Pwnhack. Com Dragon [verified] Link

| Pitfall | Symptom | Fix | |---------|----------|-----| | | Server closes connection immediately | Insert the 4‑byte 0xDEADBEEF before payload. | | Length field treated as signed | Negative lengths cause allocation of a tiny buffer → immediate crash | Use Python’s ctypes.c_int64 to craft a large positive length that wraps to a negative signed value. | | VM stack overflow doesn’t reach return address | Crash inside the VM but no control flow gain | Count the VM’s internal stack size ( 0x80 bytes in most builds) and overflow by at least 8‑bytes + padding. | | Canary XOR mismatch | Program aborts after VM returns | Replicate the XOR operation ( canary ^ key ) in your payload; the key is often stored in a global variable you can leak. | | Incorrect libc base | ROP chain lands on unmapped memory | Verify the leak with readelf -s dragon_libc.so to locate the symbol you actually leaked (e.g., puts ). |

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| File | What it is | Quick sanity check | |------|------------|--------------------| | dragon | The vulnerable binary (stripped) | file dragon → ELF 64‑bit LSB executable | | dragon_libc.so | A custom libc version (often with symbols hidden) | ldd dragon | | README.txt | Narrative + a hint about the protocol | “Send a ‘hello’ and wait for a response” | | protocol.txt (optional) | Description of the wire format | May contain a tiny base‑64 table | | docker-compose.yml | A ready‑made container for safe testing | docker compose up -d | | Pitfall | Symptom | Fix | |---------|----------|-----|

The Pwnhack.com domain itself acted as a portal. Screenshots from the era (preserved on the Wayback Machine) show a minimalist dark page with only a dragon logo and a login prompt. No products listed, no prices—only members knew. | | Canary XOR mismatch | Program aborts