t0x1cl / hkcert-ctf-2021-challenges

HKCERT CTF 2021

Index

ID	Title	Author	Categories	Stars	Points	Solves
00	差一些什麼? / babyUXSS	ozetta	Web	★☆☆☆☆	100	7/234
01	神奇的糊塗魔藥 / Potion of Ciphermath	mystiz	Misc, Crypto	★★★★☆	450	1/234
02	Freedom / Cipher Mode Picker	mystiz	Crypto	★☆☆☆☆	100	21/234
04	所有遺失的東西 / All Missing	cire_meat_pop	Pwn	★☆☆☆☆	150	27/234
05	留下來的人 / The Remaining One	cire_meat_pop	Misc, Pwn	★★★☆☆	300	4/234
06	今天我不想做嘢 / Let's Chill	mystiz	Reverse	★★★★☆	450	4/234
07	集合吧！地球保衛隊 / Sratslla SEA	mystiz	Crypto	★★★★☆	450	2/234
10	Ophiuchus	ozetta	Web	★★★★★	500	2/234
11	無聲浪 / The Wave of Us	byronwai	Forensics	☆☆☆☆☆	50	152/234
12	深夜浪漫 1 / babyURIi	ozetta	Web, Pwn	★★☆☆☆	200	4/234
12b	深夜浪漫 2 / Return of babyURIi	ozetta	Web	★★★☆☆	350	3/234
15	幫緊你！幫緊你！ / Flag Checker™	mystiz	Pwn	★★☆☆☆	250	3/234
17	最難行的路 / The Hardest Path	mystiz	Reverse, Misc	★★★☆☆	300	9/234
20	開燈．熄燈 (熄燈版) / Jail of Blind	cire_meat_pop	Pwn	★★★☆☆	300	4/234
22	小諧星 / A Joke Cipher	mystiz	Crypto	☆☆☆☆☆	50	88/234
23	郵差叔叔送信純熟迅速送出 1 / Jack Botnet Service 1	eriri	Forensics	★★★☆☆	300	12/234
24	郵差叔叔送信純熟迅速送出 2 / Jack Botnet Service 2	eriri	Forensics	★☆☆☆☆	150	8/234
28	想改寫的事 / To Modify the Past	cire_meat_pop	Pwn	☆☆☆☆☆	50	54/234
29	告別式 / Cool Down	cire_meat_pop	Pwn	★★☆☆☆	200	10/234
30	世上唯一雙細胞 1 / Fortune Cookie 1	cire_meat_pop	Pwn	★★☆☆☆	250	4/234
31	世上唯一雙細胞 2 / Fortune Cookie 2	cire_meat_pop	Pwn	★★★☆☆	350	3/234
32	薛丁格的盒子 / Unobserved Box	cire_meat_pop	Pwn, Reverse	★★☆☆☆	250	6/234
35	千世書 / Mastermind	cire_meat_pop	Pwn	★★★★★	500	0/234
36	逐步拾回自己 / Step by Step	cire_meat_pop	Reverse, Misc	★☆☆☆☆	100	68/234
37	暈暈陀陀 1 / CTF Tuning Master (Read)	ozetta	Web, Misc	★☆☆☆☆	150	15/234
37b	暈暈陀陀 2 / CTF Tuning Master (Execute)	ozetta	Web	★★★☆☆	300	3/234
38	點點心 / Steamed Meatball	ozetta	Misc	★☆☆☆☆	150	7/234
39	選擇困難 / Difficult Choice	byronwai	Forensics	★★★★☆	400	5/234
40	純孩兒 / babyXSS	ozetta	Web	★☆☆☆☆	100	37/234
41	消失的人 / The Disappeared	byronwai	Forensics	★★☆☆☆	200	51/234
43	理性與任性之間 / Shuffle	harrier	Reverse	☆☆☆☆☆	50	60/234
44	哥本哈根的另一個我 / Another VM in København	harrier	Reverse	★★★☆☆	300	2/234
45	一知半解 / Half-truth VM	harrier	Reverse	★★☆☆☆	250	2/234
46	要做更壞的事 / Make it worse VM	harrier	Reverse	★★★★★	500	0/234
49	漫漫碎 / Scattered	harrier	Reverse	★☆☆☆☆	100	16/234
51	Old Fashioned / ↑←↓↑x	harrier	Reverse	★★☆☆☆	250	11/234
53	無門 / Doorless 1	byronwai	Forensics	★☆☆☆☆	100	6/234
54	幻象 / No Door 2	byronwai	Forensics	★★☆☆☆	200	14/234
55	塵 / Positron	ozetta	Web, Pwn, Browser, Misc, Reverse, Crypto	★★★★☆	400	3/234
56	因講了出來 / Because I Said It	byronwai	Web	★☆☆☆☆	150	76/234
57	長話短說 / Key Backup Service 1	mystiz	Crypto	★☆☆☆☆	150	6/234
58	Braceless / Key Backup Service 2	mystiz	Crypto	★★★☆☆	350	5/234
59	返鄕下耕田啦你 / easyheap	ken	Pwn	★★☆☆☆	250	5/234
61	倒數 / babyre	ken	Reverse	★★★★☆	450	3/234
62	角落生物 1 / Squirrel Community 1	apple	Web	☆☆☆☆☆	50	176/234
62b	角落生物 2 / Squirrel Community 2	apple	Web	★★☆☆☆	250	2/234
63	回到12歲 / scratch-tic-tac-toe	apple	Misc	★★☆☆☆	200	86/234
64	荊棘海 / The Wilderness	mystiz	Web	★☆☆☆☆	100	39/234
67	約定的夢幻島 / Sign In Please, Again	mystiz	Crypto	★★★★★	500	2/234
70	樂園 / JQ Playground	apple	Web	★★☆☆☆	200	15/234
72	中二病人 / A Junior Mathematician	mystiz	Reverse	★★★☆☆	350	3/234
74	時間的囚犯 / Timebomb	darkfloyd	Reverse	★☆☆☆☆	100	16/234
79	FreeRider / Tenet: The Plagarism	mystiz	Crypto	★★★☆☆	350	4/234
98	網絡安全隱患 / Infant Browser	ozetta	Web, Pwn, Browser, 手把手教你玩	☆☆☆☆☆	50	52/234
s1	玩咗先至瞓 / Sanity Check	?		☆☆☆☆☆	50	234/234
s2	係咁先啦 / Feedback	?		☆☆☆☆☆	50	169/234

