Hi folks,
I have this c code:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int ssp(char * str)
{
char buffer[100];
strcpy(buffer,str);
return 1;
}
int main(int argc, char **argv)
{
char str[400];
FILE * afile;
afile = fopen("afile", "r");
fread(str, sizeof(char), 400, afile);
ssp(str);
printf("Returned Properly\n");
return 1;
}
The program provided reads the contents of a file called "afile"
into a character array called str
, which can hold up to 400 characters. It then calls the ssp
function and passes str
as an argument.
The ssp
function copies the contents of the str
character array into a local character array called buffer. The strcpy
function used to copy the string data does not perform any bounds checking, which can lead to buffer overflow vulnerabilities if the input string is longer than the buffer size.
However, the lack of bounds checking in the strcpy
function in the ssp
function can potentially lead to buffer overflow vulnerabilities if used in a larger program or in an environment with untrusted input data.
Could anyone please assist with a shellcode at the end of "afile" and then store the shellcode on the stack to run? Please...
Top comments (1)
Ages ago I worked on C .
Hopefully this pseduo code gives a safer programming practices to avoid the overflow issue.