ESPILON-CTF-2026-Writeups/IoT/Nurse_Call/README.md

Nurse Call -- Solution

Overview

Connect to the maintenance terminal and investigate phantom calls from Room 013.

Steps

1. Connect: nc <host> 1337
2. Read logs/appels.log -- notice Room 013 phantom calls, especially the last line: payload room 013: 0x4c41494e
3. Read logs/reseau.log -- confirms 0x4c41494e -> ASCII: "LAIN"
4. Read logs/maintenance.log -- technician says to use reveil.sh --id with the payload ID
5. Optionally read config/navi-care.conf for exact syntax: reveil.sh --id <MODULE_ID>
6. Execute: ./tools/reveil.sh --id LAIN
7. Flag is printed: ESPILON{r3v31ll3_m01_d4ns_l3_w1r3d}

Key insight

The hex payload 0x4c41494e is ASCII for "LAIN". The player must decode this and use it as the module identifier with the wake tool.

Flag

ESPILON{r3v31ll3_m01_d4ns_l3_w1r3d}

Author

Eun0us