[NEWS] IBM Net.Data Macro Name Cross-Site Scripting Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 01/28/04

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Date: 28 Jan 2004 17:37:40 +0200

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      IBM Net.Data Macro Name Cross-Site Scripting Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www-3.ibm.com/software/data/net.data/> Net.Data, a full-featured
    and easy to learn scripting language, allows you to create powerful Web
    applications. Net.Data can access data from the most prevalent databases
    in the industry".

    A vulnerability has been identified in IBM Net.Data which can be used by
    attackers to conduct cross-site scripting attacks.

    DETAILS

    Vulnerable Systems:
     * IBM Net.Data version 7 and 7.2, possibly prior

    The vulnerability is caused due to an input validation error in the db2www
    CGI component, since the name of a requested macro file is included in
    "DTWP001E" error messages without sufficient sanitation. This can be
    exploited by constructing a link which includes arbitrary script code. If
    a user is tricked into clicking the link or visiting a malicious website,
    the script code will be executed in the user's browser session in context
    of the affected site.

    Example:
    http://[victim]/cgi-bin/db2www/< scr!pt>alert(document.domain)< /scr!pt>

    (note the word "script" has been replaced with "scr!pt")

    Successful exploitation may result in disclosure of various information
    (e.g. cookie-based authentication information) associated with the site
    running IBM Net.Data, or inclusion of malicious content which the user
    thinks is part of the real website. Other error messages may also be
    affected.

    Workaround
    The vendor recommends that the "DTW_DEFAULT_ERROR_MESSAGE" feature (or
    "DTW_DEFAULT_MACRO" feature on zOS and iServer) is used to ensure that a
    web site reacts in a predictable manner when encountering problems.

    In the Net.Data configuration file "db2www.ini", insert an entry such as:

    DTW_DEFAULT_ERROR_MESSAGE This Web Site is experiencing problems.
    Check back later.

    This will prevent various error messages from being returned to users.

    Time Table
     * 04/11/2003 - Vulnerability discovered
     * 04/11/2003 - Vendor notified
     * 07/11/2003 - Vendor confirms receiving vulnerability report. Report
    will be forwarded to Net.Data team
     * 02/12/2003 - Requests status report from contact person
     * 02/12/2003 - Contact person responds that the Net.Data team will be
    contacted
     * 14/01/2004 - Advisory draft sent to vendor along with set disclosure
    date
     * 14/01/2004 - Contact person replies that the Net.Data team will be
    contacted again
     * 22/01/2004 - Vendor confirms vulnerability and provides solution
     * 26/01/2004 - Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:che@secunia.com> Carsten H.
    Eiram

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