[Full-Disclosure] [ GLSA 200410-13 ] BNC: Input validation flaw

From: Thierry Carrez (koon_at_gentoo.org)
Date: 10/15/04

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    To: gentoo-announce@gentoo.org
Date: Fri, 15 Oct 2004 14:00:32 +0200

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    Gentoo Linux Security Advisory GLSA 200410-13
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: BNC: Input validation flaw
          Date: October 15, 2004
          Bugs: #66912
            ID: 200410-13

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    Synopsis
    ========

    BNC contains an input validation flaw which might allow a remote
    attacker to issue arbitrary IRC related commands.

    Background
    ==========

    BNC is an IRC proxying server

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-irc/bnc < 2.8.9 >= 2.8.9

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

    A flaw exists in the input parsing of BNC where part of the
    sbuf_getmsg() function handles the backspace character incorrectly.

    Impact
    ======

    A remote user could issue commands using fake authentication
    credentials and possibly gain access to scripts running on the client
    side.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All BNC users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=net-irc/bnc-2.8.9"
        # emerge ">=net-irc/bnc-2.8.9"

    References
    ==========

      [ 1 ] BNC Changes
            http://www.gotbnc.com/changes.html#2.8.9

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

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

      http://security.gentoo.org/glsa/glsa-200410-13.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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