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

From: Sune Kloppenborg Jeppesen (jaervosz_at_gentoo.org)
Date: 02/02/05

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    To: gentoo-announce@gentoo.org
Date: Wed, 2 Feb 2005 11:24:09 +0100

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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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