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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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-----------------
Background
-----------------

Orchard is a free, open source, community-focused content management
system written in ASP.NET platform using the ASP.NET MVC framework. Its
vision is to create shared components for building ASP.NET applications
and extensions, and specific applications that leverage these components
to meet the needs of end-users, scripters, and developers.

------------------------
Software Version
------------------------

The version of Orchard affected by this issue are 1.7.3, 1.8.2 and
1.9.0. Version below 1.7.3 are not affected

---------------
Description
---------------

A persistent XSS vulnerability was discovered in the Users module that
is distributed with the core distribution of the CMS. The issue
potentially allows elevation of privileges by tricking an administrator
to execute some custom crafted script on his behalf. The issue affects
the Username field, since a user is allowed to register a username
containing potentially dangerous characters.

More information can be found here
http://docs.orchardproject.net/Documentation/Patch-20150630

----------------------
Proof of Concept
----------------------

1. Attacker registers a new user account with username e.x
<script>alert("XSS")</script>
2. The administrator attempts to delete the account using the Users core
module.
3. Once the administrator clicks on the "delete" action, the XSS payload
is executed.

-------------
Mitigation
-------------

See http://docs.orchardproject.net/Documentation/Patch-20150630

-----------
Timeline
-----------

2015-06-10 Vulnerability reported to Orchard CMS development team
2015-06-12 Response and issue verification
2015-06-30 Update and patch release
2015-07-06 Public Disclosure

---------
Credits
---------

Reported by Paris Zoumpouloglou of Project Zero labs
(https://projectzero.gr)

-- 
Paris Zoumpouloglou
@pzmini0n

https://projectzero.gr