[NT] Raknet Denial of Service

From: SecuriTeam (support_at_securiteam.com)
Date: 06/09/05

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Date: 9 Jun 2005 11:32:26 +0200

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      Raknet Denial of Service
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.rakkarsoft.com> Raknet is a multi-license (GPL, shareware and
    commercial) network library for games developed by
    <http://www.rakkarsoft.com> Rakkarsoft. It has been used in many open and
    closed source games like those developed by <http://www.n-fusion.com>
    nFusion.
    Raknet based games vulnerable to denial of service when server receives
    maliciously crafted UDP packet.

    DETAILS

    Vulnerable Systems:
     * Raknet network library versions 2.33 and prior (before 30 May 2005).

    Immune Systems:
     * Raknet network library version 2.33 (05/30/2005) version not changed.

    An UDP packet of 0 bytes is able to freeze the game server. The problem is
    that when an empty packet is received the server should close the socket
    and return to the main menu (the first bug) but before doing that it
    enters in an endless loop that executes Sleep(10) until the main thread is
    active (but never terminates).

    Proof of concept:
     <http://aluigi.altervista.org/poc/rakzero.zip>
    http://aluigi.altervista.org/poc/rakzero.zip

    Patch Availability:
     <http://www.rakkarsoft.com/#Downloads> Version 2.33 (05/30/2005).
    The version number has not been changed so be sure to have the patched
    version released the 30 May 2005 or later.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:aluigi@autistici.org> Luigi
    Auriemma.
    The original article can be found at: <http://aluigi.altervista.org>
    http://aluigi.altervista.org

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