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Joel I. Patrick, an Offensive Security Analyst, recently disclosed critical vulnerabilities affecting Porsche and KTM (PIERER Mobility Group). The findings included:
1. Subdomain Takeover
2. Broken Access Control
These vulnerabilities were responsibly reported through the companies’ vulnerability disclosure programs, and acknowledgments were received.
You Should Know: Exploiting Subdomain Takeover and Broken Access Control
1. Subdomain Takeover
A subdomain takeover occurs when an attacker claims a subdomain that is no longer in use but still points to a vulnerable third-party service (e.g., abandoned cloud instances, expired DNS records).
How to Test for Subdomain Takeover:
1. Identify Unused Subdomains
subfinder -d example.com -o subdomains.txt assetfinder --subs-only example.com | httprobe
2. Check for CNAME Records
dig CNAME subdomain.example.com nslookup -type=CNAME subdomain.example.com
3. Verify Hosting Providers
If the subdomain points to a deleted cloud service (AWS S3, GitHub Pages, Heroku), an attacker can claim it.
4. Exploit Using Tools
nuclei -t takeovers/ -l subdomains.txt subzy run --targets=subdomains.txt
2. Broken Access Control
Broken Access Control allows attackers to bypass authorization and access restricted data or functions.
Common Exploitation Methods:
1. IDOR (Insecure Direct Object Reference)
Manipulate URLs or API requests:
curl -X GET https://example.com/api/user/123 → Try 124, 125, etc.
2. JWT Tampering
Decode and modify JWT tokens:
echo "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..." | base64 -d
3. Missing Role-Based Checks
Test with different user roles:
curl -H "Authorization: Bearer USER_TOKEN" https://example.com/admin
What Undercode Say
Responsible vulnerability disclosure is crucial in cybersecurity. Tools like subfinder, nuclei, and manual testing help uncover flaws before attackers exploit them. Broken Access Control remains a top OWASP risk—always validate permissions server-side.
Expected Output:
- A secured subdomain configuration.
- Proper access control mechanisms in APIs and web apps.
- Continuous automated scanning for vulnerabilities.
For further reading:
References:
Reported By: Joel I – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
