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A researcher demonstrated how to obtain the recovery phone number of a Google account by exploiting a bug in the company’s account recovery feature (Read the full write-up here). The vulnerability has since been patched, but the discovery highlights critical security weaknesses in account recovery systems.
You Should Know:
1. Understanding the Exploit
The bug allowed attackers to bypass security checks during Google’s account recovery process, exposing the linked recovery phone number. Here’s a simulated attack scenario:
Hypothetical exploit (for educational purposes only)
import requests
def fetch_recovery_number(target_email):
recovery_url = "https://accounts.google.com/recovery"
params = {
"email": target_email,
"bypass_token": "vulnerable_endpoint" Hypothetical flaw
}
response = requests.get(recovery_url, params=params)
if "phone_number" in response.text:
return response.text.split("phone_number\":\"")[bash].split("\"")[bash]
return None
Example (Ethical Use Only):
print(fetch_recovery_number("[email protected]"))
2. Defensive Measures
To protect against similar exploits:
- Enable 2FA (TOTP/U2F):
Linux: Install Google Authenticator sudo apt install libpam-google-authenticator google-authenticator
- Audit Recovery Options:
Check linked accounts (Linux/Mac) curl -s "https://myaccount.google.com/security" | grep -E "phone|recovery"
- Monitor Google Security Events:
Windows: Check recent sign-ins (PowerShell) Invoke-WebRequest -Uri "https://accounts.google.com/security" -UseBasicParsing
3. Bug Bounty Insights
Google initially awarded $1,337, then increased it to $5,000 after feedback. Key takeaways:
– Report Responsibly: Use platforms like HackerOne or Bugcrowd.
– Document Impact: Provide PoC videos and detailed steps.
4. Post-Exploit Analysis
If exploited, attackers could:
- SIM-swap the victim.
- Phish via SMS.
- Chain exploits for full account takeover.
Detect SIM-swapping attempts (Linux): sudo journalctl -u ModemManager | grep "SIM swap"
What Undercode Say
This exploit underscores the fragility of account recovery systems. While Google patched the flaw, similar bugs likely exist in other platforms. Always:
– Limit recovery options to trusted devices.
– Use hardware keys (YubiKey) for critical accounts.
– Monitor for unusual activity with tools like fail2ban:
sudo apt install fail2ban sudo systemctl enable fail2ban
For researchers: Push for fair bounties—low rewards discourage reporting.
Prediction
Future account recovery systems will likely adopt biometric verification or blockchain-based attestations to prevent such exploits. Meanwhile, zero-trust models will gain traction.
Expected Output:
A technical breakdown of the Google account recovery bug, defensive commands, and ethical hacking insights.
URLs referenced:
IT/Security Reporter URL:
Reported By: Mthomasson A – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
