[NT] Chatman Remote DoS (New User Broadcast)

From: SecuriTeam (support_at_securiteam.com)
Date: 10/01/04

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Date: 1 Oct 2004 09:59:57 +0200

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      Chatman Remote DoS (New User Broadcast)
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.vp-soft.com/software/chatman.php> ChatMan provides an
    universal solution for communicating within local area network
    (intranet)."
    A remote attacker can crash ChatMan by sending a packet containing a large
    packet size.

    DETAILS

    Vulnerable Systems:
     * ChatMan version 1.5.1 RC1 and below.

    Each data block exchanged by Chatman is constituted by a 32 bits number
    used to identify the data size. The amount of memory specified by this
    number is immediately allocated but if it is too big (and so allocation
    fails) the program terminates automatically.
    Also if the program uses the TCP protocol is possible to crash any Chatman
    host in the LAN simply sending a "new user" broadcast packet, they will
    automatically connect to the attacker that can passively exploit the bug
    as described previously.

    Proof of Concept Code:
    Proof of Concept code is available at:
    <http://aluigi.altervista.org/poc/chatmanx.zip>
    http://aluigi.altervista.org/poc/chatmanx.zip

    Vendor Status:
    No fix is available. Chatman is no longer supported.

    ADDITIONAL INFORMATION

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

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