Xmasctf2019 on Damjan Cvetko

Xmas CTF 2019 - Day 23

Fri, 27 Dec 2019 00:00:00 +0000

Challenge: Since Christmas is getting close, there has been a lot of fake news and Santa is getting some strange messages.

Elves are struggling to handle all security incidents, but they are busy also with some other things. Their intelligence intercepted some strange message:
a61e563297243b00602d82576e9732cc92446a62c772bf1c986ec7b53daa980e

They have seen also some words like Santa on the wire, but they are clueless about what do they mean.

Can you help them to solve this mystery, since the clock is ticking?

Xmas CTF 2019 - Day 21

Tue, 24 Dec 2019 00:00:00 +0000

Challenge: Santa trusted 3 elves with his secrets. They couldn’t agree on the encryption scheme to use, so each of them chose a different one. Can you decrypt each of the messages in the attached archive and recover the secret.

Xmas CTF 2019 - Day 24

Tue, 24 Dec 2019 00:00:00 +0000

Challenge: Santa thanks you all for all the help, dedication and all the challenges you have completed! Thanks again and don’t forget to check BSidesLjbuljana #CFP and sponsorship offers. Now Santa is already running late to some parts of the world but anyway it’s all about perfect timing! Enjoy the last challenge and see you at #BSidesLjubljana!

https://rudolph.bsidesljubljana.si

Xmas CTF 2019 - Day 22

Sun, 22 Dec 2019 00:00:00 +0000

Challenge: Someone send an image to Santa but it got corrupted during the transfer or did it? Maybe someone intentionally did this and hidden a message inside?

Xmas CTF 2019 - Day 17

Sat, 21 Dec 2019 00:00:00 +0000

Challenge: Every year Santa is using his own Weather App to check if he can deliver presents all around the globe. It’s a very secret and reliable app! Or is it? is it /xams or is it /flag

Xmas CTF 2019 - Day 19

Fri, 20 Dec 2019 00:00:00 +0000

Challenge: In the last days of preparation to test his flying capabilities, Santa’s elves flew 47 times around the earth and then another 13 times. Then Santa’s elves inserted all good children addresses and suddenly the navigation system crashed with this error message: r~yy!cbb(twz’d"++x(y!aqqt&%u{b)tw%)sv$+$tyssvrr$|zalll Is it some kind of buffer overflow? Do you have any idea how to solve this issue ?

Xmas CTF 2019 - Day 20

Fri, 20 Dec 2019 00:00:00 +0000

Challenge: The elf developers looked at their mistakes and have decided to make a new login page for Santa. They’ve used some fancy new technologies, maybe that will save them. https://dancer.bsidesljubljana.si/

Xmas CTF 2019 - Day 18

Wed, 18 Dec 2019 00:00:00 +0000

Challenge: Someone sent you a message, that can only be read by finding out the password. There was also a hint alongside the message: What is Christmas about? Note: flag format is as always xmas{flag}

Xmas CTF 2019 - Day 16

Mon, 16 Dec 2019 00:00:00 +0000

Challenge: Santa updated his Christmas carol playlist, but he noticed that the elves are trying to trick him again. He is listening to this song over and over again, but cannot decode it. Please help Santa to solve this audio mystery.

Xmas CTF 2019 - Day 14

Sun, 15 Dec 2019 00:00:00 +0000

Challenge: Santa has got an essential song locked away in the attached file, but now he forgot the key. He was interested in the basic building blocks of modern cryptography; also he was reading a lot about politics. Can you help him figure out the key so everyone could listen to this song on repeat?

Xmas CTF 2019 - Day 15

Sun, 15 Dec 2019 00:00:00 +0000

Challenge: Sometimes we need to hide something, to not be too obvious and to keep it away from evil eyes!

Xmas CTF 2019 - Day 12

Sat, 14 Dec 2019 00:00:00 +0000

Challenge: While Santa was changing his password he was flying very fast through the sky. Normally, the password is successfully changed when he touches 100 stars (iterations). But this time something went wrong and after touching the 10th star (iteration) one reindeer kicked his computer. Now he missed the remaining 90 stars. Can you help us find what password Santa was typing?
24e80f0f1fe3f9ae8865301b2d56fc4378d4e1397226cd4311a9b600b4223600

Xmas CTF 2019 - Day 13

Fri, 13 Dec 2019 00:00:00 +0000

Challenge: Different Web Application, same Elf developers. They must have screwed something up again. Take a look at https://dasher.bsidesljubljana.si/ and try to find the flag.

Xmas CTF 2019 - Day 11

Wed, 11 Dec 2019 00:00:00 +0000

Challenge: Some new reindeers joined Santa’s sledding crew. To easily remember their names, Santa wrote them down in his app. Can you find out who are the new crew members? note: Flag format is still xmas{flag}

Xmas CTF 2019 - Day 10

Tue, 10 Dec 2019 00:00:00 +0000

Challenge:
Santa forgot his password from last year for the gift system, all he has is the password hash from the backup database - 0e05910310684507431798973709823129745294. The password is too strong to crack even for his magic mining rigs. His elves are not very good web developers though so it shouldn’t be hard to find a way to log into the app. https://blitzen.bsidesljubljana.si/

Xmas CTF 2019 - Day 9

Mon, 09 Dec 2019 00:00:00 +0000

Challenge: Santa has run out of money for the presents. He’s checking some old TXT messages from his supporters to check where he miscalculated the budget as he had to calculate it from 3 different sources.

Xmas CTF 2019 - Day 8

Sun, 08 Dec 2019 00:00:00 +0000

Challenge: Online Steganography is helping Santa to get his work done!

Xmas CTF 2019 - Day 7

Sat, 07 Dec 2019 00:00:00 +0000

Challenge: Santa has encoded a secret text in some weird format. Robots couldn’t decode it, let’s hope that humans and other beings can.

Xmas CTF 2019 - Day 6

Fri, 06 Dec 2019 00:00:00 +0000

Challenge: Santa locked some children letters and forgot the password. Please help Santa to unlock the wishes so the kids around the world will be happy!

Xmas CTF 2019 - Day 5

Thu, 05 Dec 2019 00:00:00 +0000

Challenge: To get around the globe in one night, you need to go fast. That is why Santa installed a turbo mode for his sleigh. To activate it, all you need is passcode. Not using the sled for a long time, he - unfortunately - forgot it. Help him unlock his sled’s turbo mode.

Xmas CTF 2019 - Day 2

Wed, 04 Dec 2019 00:00:00 +0000

Challenge: “Santa is grateful for his little helpers who contribute to the Xmas spirit, so do not forget to check them out!”

Xmas CTF 2019 - Day 4

Wed, 04 Dec 2019 00:00:00 +0000

Challenge: The naughty and nice list must always be kept safe. That’s why Santa password protected the document and stored the encrypted password in this app. Can you get the password out for him?

Xmas CTF 2019 - Day 3

Tue, 03 Dec 2019 00:00:00 +0000

Challenge: Santa has a secret switch that blows his sleigh if anyone steals them. It’s nor near the halfway across the globe, but the timer is coming to an end. Will you be able to save Xmas?

Xmas CTF 2019 - Day 1

Sun, 01 Dec 2019 21:00:00 +0000

Challenge: “Is there something hidden behind the scenes?”

BSidesLjubljana Xmas CTF Challenge 2019 Writeup

Sun, 01 Dec 2019 00:00:00 +0000

The great people of BSidesLjubljana, SSRD and Viris prepared again an excellent CTF challenge.