[NT] Flash Messaging Server Crash

From: SecuriTeam (support_at_securiteam.com)
Date: 10/18/04

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Date: 18 Oct 2004 10:13:40 +0200

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      Flash Messaging Server Crash
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.flashmessage.com/overview.cfm> The Flash Messaging System is
    an "easy to use Network Based Communication Program that runs on all kinds
    of Windows computers. All PCs on the network are able to send "Popup"
    messages to each other with the click of the mouse. It is simple,
    efficient, and has many advanced features."

    Due to problems in handling certain input patterns received by clients,
    the server might crash.

    DETAILS

    Vulnerable Systems:
     * Flash Messaging Server version 5.2.0g (rev 1.1.2)

    The network data exchanged between the server and the clients is composed
    by wide chars (16 bits) and the server is not able to handle some of these
    chars. The result is the immediate crash of the server.

    Another minor issue is that clients may ignore the server's SHUTDOWN
    command and in fact any other available command. In fact the connection
    will not be interrupted so the modified clients can continue to stay
    connected and to chat without problems.

    A proof of concept client emulator and data decoder can be found at
    <http://aluigi.altervista.org/poc/flashmsg.zip>
    http://aluigi.altervista.org/poc/flashmsg.zip

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:aluigi@autistici.org> Luigi
    Auriemma.

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