Created
January 23, 2017 10:38
-
-
Save CreateRemoteThread/7c2ed0ae2e73b80c880886fe4bdc68d0 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/python | |
import sys | |
import pwn | |
import copy | |
import os | |
# brute force best force wins again | |
# fuck trying to reverse this shit | |
pwn.context.log_level = 'error' | |
f = open("testrand","r") | |
d = f.read() | |
f.close() | |
d_r = d.rstrip() | |
orig_str = "AAAAAAAA" | |
lock = [0,0,0,0,0,0,0,0] | |
def bf_try(change_posn,change_char): | |
global orig_str | |
global lock | |
data_to_send = bytearray(copy.copy(orig_str)) | |
data_to_send[change_posn] = change_char | |
for lc in range(0,8): | |
if lock[lc] != 0: | |
data_to_send[lc] = lock[lc] | |
i = 0 | |
p = pwn.process(["./qemu-mips","bender_patched"]) | |
try: | |
p.recvuntil(d_r) | |
# print "okay, received %s" % d.rstrip() | |
p.sendline(data_to_send) | |
p.wait_for_close() | |
ret = p.poll(block=True) | |
except: | |
ret = 139 | |
del data_to_send | |
return ret | |
chars = "abcdefghijklmnopqrstuvwxyxABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" | |
def bf_harness(current_check): | |
global lock | |
for i in range(0,8): | |
if lock[i] != 0: | |
print " [<] attempting check %d, char %d locked, continuing" % (current_check,i) | |
continue | |
for c in chars: | |
if i == 7: | |
print "lock 7 (status %s) attempting mutation %d:%c" % (lock,i,c) | |
ret = bf_try(i,c) | |
crashcount = 0 | |
while ret == 139: | |
crashcount += 1 | |
if crashcount > 2: | |
print " [!] too many crashes i = %d (return = %d), breaking" % (i,ret) | |
break | |
print " [!] crashed while iterating i = %d (return = %d), retrying" % (i,ret) | |
os.system("rm *.core") | |
ret = bf_try(i,c) | |
if ret == 139: | |
print " [!] noping out" | |
return | |
if ret != current_check: | |
print " [>] locking %d at %c" % (i,c) | |
lock[i] = c | |
return | |
if __name__ == "__main__": | |
for i in range(0,8): | |
bf_harness(i) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment