Microsoft Expands Bug Bounty Program: Hunt XSS, CSRF & Auth Bypasses for Up to 0K!

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Introduction:

Microsoft has expanded its Identity Bug Bounty program, adding six new domains to its scope, offering ethical hackers lucrative rewards for discovering vulnerabilities like XSS, CSRF, and authentication flaws. With payouts reaching $20,000, this is a prime opportunity for penetration testers and bug bounty hunters.

Learning Objectives:

  • Understand Microsoft’s new bug bounty scope and reward structure.
  • Learn key techniques for identifying XSS, CSRF, and authentication bypasses.
  • Discover tools and commands to streamline vulnerability hunting.

1. Identifying XSS Vulnerabilities in Microsoft’s New Domains

Command (Burp Suite):

grep -r "mysignins.microsoft.com" /path/to/traffic --include=".har"

Step-by-Step Guide:

  1. Intercept Traffic: Use Burp Suite or OWASP ZAP to capture HTTP requests to mysignins.microsoft.com.
  2. Search for Reflected Inputs: Look for unsanitized user inputs in parameters like ?redirect=, ?token=, or form fields.
  3. Test Payloads: Inject basic XSS probes (<script>alert(1)</script>) and monitor responses.
  4. Escalate: If reflected, craft a persistent payload for higher bounties.

2. Hunting CSRF Flaws in `myaccount.microsoft.com`

Command (cURL for CSRF PoC):

curl -X POST -d "user=admin&action=changepassword" https://myaccount.microsoft.com --header "Origin: https://attacker.com"

Step-by-Step Guide:

  1. Check for Missing CSRF Tokens: Submit requests without tokens or with predictable values.
  2. Test Origin/Referer Bypass: Manipulate headers to spoof legitimate requests.
  3. Validate Impact: Confirm if actions (e.g., password changes) execute without user consent.

3. Exploiting Auth Bypasses in `microsoftazuread-sso.com`

Command (JWT Tampering with `jq`):

echo $JWT | jq -R 'split(".") | .[bash],.[bash] | @base64d'

Step-by-Step Guide:

  1. Decode JWTs: Inspect tokens for weak algorithms (none or `HS256` with guessable secrets).
  2. Modify Claims: Change `”role”:”user”` to `”role”:”admin”` and re-sign.
  3. Replay Requests: Submit tampered tokens to escalate privileges.

4. Automated Scanning with `xss0r` (Linked Tool)

Command (xss0r CLI):

python3 xss0r.py -u "https://myapps.microsoft.com/search?q=<script>"

Step-by-Step Guide:

  1. Install xss0r: Download from `http://store.xss0r.com`.

2. Configure Target: Input Microsoft’s new domains.

  1. Run Payloads: Let the tool fuzz parameters for XSS.

5. Cloud Hardening: Mitigating Reported Vulnerabilities

Command (Azure CLI for Logging):

az monitor diagnostic-settings create --resource /subscriptions/{sub-id} --name "XSS Monitoring" --logs '[{"category":"AppServices","enabled":true}]'

Step-by-Step Guide:

  1. Enable Logging: Track suspicious inputs in Azure services.

2. Implement WAF Rules: Block common XSS payloads.

  1. Patch & Report: Use findings to secure systems.

What Undercode Say:

  • Key Takeaway 1: Microsoft’s expanded scope signals higher investment in securing identity platforms.
  • Key Takeaway 2: Ethical hackers can leverage automation (Burp, xss0r) for efficient bug hunting.

Analysis:

This update reflects Microsoft’s proactive stance against identity-based attacks. With SSO and cloud adoption rising, expect more such programs—hunters should prioritize logic flaws over low-hanging fruit.

Prediction:

By 2026, 60% of high-impact bugs will stem from misconfigured identity providers. Microsoft’s bounty expansion sets a precedent for other tech giants to follow.

Happy Hunting! 🔍💻

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Reported By: Ibrahim Husi%C4%87 – Hackers Feeds
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