[NT] FileZilla Server Terminal Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/08/05

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Date: 8 Nov 2005 10:41:02 +0200

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      FileZilla Server Terminal Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

     <http://filezilla.sourceforge.net/> FileZilla is "a free, open source FTP
    client for Windows. It supports FTP, SFTP, and FTPS (FTP over SSL/TLS).
    The <http://sourceforge.net/projects/filezilla/> FileZilla Server has a
    user interface that is used to configure and monitor the FileZilla
    Server".

    A buffer overflow vulnerability has been discovered in FileZilla server
    terminal program allowing attackers to cause the process initiated by the
    server to crash.

    DETAILS

    Vulnerable Systems:
     * FileZilla Server Terminal version 0.9.4d.

    By sending a long USER FTP command to the FileZilla Server an attacker may
    cause the FileZilla Server Terminal process to crash (the FileZilla Server
    itself does not crash).

    Proof of Concept:
     * Start the FileZilla Server
     * Start the FileZilla Server Terminal and login to the FileZilla Server
    started in step 1
     * Send the following USER commands; "USER A", "USER AA", "USER AAA" etc
    incrementing by one letter ("A") in the command
     * The FileZilla Server Terminal usually crashes between 900 and 3000
    "A"s'

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:inge.henriksen@booleansoft.com> Inge Henriksen.

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