tl;dr

• Reverse to find unique function not containing bad stack canary
• Libc leak using format string vulnerability in printf
• ROP chain to get shell

tl;dr

• Analysis of eBPF assembly
• Simple optimization

tl;dr

• Custom hook to syscall 0x31337 using eBPF
• Check on the argument passed to syscall to verify correct/incorrect key

tl;dr

• This challenge is a JIT VM
• The VM logic implements modular equations

tl;dr

• This challenge comes under easy level challenge.
• The binary has a script being executed using execvp.