Training challenges

ID	Title	Author	Categories
T1	Infant XSS	Ozetta	Web, 手把手教你玩
T2	Simple Sign On	Mystiz	Crypto
T3	Jail of Seccomp	cire_meat_pop	Pwn
T4	Python calculator	cire_meat_pop	Pwn
T5	Mr. Robot - Rootkit	Darkfloyd	Reverse

Acknowledgements

This repo contains all challenges from HKCERT CTF 2021, including those are not by Black Bauhinia.

Thank you to HKCERT and all challengers for publicizing challenges in this repository!

Folder structure

└── id-challengename/
  ├── env/                    a dockerized environment that is accessible via `nc` or browsers
  │   ├── docker-compose.yml
  │   ├── image1/
  │   │   ├── Dockerfile
  │   │   └── ...
  │   └── image2/
  │       ├── Dockerfile
  │       └── ...
  ├── src/                    whatever files that is used as auxiliary to the challenge, in whatever
  │                           use. this includes but not limited to the source code for the binary,
  │                           the solution script (or writeup) that is considered to solve the
  │                           challenge.
  ├── writeups/
  │   ├── team1/
  │   │   └── README.md       the writeup and any auxiliary script that you used to solve a
  │   └── team2/              challenge - one folder per team (feel free to include the link to your
  │       ├── README.md       writeup, too).
  │       └── solve.py
  └── README.md               the README file that contains a brief summary (title, description,
                              category, author and flag) of the challenge