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Ho Ho Ho, it's that time of year where many people count down the days to Christmas.

Traditionally, an advent calendar is used which yields one piece of chocolate every day,
but here at OverTheWire, we feel that we can do better than that.
Instead of chocolates, we offer a fresh CTF challenge every day of December until Christmas!

Format: remote, team-based, jeopardy.
Difficulty: intermediate (a couple hours solving time per challenge on average)
Categories: web, re, pwn, crypto, misc
Contact (IRC): #advent @
Contact (Twitter): @OverTheWireCTF

More information as the event comes closer at

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CTF events

OverTheWire Advent Bonanza 20190.00
OverTheWire Advent Bonanza 201823.19
Related tags: web pwn xss x86 crypto rop ld_preload python net xor fun rsa z3 c++ stack_pivot reverse engineering metasploit javascript programming c engineering security arm exploitation node.js misc pwnable re sql nodejs coding networking mongodb http malware bash format-string network social engineering padding html network hacking linux recon googling formatstringexploiter analysis constraint side-channel lfi bitshift pinhole assembly bitflipping breaking reflection msb rev sca kernel radare2 binaryexploitation pwning overflow androidsecurity os x ssti reversing compare angr rc4 coppersmith path-traversal paillier complaining command_injection hash-length-extension reverse ecb partial-recovery heap binary mathematics homeland cybersecurity srp fault syscall binary-exploitation restricted-bash easteregg linear_algebra privesc rowhammer