Challenge - Santa's Secure Data Storage
In order to prevent the leakage of any flags, Santa decided to instruct his elves to implement a secure data storage, which encrypts all entered data before storing it to disk.
According to the paradigm Always implement your own crypto the elves designed...
Challenge - Those who make backups are cowards!
Santa tried to get an important file back from his old mobile phone backup. Thankfully he left a post-it note on his phone with the PIN. Sadly Rudolph thought the Apple was real and started eating it (there we go again...). Now only the first of eigh...
Challenge - Padawanlock
A new apprentice Elf heard about "Configuration as Code". When he had to solve the problem to protected a secret he came up with this "very sophisticated padlock".
Unpacking the .zip archive, we got a 19MB Linux executable. That's large. But maybe...
Challenge - Threatened Cat
You can feed this cat with many different things, but only a certain kind of file can endanger the cat.
Do you find that kind of files? And if yes, can you use it to disclose the flag? Ahhh, by the way: The cat likes to hide its stash in /usr/bin/catnip.txt.
Note:...
Challenge - Twelve steps of Christmas
On the twelfth day of Christmas my true love sent to me...
twelve rabbits a-rebeling,
eleven ships a-sailing,
ten (twentyfourpointone) pieces a-puzzling,
and the rest is history.
Challenge - Docker Linter Service
Docker Linter is a useful web application ensuring that your Docker-related files follow best practices. Unfortunately, there’s a security issue in there…
Requirements
This challenge requires a reverse shell. You can use the provided Web Shell or the VPN to so...
Challenge - Santa's lost home
Santa has forgotten his password and can no longer access his data. While trying to read the hard disk from another computer he also destroyed an important file. To avoid further damage he made a backup of his home partition. Can you help him recover the data.
When...
Challenge - Santa's Gift Factory Control
Santa has a customized remote control panel for his gift factory at the north pole. Only clients with the following fingerprint seem to be able to connect:
771,49162-49161-52393-49200-49199-49172-49171-52392,0-13-5-11-43-10,23-24,0Mission: Connect to...
Challenge - Naughty Rudolph
Santa loves to keep his personal secrets on a little toy cube he got from a kid called Bread. Turns out that was not a very good idea. Last night Rudolph got hold of it and frubl’d it about five times before spitting it out. Look at it! All the colors have come off! Nau...
Challenge - Man Commands, Server Lost
Elf4711 has written a cool front end for the linux man pages. Soon after publishing he got pwned. In the meantime he found out the reason and improved his code. So now he is sure it’s unpwnable.
Notes
RESOU...