CTF Challenges
38 challenges
Black Box
A mysterious scoring interface accepts candidate strings and returns a confidence value. Something about the way it...
Second Life
SecureNotes is an enterprise note-keeping application. User sessions are managed through cookies. Something about how...
Photo Finish
HackShop is an exclusive merch store with one item you really want: the flag. It costs $100, but your coupon is only...
Fence Post
A secure vault application for authorized personnel. The developer wrote a custom input function — surely that's more...
Health Check
A network diagnostic tool lets you check if hosts are reachable. The developer added some input filtering, but is it...
Greeting Card
A greeting card generator lets you create personalized messages. But what if the application takes your input a little...
Trust Issues
A secure authentication portal protects its admin panel with token-based access control. Log in as a guest and find a...
Talk Back
A debug echo service echoes back whatever you send. But it's echoing more than it should... Your mission: Make the...
Buffer Runner
A data processing utility from 2005 was recently discovered still running in production. The developers claim it's...