# Challenges
Capture the flags. Prove your skills.
107 challenges found
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Sky Runner
A web-based arcade game with a high score board. The score submission uses cryptographic signatures β but how strong ...
People Finder 4
The database is better protected now. Can you still extract what you need?
People Finder 3
Another database, another search. This time errors are hidden β blind techniques required.
People Finder 2
The sequel to SeQuEl. The query changed, but the vulnerability remains.
People Finder
A people directory with a search feature. The database behind it might share more than names.
PyJail 2
A tighter Python jail with more characters blocked. Think creatively to break free.
PyJail 1
You are trapped in a Python sandbox with restricted input. Escape the jail by executing code despite the blacklist.
Ghost Memory
Memory management is hard. Especially when things are not truly gone.
Your Input, Your Rules
Your input, your rules. But whose memory is it anyway?
No Shortcuts
No shortcuts this time. You are on your own.
Architecture Shift
Same challenge, new architecture. 64 bits change everything.
Credential Gate
The function is there, but it wants the right credentials to cooperate.
Forgotten Function
A small buffer and a forgotten function. Connect the dots.
Tiny Buffer
A tiny buffer with big ambitions. What happens when it overflows?
Pushes
A cookie clicker game tracks your progress. Reaching the target legitimately would take forever. Is there a shortcut?
PHP Sandbox
Upload files to the server with strict extension checks. But the upload is only half the challenge.
PHPFilters 3
Similar to its predecessor, but with a twist β you can view the backend source code. Use it wisely.
PHPFilters 2
A message board processes your input server-side. The frontend filters are just for show.
PHPFilters 1
Execute PHP code despite an extensive blacklist of dangerous functions. Creative bypass required.
Pathfinder 2
The pathfinder returns with a shorter time window. Work faster to enumerate what you need.