Boastmachine Cross Site Scripting Vulnerability

2006.05.23
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

Advisory : Cross Site Scripting in Boastmachine (http://boastology.com/) Release Date : 17/05/2005 Last Modified : 17/05/2005 Author : Yunus Emre Yilmaz ( http://yns.zaxaz.com) Application : BoastMachine v3.1 ( maybe older versions) Risk : High Problem : Form action values in admin.php and index.php (maybe other pages) isn't properly sanitized before being returned to page.Form action value is otomatically coming from $_SERVER["PHP_SELF"];.And This is changeable from query string. If I access page like admin.php/XSS $_SERVER["PHP_SELF"] returns as admin.php/XSS.So , an attacker basicly inject malicious HTML/JS codes into page. Proof Of Concept : admin.php/"><script>alert('xss')</script> Solution : Edit the source code , and change it $_SERVER["SCRIPT_NAME"] or filter it before printing in page. Original Advisory : http://yns.zaxaz.com/advisories/bostmachine.txt


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