[NT] Buffer Overflow in Whisper FTP Surfer

From: SecuriTeam (support_at_securiteam.com)
Date: 07/20/04

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Date: 20 Jul 2004 10:01:01 +0200

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      Buffer Overflow in Whisper FTP Surfer
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.whispertech.com/> Whisper FTP Surfer is "a freeware FTP
    client for Windows". A buffer overflow occurs when trying to open a file
    with a long name from an FTP Server.

    DETAILS

    Vulnerable Systems:
     * Whisper FTP Surfer version 1.0.7

    For common extension (as .txt) FTP Surfer create a temporary file and
    tries to open it. When closing the FTP Surfer, it tries to delete the
    temporary file. The long name of the file added to the name of the
    temporary folder overflows the buffer.

    Proof of concept:
    Create a file with a very long name with the ".txt" extension, put it on
    an FTP Server and try to open it from FTP Surfer, you'll get an error
    message: "Unable to execute program". Then when you close the FTP Surfer
    the EIP will be invalid.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:giocasati@interfree.it>
    Komrade.

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