[NT] Easy Chat Server Multiple Vulnerabilities

From: SecuriTeam (support_at_securiteam.com)
Date: 07/04/04

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Date: 4 Jul 2004 20:03:59 +0200

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      Easy Chat Server Multiple Vulnerabilities
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.echatserver.com/> Easy Chat Server is a easy, fast and
    affordable way to host and manage your own real-time communication
    software, it allows friends/colleagues to chat with you through a Web
    Browser (IE, Netscape, Mozilla, Opera etc.) on any computer (Windows,
    Linux, Solaris...) without any special plug-ins or software. It can help
    you setup your community chat rooms, collaborative work sessions or online
    meetings". Easy Chat suffers from vulnerabilities that allow malicious
    users to crash it in more than one way, one of which is the addition of an
    unusually large amount of users.

    DETAILS

    Vulnerable Systems:
     * Easy Char server version 1.2

     * It is possible to crash the server by providing a very long username
    string. The string is not bounds checked and an overly long string will
    bring down the server.
     * The program has no good checks on the users who enter free rooms.
    Therefore it's possible to add an arbitrarily large number of fake users
    to the system eventually causing it to crash.

    The first issue can be tested using the following request:
    GET /chat.ghp?username=aaaa[ 295 of a ]aaaa&password=&room=1&sex=0

    The second can be tested by:
    GET /chat.ghp?username=FakeUser&password=&room=1&sex=0

    Which will create a fake user on the system with the provided password.
    Naturally, issuing many such requests with bogus (perhaps random)
    usernames will eventually cause the server to crash.

    Vendor Status:
    The vendor has been contacted and a fix will be out in the next version of
    the product.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:fdonato@autistici.org>
    Donato Ferrante.

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