[Full-Disclosure] [ GLSA 200410-03 ] NetKit-telnetd: buffer overflows in telnet and telnetd

From: Thierry Carrez (koon_at_gentoo.org)
Date: 10/05/04

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    To: gentoo-announce@lists.gentoo.org
Date: Tue, 05 Oct 2004 20:43:50 +0200

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    Gentoo Linux Security Advisory GLSA 200410-03
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                                                http://security.gentoo.org/
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      Severity: High
         Title: NetKit-telnetd: buffer overflows in telnet and telnetd
          Date: October 05, 2004
          Bugs: #64632
            ID: 200410-03

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    Synopsis
    ========

    Buffer overflows exist in the telnet client and daemon provided by
    netkit-telnetd, which could possibly allow a remote attacker to gain
    root privileges and compromise the system.

    Background
    ==========

    NetKit-telnetd is a standard Linux telnet client and server from the
    NetKit utilities.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-misc/netkit-telnetd <= 0.17-r3 >= 0.17-r4

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

    A possible buffer overflow exists in the parsing of option strings by
    the telnet daemon, where proper bounds checking is not applied when
    writing to a buffer. Additionaly, another possible buffer overflow has
    been found by Josh Martin in the handling of the environment variable
    HOME.

    Impact
    ======

    A remote attacker sending a specially-crafted options string to the
    telnet daemon could be able to run arbitrary code with the privileges
    of the user running the telnet daemon, usually root. Furthermore, an
    attacker could make use of an overlong HOME variable to cause a buffer
    overflow in the telnet client, potentially leading to the local
    execution of arbitrary code.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

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

        # emerge sync

        # emerge -pv ">=net-misc/netkit-telnetd-0.17-r4"
        # emerge ">=net-misc/netkit-telnetd-0.17-r4"

    References
    ==========

      [ 1 ] CVE-2001-0554
            http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0554
      [ 2 ] Debian Bug #264846
            http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=264846

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

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

      http://security.gentoo.org/glsa/glsa-200410-03.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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