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Date: Wed, 16 Aug 2017 13:39:30 +0200
From: Vulnerability Lab <>
Subject: Microsoft Resnet - DNS Configuration Web Vulnerability

Document Title:
Microsoft Resnet - DNS Configuration Web Vulnerability

References (Source):


Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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: )

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:

Affected Product(s):

Exploitation Technique:

Severity Level:

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 to "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):

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 <<>>
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55595
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
;		IN	A

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:
Vulnerability Laboratory [Core Research Team] S.AbenMassaoud []

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