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As Web3 platforms focus heavily on blockchain “chaining,” their Web2 counterparts often become vulnerable. For example, a company may secure `web3.example.com` (Web3) but neglect `example.com` (Web2), leading to logic errors. HackenProof reports highlight such flaws, rewarding even “Informative” or “Duplicate” findings due to their critical nature.
You Should Know:
1. Reconnaissance for Web2/Web3 Discrepancies
Use subdomain enumeration to identify mismanaged endpoints:
amass enum -d example.com -passive subfinder -d example.com -silent
2. Testing Logic Flaws in Web2 Forms
Automate input fuzzing with `ffuf` to detect weak validation:
ffuf -u "https://example.com/api/FUZZ" -w /path/to/wordlist.txt -mc 200
3. Blockchain Node Exploitation
If Web3 nodes are exposed, probe for RPC misconfigurations:
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}' http://web3.example.com:8545
4. Session Hijacking via Web2 Cookies
Extract insecure cookies from Web2 domains:
python3 -m http.server 8000 Host malicious JS to steal cookies
5. Smart Contract Logic Bugs
Use `slither` to audit Web3 contracts:
slither --detect reentrancy web3_contract.sol
What Undercode Say:
The shift to Web3 introduces asymmetric security risks. Prioritize:
– Linux Command: Audit nginx/Apache configs for Web2:
grep -r "proxy_pass" /etc/nginx/
– Windows Command: Check for SMB leaks in Web2 servers:
Get-SmbShare | Where-Object { $_.Name -like "dev" }
– Mitigation: Enforce strict CORS policies and chain audits with `mythril` for Web3.
Prediction:
Logic flaws in hybrid Web2/Web3 architectures will surge, with attackers pivoting from Web2 to compromise blockchain layers.
Expected Output:
Subdomains: - web3.example.com (secure) - example.com (vulnerable to CSRF) Exploit Chain: 1. Hijack Web2 session → 2. Forge requests to Web3 gateway.
URLs for further reading:
IT/Security Reporter URL:
Reported By: Sans1986 If – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
