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During a security assessment, a critical vulnerability was discovered that allowed bypassing Single Sign-On (SSO) enforcement by exploiting a hidden registration endpoint (/ent_xt_invite_friend.bix). This misconfiguration enabled unauthorized access to sensitive internal data, including employee details such as full names, addresses, and phone numbers.
You Should Know:
1. Reconnaissance & Discovery
- Google Dorking:
site:app.target.com inurl:login
Discovered endpoint: `/ct_l/login.php`
- JavaScript Deobfuscation:
Used de4js (JavaScript deobfuscator) to analyze obfuscated scripts and uncover hidden endpoints.
2. Exploitation Steps
1. Identify Hidden Registration Endpoint:
/[email protected]
2. Trigger Registration Invitation:
curl -X GET "https://target.com/[email protected]"
3. Complete Registration & Gain Access:
- Use the received registration link.
- Log in as an internal employee.
- Extract sensitive data via internal APIs.
3. Impact & Mitigation
- Impact:
- Full SSO bypass.
- Exposure of PII (Personally Identifiable Information).
- Mitigation:
- Disable legacy registration endpoints.
- Enforce SSO on all authentication flows.
- Implement proper access controls.
4. Linux & Windows Commands for Similar Testing
- Fuzzing for Hidden Endpoints (Linux):
ffuf -w /path/to/wordlist.txt -u https://target.com/FUZZ -mc 200
- JavaScript Analysis (Windows):
Invoke-WebRequest -Uri "https://target.com/js/app.js" -OutFile app.js
- Check for Open Redirects (Linux):
grep -r "window.location.href" /path/to/js/files
What Undercode Say:
This exploit highlights the dangers of overlooked legacy endpoints in modern authentication systems. Organizations must conduct thorough security audits, including:
– Static & Dynamic Code Analysis
– Regular Endpoint Enumeration
– Strict SSO Enforcement
Expected Output:
A successful SSO bypass leading to unauthorized data access, emphasizing the need for robust security controls.
Prediction:
Future attacks may increasingly target misconfigured third-party integrations, making continuous security testing essential.
References:
Reported By: Vamshikrishnaraju Bypassing – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
