Can you make this program crash?  `nc 0.cloud.chals.io 17289`  
[crashme](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/pwn/crashme)  [crashme.c](https://github.com/Nightxade/ctf-writeups/blob/master/assets/CTFs/Cyber-Cooperative-CTF-2023/pwn/crashme.c)  
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We're given an ELF binary, a C source file, and a service to connect to. Here's `crashme.c`:  
```c#include <stdio.h>#include <string.h>#include <stdlib.h>
int main(int argc, char *argv[]){    char buffer[32];    printf("Give me some data: \n");    fflush(stdout);    fgets(buffer, 64, stdin);    printf("You entered %s\n", buffer);    fflush(stdout);    return 0;}```
Seems like a very simple program. Simple programs require simple methods. `fgets()` can be vulnerable to buffer overflow, so why don't we try to send a large number of characters? I sent `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` to the local program, which immediately resulted in a `Segmentation fault`.  
This is what we need then! Send the same input to the program to get the flag:  
    flag{segfaults_a_hackers_best_friend}