[ GLSA 200503-36 ] netkit-telnetd: Buffer overflow

From: Thierry Carrez (koon_at_gentoo.org)
Date: 03/31/05

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    Date: Thu, 31 Mar 2005 13:28:58 +0200
To: gentoo-announce@robin.gentoo.org

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    Gentoo Linux Security Advisory GLSA 200503-36
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: netkit-telnetd: Buffer overflow
          Date: March 31, 2005
          Bugs: #87211
            ID: 200503-36

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    Synopsis
    ========

    The netkit-telnetd telnet client is vulnerable to a buffer overflow,
    which could allow a malicious telnet server operator to execute
    arbitrary code.

    Background
    ==========

    netkit-telnetd provides standard Linux telnet client and server.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-misc/netkit-telnetd < 0.17-r6 >= 0.17-r6

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

    A buffer overflow has been identified in the slc_add_reply() function
    of netkit-telnetd client, where a large number of SLC commands can
    overflow a fixed size buffer.

    Impact
    ======

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

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All netkit-telnetd users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=net-misc/netkit-telnetd-0.17-r6"

    References
    ==========

      [ 1 ] CAN-2005-0469
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
      [ 2 ] iDEFENSE Advisory 03-28-05

    http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities

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

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

      http://security.gentoo.org/glsa/glsa-200503-36.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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