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HTB22997: XSS in A Really Simple Chat (ARSC)
From: advisory () htbridge ch
Date: Wed, 1 Jun 2011 14:10:31 +0200 (CEST)

Vulnerability ID: HTB22997
Reference: http://www.htbridge.ch/advisory/xss_in_a_really_simple_chat_arsc.html
Product: A Really Simple Chat (ARSC)
Vendor: http://www.reallysimplechat.org/ ( http://www.reallysimplechat.org/ ) 
Vulnerable Version: 3.3-rc2
Vendor Notification: 12 May 2011 
Vulnerability Type: XSS (Cross Site Scripting)
Risk level: Medium 
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ ) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.
The vulnerability exists due to failure in the "dereferer.php" script to properly sanitize user-supplied input in 
"arsc_link" variable.
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based 
auwhentication credentials, disclosure or modification of sensitive data.
The following PoC is available:

http://[host]/base/dereferer.php?arsc_link=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E




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