local comm = require "comm" local os = require "os" local datetime = require "datetime" local bin = require "bin" local shortport = require "shortport" local stdnse = require "stdnse" local base64 = require "base64" local smbauth = require "smbauth" local string = require "string" description = [[ This script enumerates information from remote POP3 services with NTLM authentication enabled. Sending a POP3 NTLM authentication request with null credentials will cause the remote service to respond with a NTLMSSP message disclosing information to include NetBIOS, DNS, and OS build version. ]] --- -- @usage -- nmap -p 110,995 --script pop3-ntlm-info -- -- @output -- 110/tcp open pop3 -- | pop3-ntlm-info: -- | Target_Name: ACTIVEPOP3 -- | NetBIOS_Domain_Name: ACTIVEPOP3 -- | NetBIOS_Computer_Name: POP3-TEST2 -- | DNS_Domain_Name: somedomain.com -- | DNS_Computer_Name: pop3-test2.somedomain.com -- | DNS_Tree_Name: somedomain.com -- |_ Product_Version: 6.1.7601 -- --@xmloutput -- ACTIVEPOP3 -- ACTIVEPOP3 -- POP3-TEST2 -- somedomain.com -- pop3-test2.somedomain.com -- somedomain.com -- 6.1.7601 author = "Justin Cacak" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"default", "discovery", "safe"} local ntlm_auth_blob = base64.enc( select(2, smbauth.get_security_blob(nil, nil, nil, nil, nil, nil, nil, 0x00000001 + -- Negotiate Unicode 0x00000002 + -- Negotiate OEM strings 0x00000004 + -- Request Target 0x00000200 + -- Negotiate NTLM 0x00008000 + -- Negotiate Always Sign 0x00080000 + -- Negotiate NTLM2 Key 0x20000000 + -- Negotiate 128 0x80000000 -- Negotiate 56 )) ) portrule = shortport.port_or_service({ 110, 995 }, { "pop3", "pop3s" }) action = function(host, port) local output = stdnse.output_table() -- Negotiate connection protocol local socket, line, bopt, first_line = comm.tryssl(host, port, "" , {recv_before=true}) if not socket then return end -- Do not attempt to upgrade to a TLS connection if already over TLS if not shortport.ssl(host,port) then -- Attempt to upgrade to a TLS connection if supported (may not be advertised) -- Various implementations *require* this before accepting authentication requests socket:send("STLS\r\n") local status, response = socket:receive() if not status then return end -- Upgrade the connection if STARTTLS permitted, else continue without if string.match(response, ".*OK.*") then status, response = socket:reconnect_ssl() if not status then return end end end socket:send("AUTH NTLM\r\n") local status, response = socket:receive() if not response then return end socket:send(ntlm_auth_blob .. "\r\n") status, response = socket:receive() if not response then return end local recvtime = os.time() socket:close() -- Continue only if a + response is returned if not string.match(response, "+ .*") then return end local response_decoded = base64.dec(string.match(response, "+ (.*)")) -- Continue only if NTLMSSP response is returned if not string.match(response_decoded, "(NTLMSSP.*)") then return nil end -- Leverage smbauth.get_host_info_from_security_blob() for decoding local ntlm_decoded = smbauth.get_host_info_from_security_blob(response_decoded) if ntlm_decoded.timestamp then -- 64-bit number of 100ns clicks since 1/1/1601 local unixstamp = ntlm_decoded.timestamp // 10000000 - 11644473600 datetime.record_skew(host, unixstamp, recvtime) end -- Target Name will always be returned under any implementation output.Target_Name = ntlm_decoded.target_realm -- Display information returned & ignore responses with null values if ntlm_decoded.netbios_domain_name and #ntlm_decoded.netbios_domain_name > 0 then output.NetBIOS_Domain_Name = ntlm_decoded.netbios_domain_name end if ntlm_decoded.netbios_computer_name and #ntlm_decoded.netbios_computer_name > 0 then output.NetBIOS_Computer_Name = ntlm_decoded.netbios_computer_name end if ntlm_decoded.dns_domain_name and #ntlm_decoded.dns_domain_name > 0 then output.DNS_Domain_Name = ntlm_decoded.dns_domain_name end if ntlm_decoded.fqdn and #ntlm_decoded.fqdn > 0 then output.DNS_Computer_Name = ntlm_decoded.fqdn end if ntlm_decoded.dns_forest_name and #ntlm_decoded.dns_forest_name > 0 then output.DNS_Tree_Name = ntlm_decoded.dns_forest_name end if ntlm_decoded.os_major_version then output.Product_Version = string.format("%d.%d.%d", ntlm_decoded.os_major_version, ntlm_decoded.os_minor_version, ntlm_decoded.os_build) end return output end