[Full-Disclosure] [ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in krb5_aname_to_localname

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 06/29/04

  • Next message: Kurt Lieber: "[ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in krb5_aname_to_localname" 
    To: gentoo-announce@gentoo.org
Date: Tue, 29 Jun 2004 16:23:42 +0000

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    Gentoo Linux Security Advisory GLSA 200406-21
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                                                http://security.gentoo.org/
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      Severity: High
         Title: mit-krb5: Multiple buffer overflows in
                krb5_aname_to_localname
          Date: June 29, 2004
          Bugs: #52744
            ID: 200406-21

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    Synopsis
    ========

    mit-krb5 contains multiple buffer overflows in the function
    krb5_aname_to_localname(). This could potentially lead to a complete
    remote system compromise.

    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 <= 1.3.3 >= 1.3.3-r1

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

    The library function krb5_aname_to_localname() contains multiple buffer
    overflows. This is only exploitable if explicit mapping or rules-based
    mapping is enabled. These are not enabled as default.

    With explicit mapping enabled, an attacker must authenticate using a
    principal name listed in the explicit mapping list.

    With rules-based mapping enabled, an attacker must first be able to
    create arbitrary principal names either in the local realm Kerberos
    realm or in a remote realm from which the local realm's service are
    reachable by cross-realm authentication.

    Impact
    ======

    An attacker could use these vulnerabilities to execute arbitrary code
    with the permissions of the user running mit-krb5, which could be the
    root user.

    Workaround
    ==========

    There is no known workaround at this time. All users are encouraged to
    upgrade to the latest available version.

    Resolution
    ==========

    mit-krb5 users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=app-crypt/mit-krb5-1.3.3-r1"
        # emerge ">=app-crypt/mit-krb5-1.3.3-r1"

    References
    ==========

      [ 1 ] CAN-2004-0523
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523
      [ 2 ] MIT krb5 Security Advisory
            http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt

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

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

         http://security.gentoo.org/glsa/glsa-200406-21.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 Technologies, 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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