[Full-disclosure] iDEFENSE Security Advisory 04.26.05: MySQL MaxDB Webtool Remote 'If' Stack Overflow Vulnerability

From: iDEFENSE Labs (labs-no-reply_at_idefense.com)
Date: 04/26/05

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    Date: Tue, 26 Apr 2005 11:11:02 -0400
To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>, <full-disclosure@lists.grok.org.uk>

    MySQL MaxDB Webtool Remote 'If' Stack Overflow Vulnerability

    iDEFENSE Security Advisory 04.26.05
    www.idefense.com/application/poi/display?id=236&type=vulnerabilities
    April 26, 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, salability 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.

    II. DESCRIPTION

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

    The vulnerabiltiy specifically exists because of a lack of bounds
    checking in the WebDAV functionality of the web tool. When an attacker
    issues an HTTP request with the unlock method, along with a long "If"
    parameter string, a stack-based overflow occurs. The offending code
    follows:

    WDVH_Bool getIfHeader(sapdbwa_HttpRequestP request,
                          WDVH_Char *sIf,
                          WDVH_Int4 len)
    {
    WDVH_Char *temp1, *temp2, *temp4, *temp5;
    WDVH_UInt4 length;
    WDVH_Char temp3[WDVH_MAX_IF_HEADER_LEN];

    if (request==NULL || sIf==NULL)
        return WDVH_False;
      
    strcpy(sIf,"");
    temp4 = (char*)sapdbwa_GetHeader(request,"If");
    if (temp4 != NULL) {
        strcpy(temp3,temp4);

    The variable temp3 is a fixed-length stack buffer. The function
    sapdbwa_GetHeader() returns the user-supplied value for the "If"
    parameter. This user-supplied value is then copied into the fixed-size
    buffer using a strcpy() call. Because there is no boundary checking, it
    is possible to overflow the stack buffer and overwrite stack memory,
    ultimately leading to control of execution flow and execution of
    arbitrary code.

    III. ANALYSIS

    Successful exploitation of the vulnerability could 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 listening on

    public-facing network interfaces.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in MySQL
    MaxDB 7.5.00.23. All versions are suspected vulnerable.

    V. WORKAROUND

    Filter traffic on TCP port 9999 from untrusted hosts destined for the
    MaxDB Webtool server.

    VI. VENDOR RESPONSE

    This vulnerability is fixed in MySQL MaxDB 7.5.00.26 which available for
    download at:

       http://dev.mysql.com/downloads/maxdb/7.5.00.html

    VII. CVE INFORMATION

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

    VIII. DISCLOSURE TIMELINE

    04/25/2005 Initial vendor notification
    04/26/2005 Initial vendor response
    04/26/2005 Coordinated public disclosure

    IX. CREDIT

    iDEFENSE Labs is credited with this discovery.

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

    Free tools, research and upcoming events
    http://labs.idefense.com

    X. LEGAL NOTICES

    Copyright (c) 2005 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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