Microsoft Windows MS17-010 SMB Remote Code Execution

2017.04.18
Credit: Sean Dillon
Risk: High
Local: No
Remote: Yes
CWE: N/A

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## # auxiliary/scanner/smb/smb_ms_17_010 require 'msf/core' class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::SMB::Client include Msf::Exploit::Remote::SMB::Client::Authenticated include Msf::Auxiliary::Scanner include Msf::Auxiliary::Report def initialize(info = {}) super(update_info(info, 'Name' => 'MS17-010 SMB RCE Detection', 'Description' => %q{ Uses information disclosure to determine if MS17-010 has been patched or not. Specifically, it connects to the IPC$ tree and attempts a transaction on FID 0. If the status returned is "STATUS_INSUFF_SERVER_RESOURCES", the machine does not have the MS17-010 patch. This module does not require valid SMB credentials in default server configurations. It can log on as the user "\" and connect to IPC$. }, 'Author' => [ 'Sean Dillon <sean.dillon@risksense.com>' ], 'References' => [ [ 'CVE', '2017-0143'], [ 'CVE', '2017-0144'], [ 'CVE', '2017-0145'], [ 'CVE', '2017-0146'], [ 'CVE', '2017-0147'], [ 'CVE', '2017-0148'], [ 'MSB', 'MS17-010'], [ 'URL', 'https://technet.microsoft.com/en-us/library/security/ms17-010.aspx'] ], 'License' => MSF_LICENSE )) end def run_host(ip) begin status = do_smb_probe(ip) if status == "STATUS_INSUFF_SERVER_RESOURCES" print_warning("Host is likely VULNERABLE to MS17-010!") report_vuln( host: ip, name: self.name, refs: self.references, info: 'STATUS_INSUFF_SERVER_RESOURCES for FID 0 against IPC$' ) elsif status == "STATUS_ACCESS_DENIED" or status == "STATUS_INVALID_HANDLE" # STATUS_ACCESS_DENIED (Windows 10) and STATUS_INVALID_HANDLE (others) print_good("Host does NOT appear vulnerable.") else print_bad("Unable to properly detect if host is vulnerable.") end rescue ::Interrupt print_status("Exiting on interrupt.") raise $! rescue ::Rex::Proto::SMB::Exceptions::LoginError print_error("An SMB Login Error occurred while connecting to the IPC$ tree.") rescue ::Exception => e vprint_error("#{e.class}: #{e.message}") ensure disconnect end end def do_smb_probe(ip) connect # logon as user \ simple.login(datastore['SMBName'], datastore['SMBUser'], datastore['SMBPass'], datastore['SMBDomain']) # connect to IPC$ ipc_share = "\\\\#{ip}\\IPC$" simple.connect(ipc_share) tree_id = simple.shares[ipc_share] print_status("Connected to #{ipc_share} with TID = #{tree_id}") # request transaction with fid = 0 pkt = make_smb_trans_ms17_010(tree_id) sock.put(pkt) bytes = sock.get_once # convert packet to response struct pkt = Rex::Proto::SMB::Constants::SMB_TRANS_RES_HDR_PKT.make_struct pkt.from_s(bytes[4..-1]) # convert error code to string code = pkt['SMB'].v['ErrorClass'] smberr = Rex::Proto::SMB::Exceptions::ErrorCode.new status = smberr.get_error(code) print_status("Received #{status} with FID = 0") status end def make_smb_trans_ms17_010(tree_id) # make a raw transaction packet pkt = Rex::Proto::SMB::Constants::SMB_TRANS_PKT.make_struct simple.client.smb_defaults(pkt['Payload']['SMB']) # opcode 0x23 = PeekNamedPipe, fid = 0 setup = "\x23\x00\x00\x00" setup_count = 2 # 2 words trans = "\\PIPE\\\x00" # calculate offsets to the SetupData payload base_offset = pkt.to_s.length + (setup.length) - 4 param_offset = base_offset + trans.length data_offset = param_offset # + 0 # packet baselines pkt['Payload']['SMB'].v['Command'] = Rex::Proto::SMB::Constants::SMB_COM_TRANSACTION pkt['Payload']['SMB'].v['Flags1'] = 0x18 pkt['Payload']['SMB'].v['Flags2'] = 0x2801 # 0xc803 would unicode pkt['Payload']['SMB'].v['TreeID'] = tree_id pkt['Payload']['SMB'].v['WordCount'] = 14 + setup_count pkt['Payload'].v['ParamCountMax'] = 0xffff pkt['Payload'].v['DataCountMax'] = 0xffff pkt['Payload'].v['ParamOffset'] = param_offset pkt['Payload'].v['DataOffset'] = data_offset # actual magic: PeekNamedPipe FID=0, \PIPE\ pkt['Payload'].v['SetupCount'] = setup_count pkt['Payload'].v['SetupData'] = setup pkt['Payload'].v['Payload'] = trans pkt.to_s end end


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