[Full-disclosure] [gentoo-announce] [ GLSA 200504-04 ] mit-krb5: Multiple buffer overflows in telnet client

From: Thierry Carrez (koon_at_gentoo.org)
Date: 04/06/05

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    Date: Wed, 06 Apr 2005 13:50:44 +0200
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    Gentoo Linux Security Advisory GLSA 200504-04
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: mit-krb5: Multiple buffer overflows in telnet client
          Date: April 06, 2005
          Bugs: #87145
            ID: 200504-04

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    Synopsis
    ========

    The mit-krb5 telnet client is vulnerable to two buffer overflows, which
    could allow a malicious telnet server operator to execute arbitrary
    code.

    Background
    ==========

    The MIT Kerberos 5 implementation provides a command line telnet client
    which is used for remote login via the telnet protocol.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-crypt/mit-krb5 < 1.3.6-r2 >= 1.3.6-r2

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

    A buffer overflow has been identified in the env_opt_add() function,
    where a response requiring excessive escaping can cause a heap-based
    buffer overflow. Another issue has been identified in the
    slc_add_reply() function, where a large number of SLC commands can
    overflow a fixed size buffer.

    Impact
    ======

    Successful exploitation would require a vulnerable user to connect to
    an attacker-controlled telnet host, potentially executing arbitrary
    code with the permissions of the telnet user on the client.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

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

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.3.6-r2"

    References
    ==========

      [ 1 ] CAN-2005-0468
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468
      [ 2 ] CAN-2005-0469
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
      [ 3 ] MITKRB5-SA-2005-001

    http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-001-telnet.txt

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

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

      http://security.gentoo.org/glsa/glsa-200504-04.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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