2955).

* The included UPnP server does not limit the size of data to be
  downloaded for UPnP service discovery, according to a report by
  Andrew Hunt and Christian Grothoff (CVE-2008-2957).

* Josh Triplett discovered that the NSS plugin for libpurple does not
  properly verify SSL certificates (CVE-2008-3532).

Impact
======

A remote attacker could send specially crafted messages or files using
the MSN protocol which could result in the execution of arbitrary code
or crash Pidgin. NOTE: Successful exploitation might require the
victim's interaction. Furthermore, an attacker could conduct
man-in-the-middle attacks to obtain sensitive information using bad
certificates and cause memory and disk resources to exhaust.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Pidgin users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-im/pidgin-2.5.1"

References
==========

  [ 1 ] CVE-2008-2927
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2927
  [ 2 ] CVE-2008-2955
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2955
  [ 3 ] CVE-2008-2957
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2957
  [ 4 ] CVE-2008-3532
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3532

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

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

  http://security.gentoo.org/glsa/glsa-200901-13.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