[NT] NetFile FTP Denial of Service (Nonexisting Username)

From: SecuriTeam (support_at_securiteam.com)
Date: 04/21/04

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    To: list@securiteam.com
    Date: 21 Apr 2004 19:07:02 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      NetFile FTP Denial of Service (Nonexisting Username)


    About <http://www.fastream.com/netfileserver.htm> NETFile: "Secure,
    multi-threaded FTP/HTTP server combined, featuring automatic virtual
    links, U/D ratios, quotas, authentication and extremely fast directory and
    file caches. Other features include: User and group permissions with
    permissions for all standard FTP and HTTP commands. Serving from behind
    NAT/PAT. HTTP file uploading and management. Free for personal use;
    professional license is required for commercial usage".

    By sending a crafted USER and PASS strings an attacker can crash the FTP


    Vulnerable Systems:
     * Net File version 6.5.1 and prior

    Immune Systems:
     * Net File version

    The program is unable to manage nonexistent user name in the login
    procedure. To crash the server simply send request like this:

    USER anUsername
    PASS aPassword

    If the user anUsername does not exist in the system, the server can be

    Vendor Status:
    Bug fixed in the version that can be obtained from the vendor's
    website at: <http://www.fastream.com/netfileserver.htm>


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


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