Lab 209 — BuildForge — Path Traversal in Static File Serving

hackadvisor

Task: CI/CD dashboard with custom static file serving at /static/{filepath}. Solution: path traversal via ../data/.env bypasses prefix check due to string concatenation without normalization.

lfi path_traversal static_files nodejs nginx express prefix_check_bypass

curl_path_as_ispath_traversal_prefix_bypassstring_concatenation_bypass

$ ls tags/ techniques/

lfi path_traversal static_files nodejs nginx express prefix_check_bypass

curl_path_as_ispath_traversal_prefix_bypassstring_concatenation_bypass

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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