greyctf-2022-public

GreyCTF 2022 challenge source and solution

Challenges

To deploy the challenges on your own machine:

1. Clone this repo.
2. cd challenges
3. docker-compose up -d

Enjoy!

Writeups

Thanks to user sayonara#1345 for collating this.

RE

Parcel

• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/parcel
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#9a16

flappy-js

• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/flappy-js
• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-flappy-js-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/flappy-js.md
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#97b7
• https://github.com/jxt00/public-ctf-writeups/blob/main/writeup.md#-flappy-js
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-flappy-js
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/re/flappy-js.md

Memory Game (Part 1)

• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-memory-game-part-1-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/memory_game_part_1.md
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#a85b
• https://github.com/jxt00/public-ctf-writeups/blob/main/writeup.md#-memory-game-part-1
• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/memory-game-part-1
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-memory-game-part-1
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/re/Memory%20Game%20(Part%201).md

flappy-o

• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/flappy-o.md
• https://github.com/caprinux/ctf-writeups/tree/main/NUSGreyHatsCTF2022/RE/flappy-o%20(1%20%26%202)
• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/REV_flappy-o-o2.md
• https://pikachuuu1436.gitbook.io/internal-wiki/ctf-challenges/grey-cat-the-flag/flappy-o
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#flappy-o
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/re/flappy-o.md

flappy-o2

• https://github.com/caprinux/ctf-writeups/tree/main/NUSGreyHatsCTF2022/RE/flappy-o%20(1%20%26%202)
• https://mcdulltii.medium.com/greyctf-2022-write-ups-bda663c58b6f
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/flappy-o2.md
• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/REV_flappy-o-o2.md
• https://pikachuuu1436.gitbook.io/internal-wiki/ctf-challenges/grey-cat-the-flag/flappy-o
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-flappy-o2
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/re/flappy-o2.md

Memory Game (Part 2)

• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/RE/memory_game_p2.md
• https://docs.google.com/document/d/1PFacFmlSh9fhGygfDD-_NJyb7EWR59jYIn0rklXorqQ/edit#bookmark=id.erknayx2dfkw
• https://milotruck.github.io/ctf/Grey-Cat-The-Flag-Qualifiers-2022/#memory-game-part-2
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/memory_game_part_2.md
• https://mcdulltii.medium.com/greyctf-2022-write-ups-bda663c58b6f
• https://github.com/Gyasn/GreyCTF-Qualifiers-Writeup
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-memory-game-part-2

Runtime Environment 1

• https://github.com/ybjv02/ctf-writeups/blob/main/2022/GreyCTF/runtime-environment-1/runtime-environment-1.md
• https://mcdulltii.medium.com/greyctf-2022-write-ups-bda663c58b6f
• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/REV_runtime-environment-1.md
• https://github.com/Gyasn/GreyCTF-Qualifiers-Writeup
• https://milotruck.github.io/ctf/Grey-Cat-The-Flag-Qualifiers-2022/#runtime-environment-1
• https://pikachuuu1436.gitbook.io/internal-wiki/ctf-challenges/grey-cat-the-flag/runtime-environment
• https://github.com/Fawl/writeups/blob/main/2022/greycattheflag/runtime_env_1.md
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-runtime-environment-1
• https://github.com/gyulong1/GreyCTF-Writeups/blob/main/Runtime%20Environment%201.md

Angry Robot

• https://github.com/Gyasn/GreyCTF-Qualifiers-Writeup
• https://github.com/Fawl/writeups/blob/main/2022/greycattheflag/angry_robot.md
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-angry-robot
• https://mcdulltii.medium.com/greyctf-2022-write-ups-bda663c58b6f
• https://ctflib.junron.dev/#/writeups/27/43/52
• https://pikachuuu1436.gitbook.io/internal-wiki/ctf-challenges/grey-cat-the-flag/angry-robot

Runtime Environment 2

• https://mcdulltii.medium.com/greyctf-2022-write-ups-bda663c58b6f
• https://pikachuuu1436.gitbook.io/internal-wiki/ctf-challenges/grey-cat-the-flag/runtime-environment-2
• https://github.com/Hex27/ctfdump/blob/main/writeup.pdf
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-runtime-environment-2

