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[FD] Microsoft Resnet - DNS Configuration Web Vulnerability

Document Title:
===============
Microsoft Resnet - DNS Configuration Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2087

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


Release Date:
=============
2017-08-16


Vulnerability Laboratory ID (VL-ID):
====================================
2087


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


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


Current Estimated Price:
========================
2.000€ - 3.000€


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 configuration 
ulnerability in the official Microsoft Resnet online service web-application.


Vulnerability Disclosure Timeline:
==================================
2017-06-16: Researcher Notification & Coordination (SaifAllah benMassaoud)
2017-06-16: Vendor Notification (Security Department)
2017-07-07: Vendor Fix/Patch (Service Developer Team)
2017-08-15: Security Acknowledgements (Security Department)
2017-08-16: Public Disclosure (Vulnerability Laboratory)


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


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

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


Severity Level:
===============
High


Technical Details & Description:
================================
A dns vulnerability has been discovered in the official Microsoft Resnet online 
service web-application.
The remote vulnerability allows remote attacker to hijack the inactive 
Microsoft Resnet subdomain service web-application 
by a sign up to microsoft azure service. Afterwards serve content for the proof 
local. The microsoft resnet subdomain and 
azure service is vulnerable to such typ of attacks. The dns answer cname 
performed by the azure app service and lead to 
a take over of the involved resnet subddomain.

The issue could allow an attacker to store something malicious by uploading a 
web page to make a pretty convincing phishing page.
The issue could allow an attacker to deface the microsoft resnet service web 
application and web-server system. The problematic 
allows an attacker to make inject codes with persistent attack vector.

The vulnerability is located in the dns configuration of the cname record that 
points resnet.microsoft.com to
resnetportal-prod.azurewebsites.net "Microsoft Azure app service ", but 
microsoft has not yet configuared azure to 
recognize it because the service is inactive.

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

Vulnerable Service(s):
[+] resnet.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 ---
- DNS Record : 
; <<>> DiG 9.7.0-P1 <<>> resnet.microsoft.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55595
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
-
;; QUESTION SECTION:
;resnet.microsoft.com.          IN      A
-
;; ANSWER SECTION:
resnet.microsoft.com.   5       IN      CNAME   
resnetportal-prod.azurewebsites.net.
resnetportal-prod.azurewebsites.net. 5 IN CNAME 
waws-prod-mwh-001.vip.azurewebsites.windows.net.
waws-prod-mwh-001.vip.azurewebsites.windows.net. 5 IN CNAME 
waws-prod-mwh-001.cloudapp.net.
waws-prod-mwh-001.cloudapp.net. 5 IN    A       13.66.226.80


Solution - Fix & Patch:
=======================
2017-07-07: Vendor Fix/Patch (Microsoft Developer Team - Online Services)


Security Risk:
==============
The security risk of dns vulnerability in the microsoft resnet service is 
estimated as high (CVSS 6.4)


Credits & Authors:
==================
S.AbenMassaoud [saifmassaoudi18@xxxxxxxxx] - 
https://www.vulnerability-lab.com/show.php?user=S.AbenMassaoud


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