Listen to this Post
A recent vulnerability discovered in Facebook’s platform allowed attackers to bypass Multi-Factor Authentication (MFA) and gain access to Meta’s business section. The researcher reported the issue, but Meta claimed they were already aware of it, making the bug ineligible for a reward that could have exceeded $20,000. This raises concerns about the reliability of bug bounty programs, as companies may dismiss valid reports under the pretext of prior knowledge.
You Should Know: Techniques to Bypass MFA & Secure Systems
Bypassing MFA is a critical attack vector in cybersecurity. Below are some methods attackers use, along with defensive measures:
1. Session Hijacking & Cookie Theft
Attackers steal session cookies to bypass MFA. Tools like Burp Suite and OAuth 2.0 exploit scripts can intercept authentication tokens.
Defense:
Check active sessions (Linux) $ who -a $ netstat -tulnp | grep 'facebook' Clear browser sessions $ rm -rf ~/.cache/google-chrome/Default/Cookies
2. Exploiting OAuth Misconfigurations
Many MFA systems rely on OAuth. Misconfigurations can allow attackers to generate valid tokens without MFA.
Test Command:
Use curl to test OAuth endpoints $ curl -X POST "https://api.facebook.com/oauth/token" -d "grant_type=client_credentials&client_id=XXX&client_secret=XXX"
3. SIM Swapping & SMS Interception
If MFA relies on SMS, attackers can perform SIM swaps.
Prevention:
Check SIM status (Linux) $ mmcli -m 0 Enable hardware-based MFA (YubiKey) $ sudo apt install yubikey-manager $ ykman oath accounts list
4. API Exploits
Facebook’s business API may have undocumented endpoints vulnerable to bypass.
Fuzzing with FFUF:
$ ffuf -w /path/to/wordlist -u "https://business.facebook.com/FUZZ" -mc 200
5. Phishing + Reverse Proxy Attacks
Tools like Evilginx2 can capture MFA tokens in real time.
Defensive Command (Block Phishing Domains):
Add phishing domains to hosts file $ echo "0.0.0.0 evilphish.com" | sudo tee -a /etc/hosts
What Undercode Say
Bug bounty programs, while lucrative, often lack transparency. Companies like Meta may dismiss valid reports to avoid payouts. Ethical hackers should:
– Document all findings with timestamps.
– Use legal protections (e.g., HackerOne’s disclosure policies).
– Focus on lesser-known endpoints where duplicates are rare.
Expected Output:
- MFA bypass via session hijacking - OAuth token manipulation - API fuzzing for hidden endpoints - Legal safeguards for bug hunters
Prediction
As MFA bypass techniques evolve, companies will face increasing pressure to improve bug bounty transparency—or risk losing skilled researchers to underground markets.
Relevant URL: Facebook Bug Bounty Program
References:
Reported By: Yago Martins – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
