Microsoft Skypexspaces - DNS Squatting Web Vulnerability

Document Title:
===============
Microsoft Skypexspaces - DNS Squatting Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2112


Release Date:
=============
2018-01-12


Vulnerability Laboratory ID (VL-ID):
====================================
2112


Common Vulnerability Scoring System:
====================================
6.4


Vulnerability Class:
====================
Insecure Configuration Management


Current Estimated Price:
========================
5.000€ - 10.000€


Product & Service Introduction:
===============================
Microsoft Corporation is an American multinational technology company with headquarters in Redmond, Washington. It develops, manufactures, 
licenses, supports and sells computer software, consumer electronics, personal computers, and services. Its best known software products 
are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers. Its flagship 
hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup. As of 2016, it is the world's largest software maker 
by revenue, and one of the world's most valuable companies. The word "Microsoft" is a portmanteau of microcomputer and software.

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


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


Vulnerability Disclosure Timeline:
==================================
2017-09-27 : Researcher Notification & Coordination (SaifAllah benMassaoud)
2017-09-27 : Vendor Notification (MSRC Team - Microsoft Security Department)
2017-10-10 : Vendor Response/Feedback (MSRC Team - Microsoft Security Department)
2018-01-09 : Vendor Fix/Patch (Microsoft Service Developer Team)
2018-01-10 : Security Acknowledgements  (MSRC Team - Microsoft Security Department)
2018-01-12 : Public Disclosure (Vulnerability Laboratory)



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


Affected Product(s):
====================

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


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


Authentication Type:
====================
No authentication (guest)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Responsible Disclosure Program


Technical Details & Description:
================================
A dns server vulnerability has been discovered in the official Microsoft Skypexspaces online service web-application.
The remote vulnerability allows remote attackers to hijack the microsoft skypexspaces subdomain service web-application 
by a sign up to microsoft azure service. The microsoft Skypexspaces subdomain and azure service is vulnerable to such typ 
of attacks. The dns answer cname performed by the azure app service leads to a takeover of the involved Skypexspaces subddomain.

The issue could allow an attacker to store something malicious by uploading a web page to make a pretty convincing phishing page 
or by running the browser with windows exploits through the application. The issue could allow an attacker to deface the microsoft 
Skypexspaces service web application and can lead to a web-server system compromise at the end. 

The vulnerability is located in the dns configuration of the cname record that points skypexspaces.microsoft.com to skypexspaces.azurewebsites.net. 
Attackers can use microsoft.com domain name to create more effective attacks against users (Accounts & Windows operating system versions etc.).

The security risk of the vulnerability is estimated as high. Exploitation of the vulnerability requires a privileged web-application user account 
and medium user interaction. Successful exploitation of the vulnerability results in dns hijack and webserver or subdomain compromise.

Vulnerable Service(s):
[+] skypexspaces.microsoft.com



Proof of Concept (PoC):
=======================
The dns vulnerability can be exploited by remote attackers with high privilege of the web-application and lhigh or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


--- PoC Session Logs ---
skypexspaces.microsoft.com. 5	IN	CNAME skypexspaces.azurewebsites.net.
skypexspaces.azurewebsites.net.	5 IN	CNAME	waws-prod-sn1-135.vip.azurewebsites.windows.net.
waws-prod-sn1-135.vip.azurewebsites.windows.net. 5 IN CNAME waws-prod-sn1-135.cloudapp.net.


Solution - Fix & Patch:
=======================
2018-01-09 : Vendor Fix/Patch (Microsoft Developer Team - Online Services)



Security Risk:
==============
The security risk of dns squatting vulnerability in the microsoft skypexspaces web-service is estimated as high (CVSS 6.4).


Credits & Authors:
==================
SaifAllah benMassaoud [[email protected]] - @benmassaou - https://www.vulnerability-lab.com/show.php?user=S.AbenMassaoud


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