Document Title: =============== Microsoft Skypexspaces - DNS Squatting Web Vulnerability Date: ===== 2018-01-12 References: =========== https://www.vulnerability-lab.com/get_content.php?id=2112 VL-ID: ===== 2112 Common Vulnerability Scoring System: ==================================== 6.4 Vulnerability Class: ==================== Insecure Configuration Management 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: ========= The vulnerability laboratory core research team discovered a dns vulnerability in the official Microsoft Skypexspaces online service web-application. Report-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) Status: ======== Published Affected Products: ================== Exploitation-Technique: ======================= Remote Severity: ========= High Details: ======== 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: ================= 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: ========= 2018-01-09 : Vendor Fix/Patch (Microsoft Developer Team - Online Services) Risk: ===== The security risk of dns squatting vulnerability in the microsoft skypexspaces web-service is estimated as high (CVSS 6.4). Credits: ======== SaifAllah benMassaoud [saifmassaoudi18@gmail.com] - @benmassaou - https://www.vulnerability-lab.com/show.php?user=S.AbenMassaoud Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability- Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. 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