[Full-Disclosure] [gentoo-announce] [ GLSA 200404-09 ] Cross-realm trust vulnerability in Heimdal

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 04/09/04

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    To: gentoo-announce@lists.gentoo.org
Date: Fri, 9 Apr 2004 06:51:30 -0400

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    Gentoo Linux Security Advisory GLSA 200404-09
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                                                 http://security.gentoo.org
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      Severity: Normal
         Title: Cross-realm trust vulnerability in Heimdal

          Date: April 09, 2004
          Bugs: #46590
            ID: 200404-09

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    Synopsis
    ========

    Heimdal contains cross-realm vulnerability allowing someone with
    control over a realm to impersonate anyone in the cross-realm trust
    path.

    Background
    ==========

    Heimdal is a free implementation of Kerberos 5.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
         app-crypt/heimdal <= 0.6.0 >= 0.6.1

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

    Heimdal does not properly perform certain consistency checks for
    cross-realm requests, which allows remote attackers with control of a
    realm to impersonate others in the cross-realm trust path.

    Impact
    ======

    Remote attackers with control of a realm may be able to impersonate
    other users in the cross-realm trust path.

    Workaround
    ==========

    A workaround is not currently known for this issue. All users are
    advised to upgrade to the latest version of the affected package.

    Resolution
    ==========

    Heimdal users should upgrade to version 0.6.1 or later:

        # emerge sync

        # emerge -pv ">=app-crypt/heimdal-0.6.1"
        # emerge ">=app-crypt/heimdal-0.6.1"

    References
    ==========

      [ 1 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0371

    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.

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

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

         http://security.gentoo.org/glsa/glsa-200404-09.xml

    Copyright/License
    ==================
    Copyright 2004 Gentoo Technologies, Inc.

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/1.0

    _______________________________________________
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