[ GLSA 200502-02 ] UW IMAP: CRAM-MD5 authentication bypass

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200502-02
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: UW IMAP: CRAM-MD5 authentication bypass
      Date: February 02, 2005
      Bugs: #79874
        ID: 200502-02

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Synopsis
========

UW IMAP contains a vulnerability in the code handling CRAM-MD5
authentication allowing authentication bypass.

Background
==========

UW IMAP is the University of Washington IMAP toolkit which includes
POP3 and IMAP daemons.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  net-mail/uw-imap      <= 2004a                           >= 2004b

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

A logic bug in the code handling CRAM-MD5 authentication incorrectly
specifies the condition for successful authentication.

Impact
======

An attacker could exploit this vulnerability to authenticate as any
mail user on a server with CRAM-MD5 authentication enabled.

Workaround
==========

Disable CRAM-MD5 authentication.

Resolution
==========

All UW IMAP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2004b"

References
==========

  [ 1 ] US-CERT VU#702777
        http://www.kb.cert.org/vuls/id/702777

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

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

  http://security.gentoo.org/glsa/glsa-200502-02.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 2005 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/2.0

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