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XSS vulnerability in Diem



Vulnerability ID: HTB22459
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_diem_1.html
Product: Diem
Vendor: Diem team
Vulnerable Version: 5.1.2 and Probably Prior Versions
Vendor Notification: 29 June 2010 
Vulnerability Type: XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the dmCore script to properly sanitize user-supplied input in "text" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

http://host/admin.php/+/dmCore/markdown?dm_cpi=0&dm_xhr=1&text=title";><script>alert(document.cookie)<%2Fscript>