[Full-Disclosure] iDEFENSE Security Advisory 10.06.04a: MySQL MaxDB Web Agent WebDBM Server Name Denial of Service Vulnerability

idlabs-advisories_at_idefense.com
Date: 10/06/04

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Date: Wed, 6 Oct 2004 11:40:13 -0400

    MySQL MaxDB Web Agent WebDBM Server Name Denial of Service Vulnerability

    iDEFENSE Security Advisory 10.06.04a:
    www.idefense.com/application/poi/display?id=150&type=vulnerabilities
    October 6, 2004

    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.

    II. DESCRIPTION

    Remote exploitation of an input validation error in MySQL MaxDB could
    allow attackers to trigger a denial of service condition.

    The problem specifically exists due to improper input validation of a
    user-supplied variable in the IsAscii7() function. Remote attackers can
    send a specially crafted HTTP request to webdbm with the 'Server' value
    containing ASCII values above 0x7F to cause an assert directive to fail,
    resulting in a DoS condition.

        wahttp:
        ToolsCommon/Tools_DynamicUTF8String.hpp:249:
        Tools_DynamicUTF8String::Tools_DynamicUTF8String(const SAPDB_Char *)
        Assertion `IsAscii7(src)' failed.

        Program received signal SIGABRT, Aborted.
        [Switching to Thread 10251 (LWP 12706)]
        0x40429781 in kill () from /lib/libc.so.6

    III. ANALYSIS

    Successful exploitation allows remote attackers to trigger a denial of
    service condition on the web agent component of MaxDB.

    IV. DETECTION

    iDEFENSE has confirmed that SAP DB version 7.5 for both Linux and
    Windows is vulnerable.

    V. WORKAROUND

    Use of an ingress perimeter firewall filter can help detect and mitigate
    the risk of attack.

    VI. VENDOR RESPONSE

    "A solution for the issue is available with MaxDB 7.5.00.18."

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    names CAN-2004-0931 to these issues. This is a candidate for inclusion
    in the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    VIII. DISCLOSURE TIMELINE

    08/16/2004 Initial vendor notification
    08/16/2004 iDEFENSE clients notified
    08/19/2004 Initial vendor response
    10/06/2004 Coordinated public disclosure

    IX. CREDIT

    Patrik Karlsson (cqure.net) is credited with this discovery.

    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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