OpenCMS 7.5.3 Cross Site Scripting

`OpenCMS <= 7.5.3 multiple vulnerabilities  
  
Name: OpenCMS <= 7.5.3 multiple vulnerabilities  
Systems Affected: OpenCMS <= 7.5.3  
Severity: High  
Vendor: http://www.opencms.org  
Advisory: http://antisnatchor.com/opencms_7.5.3_multiple_vulnerabilities  
Author: Michele "antisnatchor" Orru (michele.orru AT antisnatchor DOT com)  
Date: 20110328  
  
I. BACKGROUND  
OpenCMS from Alkacon Software is a professional, easy to use website  
content management system. OpenCms helps content managers worldwide  
to create and maintain beautiful websites fast and efficiently.  
  
II. DESCRIPTION  
Multiple vulnerabilities exist in OpenCMS <= 7.5.3 (latest stable version  
at the time of writing) that could lead to victim browser pwnage, sensitive  
information stealing and cookie stealing.  
  
III. ANALYSIS  
  
a.) Reflected XSS  
Some authenticated resources are vulnerable to Reflected XSS.  
  
The URI /opencms/opencms/system/workplace/commons/report-locks.jsp  
is vulnerable to Reflected XSS in the following parameters:  
includerelated, resourcelist.  
  
A request like the following will display an alert with the number 666:  
  
GET  
/opencms/opencms/system/workplace/commons/report-locks.jsp?resourcelist=null&resource=/demo_de&includerelated=false"><script>alert(666)</script>  
HTTP/1.1  
Host: localhost:8080  
[...]  
  
  
The URI /opencms/opencms/system/workplace/views/explorer/contextmenu.jsp  
is vulnerable too,  
but we should know a valid resource name to exploit it: this is not too  
difficult,  
because knowing the path of an image it would be enough.  
  
A request like the following will display an alert with the number 666:  
  
GET  
/opencms/opencms/system/workplace/views/explorer/contextmenu.jsp?resourcelist=/deco_logo.png&acttarget=514f2"><script>alert(666)</script>  
HTTP/1.1  
Host: localhost:8080  
  
b.) Cookies issued without HttpOnly flag  
This issue is even more dangerous because the application don't  
issue cookies with the HttpOnly flag set: even if there are ways  
to bypass this security measure, it should always be added to prevent  
accessing the cookies from JS.  
  
c.) Various password field with autocomplete enabled  
Last but not least, the main login form (URI /opencms/opencms/system/login/)  
and the change password form (URI  
/opencms/opencms/system/workplace/commons/preferences.jsp)  
have autocomplete enabled: thanks to the presence of XSS, an attacker can  
easily  
steal the input form values if they have been saved by the victim using  
the browser "remember password" mechanisms.  
  
IV. DETECTION  
  
7.5.3 and earlier versions are vulnerable.  
  
V. WORKAROUND  
  
Always escape/sanitize the input that comes from the user, because it can  
be malicious. A good way would be to integrate OWASP ESAPI in OpenCMS, in  
order  
to use all the pre-built functions that mitigate XSS, SQLi, XSRF, and so on.  
  
VI. VENDOR RESPONSE  
  
OpenCms 7.5.4 fixes the issues.  
  
VII. CVE INFORMATION  
  
No CVE at this time.  
  
VIII. DISCLOSURE TIMELINE  
  
20110216 Initial vendor contact  
20110216 Initial vendor response  
20110328 Version 7.5.4 fixes the issues  
20110328 Public disclosure  
  
IX. CREDIT  
  
Michele "antisnatchor" Orru'  
  
X. LEGAL NOTICES  
  
Copyright (c) 2011 Michele "antisnatchor" Orru'  
  
Permission is granted for the redistribution of this alert  
electronically. It may not be edited in any way without mine express  
written consent. If you wish to reprint the whole or any  
part of this alert in any other medium other than electronically,  
please email me for permission.  
  
Disclaimer: The information in the advisory is believed to be accurate  
at the time of publishing based on currently available information. Use  
of the information constitutes acceptance for use in an AS IS condition.  
There are no warranties with regard to this information. Neither the  
author nor the publisher accepts any liability for any direct, indirect,  
or consequential loss or damage arising from use of, or reliance on,  
this information.  
`