Pwn

easyoob

• https://github.com/samuzora/writeups/tree/main/greyhats-2022#easyoob
• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-easyoob-md
• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/pwn/easyoob.md

easyoob2

• https://github.com/samuzora/writeups/tree/main/greyhats-2022#easyoob2
• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/pwn/easyoob2.md

easyuaf

• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/pwn/easyuaf.md
• https://github.com/seadragon2000341/GreyCatTheFlag22/blob/master/easyuaf.md
• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/PWN_easyuaf.md
• https://github.com/samuzora/writeups/tree/main/greyhats-2022#easyuaf
• https://github.com/Gyasn/GreyCTF-Qualifiers-Writeup
• https://cdn.discordapp.com/attachments/983343997420449822/985541546264891472/easyuaf_writeup.md

ALU

• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/pwn/ALU.md
• https://gist.github.com/lordidiot/bb242bb5c18f40404d6f52ae22405be3
• https://cdn.discordapp.com/attachments/983343997420449822/985541332133113856/alu_writeup.md

coopy

• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/pwn/coopy.md
• https://ctflib.junron.dev/#/writeups/27/44/53
• https://github.com/Hex27/ctfdump/blob/main/writeup.pdf

Crypto

Entry

• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#c617
• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/entry
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/crypto/Entry.md
• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-entry-md
• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/crypto/Entry.md

Equation

• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/equation1.md
• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/CRYPTO_equation.md
• https://blog.javalim.com/2022-GreyCTF/#Equation

Cube

• https://hackmd.io/@xa6xh6byR-e2e5k-Q90BPw/H1HVlplF5
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/cube.md
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/crypto/Cube.md

Baby

• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/crypto/baby.md
• https://hackmd.io/@xa6xh6byR-e2e5k-Q90BPw/B1vg9jWF5
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/baby.md

Block

• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/block.md
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/crypto/block.md

Permutation

• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/CRYPTO_permutation.md
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/permutation.md
• https://ariana1729.github.io/writeups/2022/GreyCTF/Permutation/2022-06-10-Permutation.html
• https://docs.google.com/document/d/1PFacFmlSh9fhGygfDD-_NJyb7EWR59jYIn0rklXorqQ/edit#bookmark=id.5tdhoi5tc0wd
• https://github.com/NyxTo/CTF-Writeups/blob/master/Grey%20Cat%20The%20Flag%202022/Permutation%20%5B452%5D/Writeup.md
• https://github.com/Hex27/ctfdump/blob/main/writeup.pdf

Equation 2

• https://ariana1729.github.io/writeups/2022/GreyCTF/Equation%202/2022-06-10-Equation%202.html
• https://docs.google.com/document/d/1PFacFmlSh9fhGygfDD-_NJyb7EWR59jYIn0rklXorqQ/edit#bookmark=id.9wur0s6pxin
• https://blog.javalim.com/2022-GreyCTF/#Equation-2
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Crypto/equation2.md
• https://github.com/Hex27/ctfdump/blob/main/writeup.pdf
• https://cdn.discordapp.com/attachments/983344060876062821/985542954548613190/equation2_writeup.md

HyperSphere

• https://github.com/DanielT000/CTFwriteups/blob/main/GreyCTF2022/hypersphere.md
• https://github.com/Hex27/ctfdump/blob/main/writeup.pdf
• https://ariana1729.github.io/writeups/2022/GreyCTF/HyperSphere/2022-06-10-HyperSphere.html
• https://cdn.discordapp.com/attachments/983344060876062821/985543118097117314/Hypersphere_writeup.md

Catino

• https://blog.javalim.com/2022-GreyCTF/#Catino
• https://ariana1729.github.io/writeups/2022/GreyCTF/Catino/2022-06-10-Catino.html

Web

Too Fast

• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/too-fast
• https://github.com/samuzora/writeups/tree/main/greyhats-2022#too-fast
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/web/Too%20Fast.md

