Discovering a Reflected XSS Filter Bypass: My Journey into Microsoft’s Support UAT Subdomain
The Beginning
One quiet afternoon, my curiosity led me to explore Microsoft’s Support UAT subdomain: https://support-uat.microsoft.com. Driven by a passion for cybersecurity and a keen eye for potential vulnerabilities, I embarked on a journey that would soon reveal a significant security flaw.
The Exploration
Navigating to the Vulnerable Page
I began my adventure by navigating to the search functionality on the Support UAT site. Here’s a step-by-step account of my discovery process:
- Navigate to the Vulnerable Page:
Inputting the Payload:
- In the search field, I input the following payload: ibrahim”> the page response was
'ibrahim">', indicating that it is hex encoded with HTML encoding.
The Challenge
Before running my tool, I manually tried over 100 payloads, but none worked. Frustrated but determined, I decided to run my #IBRAHIMXSS Tool in the search field as a last resort. I didn’t have much hope for success and had already started looking at another target while my scan was in progress with 2,500 payloads.
The Breakthrough
A few seconds later, I received a popup notification with the results of my scanning. My tool had successfully found 1 out of 2,500 XSS payloads on support-uat.microsoft.com. The HTML report showed the exact payload that worked. When I clicked on the link, I saw the alert "1" popup.
Imagine that: out of 2,500 payloads, only one worked! Testing all 2,500 payloads manually would have taken an enormous amount of time. Figuring out which payload was correct for this specific vulnerability would have been a daunting task. But my #IBRAHIMXSS Tool detected and exploited it in just a few seconds. Amazing!
Impact
This vulnerability can be exploited to execute scripts in the user’s browser session, potentially leading to session hijacking, data theft, or malicious redirections.
Proof of Concept:
- Navigate to the Vulnerable Page:
2. Input the Payload:
- Input
<svg onload=alert("1")>into the search field.
3. Observe the Result:
- The browser interprets this payload as valid HTML and executes the JavaScript code, triggering an alert box displaying “1”.
FINAL URL:
https://support-uat.microsoft.com/search/results?query=%3Csvg+onload%3Dalert%26%230000000040%221%22)%3E&isEnrichedQuery=falseVulnerability Details:
- Issue: Reflected XSS Filter Bypass
- Location: support-uat.microsoft.com
- Description: The current input sanitization mechanism on the domain inadequately escapes certain characters, allowing for the bypass of XSS protections. The filter converts special characters into their HTML entities, but this can be circumvented.
- Example: When adding
ibrahim">into the system, the page response was'ibrahim">', indicating that it is hex encoded with HTML encoding.
Conclusion
The presence of this filter bypass underlines the need for a comprehensive review of the current XSS protection mechanisms implemented on support-uat.microsoft.com. By leveraging my skills and the power of the #IBRAHIMXSS Tool, I uncovered a critical vulnerability that could have far-reaching consequences for Microsoft and its users.
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:
#IBRAHIMXSS Tool Presentation
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💥 Over 2500 Encoded Payloads
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⏳ Customizable Delay
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🔌 XSS into all kinds of extensions
🔒 Secure and Reliable
🌟 Continuous Updates
📈 High Performance
🔄 Automated Scanning
🔍 Accurate Detection Algorithms
🔧 Easy Configuration
📂 Support for Various Web Technologies
🚀 Rapid Deployment
🔎 Advanced Search and Filter Options
🔧 Customizable Payloads
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