iDEFENSE Security Advisory 01.13.05: MySQL MaxDB WebAgent websql logon Buffer Overflow Vulnerability

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Date: 01/13/05

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    MySQL MaxDB WebAgent websql logon Buffer Overflow Vulnerability

    iDEFENSE Security Advisory 01.13.05
    www.idefense.com/application/poi/display?id=181&type=vulnerabilities
    January 13, 2005

    I. BACKGROUND

    MaxDB by MySQL is a re-branded and enhanced version of SAP DB, SAP AG's
    open source database. MaxDB is a heavy-duty, SAP-certified open source
    database that offers high availability, scalability and a comprehensive
    feature set. MaxDB complements the MySQL database server, targeted for
    large mySAP ERP environments and other applications that require maximum
    enterprise-level database functionality.

       http://www.mysql.com/products/maxdb/

    II. DESCRIPTION

    Remote exploitation of a stack based buffer overflow vulnerability in
    MySQL MaxDB could allow attackers to execute arbitrary code.

    The vulnerability specifically exists due to a lack of bounds checking
    in the websql CGI application. In this case, the value of the password
    parameter is converted to unicode and then copied to the stack. The
    resulting overflow can overwrite the saved values for eip and ebp if
    supplied with a 294 byte value. The stored register values are
    overwritten with portions of the unicode copy of the string which may be

    leveraged to execute arbitrary code with SYSTEM privileges. A simple
    overwrite with a long password value will result in the following
    debugger output:

    Program received signal SIGSEGV, Segmentation fault.
    [Switching to thread 328.0xc80]
    0x00410041 in ?? ()
    (gdb) bt
    #0 0x00410041 in ?? ()
    #1 0x00410041 in ?? ()
    #2 0x00420042 in ?? ()
    #3 0x00430043 in ?? ()
    #4 0x00440044 in ?? ()
    (gdb) i r
    eax 0x0 0
    ecx 0x440044 4456516
    edx 0x440044 4456516
    ebx 0x1a789e0 27757024
    esp 0x1559490 0x1559490
    ebp 0x410041 0x410041
    esi 0x1a72190 27730320
    edi 0x1a3d2d4 27513556
    eip 0x410041 0x410041

    III. ANALYSIS

    Successful exploitation of the vulnerability can allow remote attackers
    to execute code with SYSTEM privileges. Note that the vulnerability is
    in the web administration service which should be configured to not
    allow connections from untrusted hosts or listen on public facing
    network interfaces.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in MySQL
    MaxDB 7.5.00.

    V. WORKAROUND

    Employ firewalls, access control lists or other TCP/UDP restriction
    mechanism to limit access to administrative systems and services.

    VI. VENDOR RESPONSE

    The vulnerability has been addressed in MaxDB 7.5.00.18.

    Further details are available at:
    http://www.sapdb.org/webpts?wptsdetail=yes&ErrorType=0&ErrorID=1131190

    VII. CVE INFORMATION

    A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
    been assigned yet.

    VIII. DISCLOSURE TIMELINE

    12/22/2004 Initial vendor notification
    12/27/2004 Initial vendor response
    01/13/2005 Public disclosure

    IX. CREDIT

    The discoverer of this vulnerability wishes to remain anonymous.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    X. LEGAL NOTICES

    Copyright (c) 2004 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert
    electronically. It may not be edited in any way without the express
    written consent of iDEFENSE. If you wish to reprint the whole or any
    part of this alert in any other medium other than electronically, please
    email customerservice@idefense.com for permission.

    Disclaimer: The information in the advisory is believed to be accurate
    at the time of publishing based on currently available information. Use
    of the information constitutes acceptance for use in an AS IS condition.
    There are no warranties with regard to this information. Neither the
    author nor the publisher accepts any liability for any direct, indirect,
    or consequential loss or damage arising from use of, or reliance on,
    this information.

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