Amateurctf

Sending a shebang to let fexecve execute a command for us and get the flag.

Crafting a custom ELF binary in assembly to execute /bin/sh and inject that inside the file descriptor using memfd_create and fexecve.

Exploiting srand(time(NULL)) to match the generated canary and then overflowing a buffer by generating another random number.

Utilizing LFI in the theme parameter to get the flag.

Utilizing Latex to read files from the local system.

Utilizing integer overflow in the cookie to make the web-app wait for -inf time.