[ GLSA 200409-09 ] MIT krb5: Multiple vulnerabilities

From: Thierry Carrez (koon_at_gentoo.org)
Date: 09/06/04

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    Date: Mon, 06 Sep 2004 10:39:55 +0200
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    Gentoo Linux Security Advisory GLSA 200409-09
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                                                http://security.gentoo.org/
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      Severity: High
         Title: MIT krb5: Multiple vulnerabilities
          Date: September 06, 2004
          Bugs: #62417
            ID: 200409-09

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    Synopsis
    ========

    MIT krb5 contains several double-free vulnerabilities, potentially
    allowing the execution of arbitrary code, as well as a denial of
    service vulnerability.

    Background
    ==========

    MIT krb5 is the free implementation of the Kerberos network
    authentication protocol by the Massachusetts Institute of Technology.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-crypt/mit-krb5 < 1.3.4 >= 1.3.4

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

    The implementation of the Key Distribution Center (KDC) and the MIT
    krb5 library contain double-free vulnerabilities, making client
    programs as well as application servers vulnerable.

    The ASN.1 decoder library is vulnerable to a denial of service attack,
    including the KDC.

    Impact
    ======

    The double-free vulnerabilities could allow an attacker to execute
    arbitrary code on a KDC host and hosts running krb524d or vulnerable
    services. In the case of a KDC host, this can lead to a compromise of
    the entire Kerberos realm. Furthermore, an attacker impersonating a
    legitimate KDC or application server can potentially execute arbitrary
    code on authenticating clients.

    An attacker can cause a denial of service for a KDC or application
    server and clients, the latter if impersonating a legitimate KDC or
    application server.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All mit-krb5 users should upgrade to the latest stable version:

        # emerge sync

        # emerge -pv ">=app-crypt/mit-krb5-1.3.4"
        # emerge ">=app-crypt/mit-krb5-1.3.4"

    References
    ==========

      [ 1 ] MIT krb5 Security Advisory 2004-002

    http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-002-dblfree.txt
      [ 2 ] MIT krb5 Security Advisory 2004-003

    http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt
      [ 3 ] CAN-2004-0642
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642
      [ 4 ] CAN-2004-0643
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643
      [ 5 ] CAN-2004-0644
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0644
      [ 6 ] CAN-2004-0772
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0772

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

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

      http://security.gentoo.org/glsa/glsa-200409-09.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 2004 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/1.0

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