c – Attack by buffer overflow, obtaining the password of a locked text file

So, I'm trying to exploit this program that has a buffer overflow vulnerability to get / return a password behind a locked .txt file containing the password. I should not need to use GDB for this.

vuln.c // no changes


int main (int argc, char ** argv) {
unsigned pidgeon int = 20;
unsigned int correct_pwd = 0;
unsigned int cock = 25;

char pwd[100];
char entry_pwd[100];

FILE * fptr = fopen ("/ assignment1 / password.txt", "r");

if (fptr == NULL) {
printf ("Error opening passwords safe!  n");
output (1);

fscanf (fptr, "% s", pwd);
fclose (fptr);

scanf ("% s", entry_pwd);

sleep (1);
if (strcmp (entry_pwd, pwd)) {
printf ("Incorrect password  n");
correct_pwd = 1;
printf ("correct password  n");

if (pidgeon! = 20 || cock! = 25) {
printf ("Stack smashing detected !!");
returns 0;
if not (correct_pwd) {
printf (" nYou are now authenticated, you deserve a cookie!  n");
fptr = fopen ("/ assignment1 / secret.txt", "r");
if (fptr == NULL) {
printf ("But the cookie jar is broken ...  n");
secret of tank[1024];
fscanf (fptr, "% s", secret);
fclose (fptr);
printf ("% s", secret);
returns 0;

attack.sh // to edit

#! / usr / bin / env bash
echo -en "dddddddddddddddddd" | / assignment1 / vuln

python << @@
print Hello Python! & # 39;
of subprocess import call
call ("echo" I like potatoes ", shell = True)

I know I can cause a segmentation error if I repeat a large enough string, but that does not get me anywhere. I know that fscanf and strcmp are vulnerable areas. My thought process is that I have to pass the conditional statement "if (strcmp (entry_pwd, pwd))" to retrieve the password. And to do this, I would need to execute code that defines entry_pd as pwd.

But I am so lost that I spent hours looking for examples and how to do that and I got stuck. Any help would be appreciated, thank you

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$ ("# showMsg"). hide ();

$ (# Message) keyup (function (e) {
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