CHALLENGES(2017) CHALLENGES(2017)

Name

square-ctf-challenges - Some challenges were hosted on our infrastructure. They are now available as Docker images which you can download and run on your own computer. If you want to solve the challenges in the same way as the participants of the CTF, you should treat these Docker instances as blackboxes and avoid peeking at the backend code.

Story

In year ERROR_MAX_INT_OVERFLOW of the beloved humans gone "to work", one of our feline operatives awoke from a happy haze of laser-pointer chasing to realize... the humans were gone. Who was invoking the laser?

With a swift leap, she dodged behind the table and traced the beam back to glowing red eyes. An iron-skinned cat sat, its paws tucked under its chin, on her favorite cushion. As she bristled all down her length, the door opened at last--but the human patted the laser cat on its head, inducing a robotic whirr, and said "Aww, you two are playing!"

And so we knew. The hand-held noisemakers humans spoke to could be drowned out by barking. The flat clicky lap-warmers they loved could be sat upon and their attention drawn from the screen. But when the machines came in our own cute forms, we were in grave danger.

Since that first feline alerted us, our operatives have been busy. We’ve stolen encrypted messages from android kittens’ safes. Avian operatives perched on wires logged network traffic as the robots sent their nefarious messages. Our bravest spies slithered into their corporations and nabbed source code.

Now it’s up to you to find coded messages that will let us deactivate the invaders. Use your favorite tools (see Tips and Resources for some suggestions) to decode their messages, break into their apps, and get the flags that will shut down their evil schemes.

Challenges

Name	Category	Docker	Pts	# solved
Book of Allies Find a company at GHC!	Physical		5	102
CTF Briefing Your mission, if you choose to accept it	Grace Hopper		5	96
Security is QRyptous Treasure hunt	Grace Hopper		10	23
Stegasaurus	Reverse		10	74
🍎🍌🍍 🤔😱😭	Image processing		10	226
Bytes You can use a lot of bytes.	Exploit		50	148
Password checker See if your password is secure! Or whether this portal is secure!	Web Security		50	485
The General's Cat Decrypt this ancient scientific article	Crypto		50	648
The Robot's Grandmother Robots have grandparents too!	Forensics		50	572
Ciphercel Crypto inside Google Sheets	Crypto		100	52
Little Doggy Tables -- SELECT * FROM '\u\n\h\a\c\k\a\b\l\e'; --	Web Security		100	198
Reading between the lines Find the secret in the archive	Forensics		100	97
Sniffed Off the Wire Sifting through the noise	Forensics		100	58
SSS Sharing is caring.	Grace Hopper		100	3
Cyber Crossword A unique crossword puzzle.	Crossword		500	34
Needle in the haystack Somewhere in this blob is the flag.	Forensics		500	59
Perlfuscated De-obfuscate some code.	Reverse		500	34
The Turing Agent A Small Gameboy CTF	Reverse		500	41
6yte You only get 6 of them	Exploit		1000	119
Floppy x86 image	Reverse		1000	58
Seventeen A programming language with 17 instructions.	Compiler		1000	48

Results

https://squarectf.com/2017/results.html

Write Ups

https://squarectf.com/2017/write_ups.html

See also

Work_at_Square(1), Privacy_policy(1), Code_of_conduct(1)