SEC Consult SA-20130311-0 :: Persistent cross-site scripting in jforum

[SEC Consult Vulnerability Lab <research () sec-consult com>]

SEC Consult Vulnerability Lab Security Advisory < 20130311-0 >
=======================================================================
              title: Persistent cross-site scripting vulnerability
            product: jforum
 vulnerable version: 2.1.9
      fixed version: -
             impact: medium
           homepage: http://jforum.net/
              found: 2012-09-20
                CVE: 
                 by: A. Antukh
                     SEC Consult Vulnerability Lab 
                     https://www.sec-consult.com
=======================================================================

Vendor description:
-------------------
jforum is a powerful and robust discussion board system implemented in Java.

"jforum is a discussion board software - a forum - widely known for half a
decade already. It powers many big forums around the globe, including
Electronic Arts' gaming forums, JavaRanch (one of the biggest and oldest Java
communities), GUJ (the biggest Java development community for Portuguese
speakers). It is an Open Source project, maintained by serious developers."

Source: http://jforum.net/contact.jsp


Vulnerability overview/description:
-----------------------------------
A module "pm" provided in the standard installation of jforum includes the
action "sendSave", which suffers from a persistent cross-site scripting
vulnerability due to insufficient validation of user supplied data.

An authenticated user is able to perform cross-site scripting attacks e.g.
create relogin trojan horses or steal session cookies in the context of the
affected website that uses a vulnerable version of jforum.


Proof of concept:
-----------------
The vulnerability is exploited due to improper validation of a certain parameter.
PoC URL has been removed as no vendor patch is available.


Vulnerable / tested versions:
-----------------------------
The vulnerability is verified to exist in 2.1.9 version of jforum which is the 
most recent at the moment of writing the advisory.


Fixed version:
--------------
No patch available.


Vendor contact timeline:
------------------------
2012-11-15: Contacted vendor through rafael () insanecorp com
2012-11-15: Initial vendor response - issues will be verified
2012-11-20: Under investigation / Being fixed in main codeline
2013-02-28: Vendor notification about advisory release on 2013-03-08 according to
            the SEC Consult responsible disclosure policy.
2013-03-05: Vendor agrees with dates of publishing the advisory, will maybe
            supply patch in the future (does currently not work on project)
2013-03-11: Public release of SEC Consult advisory


Workaround:
-----------
No workaround available


Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm


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EOF A. Antukh / @2013

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