Discovering Critical Security Vulnerabilities: My Journey into Microsoft’s Release Plans Subdomain
The Beginning
One quiet afternoon, I found myself exploring the intricate web of Microsoft’s online services. Driven by curiosity and a passion for cybersecurity, I decided to delve into a less commonly traversed subdomain: https://releaseplans.microsoft.com. Little did I know, this exploration would lead to the discovery of two significant vulnerabilities that could potentially impact numerous users.
The Exploration
Navigating to Release Plans
My journey began by navigating to the Release Plans site. I logged in with my email address and proceeded to explore the features. Here’s a step-by-step account of my discovery process:
- Login:
- Navigate to
https://releaseplans.microsoft.com. - Login with your email address.
Exploring Features:
- Go to
https://releaseplans.microsoft.com/en-US/?app=Power+Apps. - Click and add some features for release plans.
- Navigate to “My release plans”.
- Click on some plans and select “Add Note”.
Intercepting with BurpSuite:
- Using BurpSuite, intercept the request when adding a note.
- Change the description of the note to include XSS and HTML Injection code.
- Send the request and check the plan again with your note.
To my surprise, the injected code executed flawlessly, confirming the presence of both Stored Cross-Site Scripting (XSS) and HTML Injection vulnerabilities.
The Discovery
Stored Cross-Site Scripting (XSS)
Stored XSS occurs when user-supplied data is stored persistently on a target application’s server without proper validation or sanitization. In this case, I discovered that user input fields on https://releaseplans.microsoft.com are vulnerable to storing malicious scripts, which can then be executed within the browsers of other users accessing the same pages.
Impact:
- Attackers could inject malicious scripts into the application, leading to the theft of sensitive user information, session hijacking, or the manipulation of page content to deceive users into performing unintended actions.
HTML Injection
HTML Injection vulnerabilities occur when an application fails to properly sanitize user-supplied HTML input, allowing attackers to inject arbitrary HTML or JavaScript code into web pages viewed by other users.
Impact:
- Exploiting HTML Injection vulnerabilities can lead to various attacks, including defacement of web pages, injection of phishing content, redirection to malicious websites, and the theft of sensitive information.
Additional Risk Factor
During my exploration, I identified a potential risk where malicious actors could attempt to brute force the “release notes hash ID” to inject XSS and HTML Injection payloads into the community release notes system. This could enable attackers to propagate their malicious content across the community, compromising the trust and security of the platform.
Potential Exploitation Scenarios
- Session Hijacking: Attackers could exploit the vulnerabilities to steal users’ session cookies, gaining unauthorized access to their accounts.
- Phishing Attacks: Malicious actors could replace legitimate content with phishing pages, tricking users into divulging sensitive information or downloading malicious files.
- Content Manipulation: Attackers could modify entire web pages to distribute malware or propagate their malicious agenda, posing significant risks to user trust and security.
Firing Up the #xssor Tool
With these findings, I decided to fire up my trusted #xss0r Tool to further validate the vulnerabilities. I saved the request from my notes because my tool support testing POST requests with option — post and replaced the relevant text field with my XSS payloads. When I executed the request, my screen was flooded with hundreds of XSS popups, serving as undeniable proof of the vulnerabilities’ existence and proof that my tool doesnt’t give any false positive results.
Conclusion
My journey to uncover these vulnerabilities highlights the critical importance of continuous security assessments. Using my #xss0r Tool, I was able to efficiently identify and validate Stored XSS and HTML Injection vulnerabilities across multiple Microsoft subdomains. This tool has proven to be an invaluable asset in my security toolkit, making the process of vulnerability detection both quick and effective.
By addressing these issues promptly, Microsoft can enhance the security of its applications, protect its users, and maintain trust in its brand. For further clarity, I have attached images and videos illustrating the exploitation of these vulnerabilities. If you have any questions or require additional information, feel free to contact me on my Linkedin profile:
Proof of Concept:
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