SelNode

• https://blog.puddle.sg/write-ups/2022-06-11-Grey-Cat-the-Flag#selnode
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Web/SelNode.md
• https://github.com/aliencaocao/GreyCTF-2022/tree/master/sellnode
• https://github.com/samuzora/writeups/tree/main/greyhats-2022#selnode
• https://github.com/comicalromance/GreyCTF-Writeups/blob/main/SelNode.md

Quotes

• https://github.com/samuzora/writeups/tree/main/greyhats-2022#quotes
• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/web/Quotes.md
• https://github.com/comicalromance/GreyCTF-Writeups/blob/main/Quotes.md
• https://docs.google.com/document/d/1PFacFmlSh9fhGygfDD-_NJyb7EWR59jYIn0rklXorqQ/edit#bookmark=id.44wn5ggz4myr
• https://blog.puddle.sg/write-ups/2022-06-11-Grey-Cat-the-Flag#quotes
• https://ctf.zeyu2001.com/2022/grey-cat-the-flag-2022#quotes

Grapache

• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/web/Grapache.md
• https://docs.google.com/document/d/1PFacFmlSh9fhGygfDD-_NJyb7EWR59jYIn0rklXorqQ/edit#bookmark=id.d2gjh0wnrydq

Shero

• https://blog.javalim.com/2022-GreyCTF/#Shero
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Web/Shero.md
• https://github.com/Hex27/ctfdump/blob/main/greyCTF2022/Shero.md
• https://github.com/Gyasn/GreyCTF-Qualifiers-Writeup
• https://ctf.zeyu2001.com/2022/grey-cat-the-flag-2022#shero

Misc

Ghost

• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/ghost
• https://github.com/IRS-Cybersec/ctfdump/blob/master/GreyCTF2022/misc/Ghost.md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/ghost.md
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#94f0
• https://github.com/jxt00/public-ctf-writeups/blob/main/writeup.md#ghost
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#ghost
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Ghost.md

Firmware

• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-firmware-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/firmware.md
• https://nitrozeus.gitbook.io/ctfs/2022/grey-cat-the-flag-2022/firmware
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-firmware
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Firmware.md

Image Upload

• https://github.com/jxt00/public-ctf-writeups/blob/main/writeup.md#-image-upload
• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-image-upload-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/image_upload.md
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#8a88
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#-image-upload
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Image%20Upload.md

Calculator

• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-calculator-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/calculator.md
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Misc/Calculator.md
• https://rainbowpigeon.me/posts/grey-cat-the-flag-qualifiers-2022/#calculator
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Calculator.md

Slow Down

• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/slow_down.md
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Misc/Slow%20Down.md
• https://github.com/gyulong1/GreyCTF-Writeups/blob/main/Slow%20Down.md

Data Degeneration

• https://github.com/cewau/ctf-writeups/blob/main/20220606-greyctf/MISC_data-degneration.md
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Misc/Data%20Degeneration.ipynb
• https://github.com/aliencaocao/GreyCTF-2022/tree/master/datadegen
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Data-Degeneration.md

Logical Computers

• https://blog.javalim.com/2022-GreyCTF/#Logical-Computers
• https://github.com/jontay999/CTF-writeups/blob/master/GreyCTF%202022/Misc/Logical%20Computers
• https://github.com/aliencaocao/GreyCTF-2022/tree/master/Logical%20Computers
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/misc/Logical-Computers.md
• https://github.com/gyulong1/GreyCTF-Writeups/blob/main/Logical%20Computers.md

😮

Welcome

• https://gist.github.com/hhdqirui/4a015d620d4cad45ec3ad29134b9dd71#file-welcome-md
• https://github.com/DJ-Tan/ctf/blob/master/GreyCTF_2022/welcome.md
• https://medium.com/@yoongsofties/my-first-ctf-as-an-unprepared-noob-621f0befe966#3be2
• https://github.com/jxt00/public-ctf-writeups/blob/main/writeup.md#-welcome
• https://github.com/ybjv02/ctf-writeups/blob/main/2022/GreyCTF/welcome/welcome.md
• https://github.com/Shazamed/ctf-writeups/blob/main/greyctf-2022/welcome/Welcome.md