Rev/so_much
207 points
strcmp printf File
Solution
I’ve used ghidra to have a look into the decompiled code.
After quick examination I’ve came to conclusion that the code base on strcmp function. I’ve decided to override this function with my own implementation.
Prepared below code:
#define _GNU_SOURCE
int strcmp ( char * str1, char * str2 )
{
return 0;
}
int main()
{
return 0;
}Compiled it and executed the program with LD_PRELOAD.
gcc -ldl -fpic -nostartfiles -shared mystrcmp.c -o mystrcmp.so
sudo LD_PRELOAD=./mystrcmp.so ./so_much anything
darkCTF{w0ws0m4ny_funct10ns}