webmedium

Desires

hackthebox

Task: Forge an admin session in a Go Fiber web app to access the flag page. Solution: Exploit session puzzling (Redis stores session ID before authentication), predictable sha256(timestamp) session IDs, and tar symlink escape via mholt/archiver/v3 to write a forged admin session JSON file through a symlink to /tmp/sessions.

$ ls tags/ techniques/

go file-upload path-traversal fiber session-puzzling symlink-attack tar-symlink predictable-session-id file-based-sessions redis archiver-v3

session_puzzlingtar_symlink_escapepredictable_session_brute_forcesession_forgerysymlink_directory_traversal

Analysis

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

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