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Diffstat (limited to 'scripts/rdp-ntlm-info.nse')
| -rw-r--r-- | scripts/rdp-ntlm-info.nse | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/scripts/rdp-ntlm-info.nse b/scripts/rdp-ntlm-info.nse new file mode 100644 index 0000000..e13d0a3 --- /dev/null +++ b/scripts/rdp-ntlm-info.nse @@ -0,0 +1,168 @@ +local datetime = require "datetime" +local os = require "os" +local shortport = require "shortport" +local stdnse = require "stdnse" +local smbauth = require "smbauth" +local string = require "string" +local rdp = require "rdp" + +description = [[ +This script enumerates information from remote RDP services with CredSSP +(NLA) authentication enabled. + +Sending an incomplete CredSSP (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 3389 --script rdp-ntlm-info <target> +-- +-- @output +-- 3389/tcp open ms-wbt-server syn-ack ttl 128 Microsoft Terminal Services +-- | rdp-ntlm-info: +-- | Target_Name: W2016 +-- | NetBIOS_Domain_Name: W2016 +-- | NetBIOS_Computer_Name: W16GA-SRV01 +-- | DNS_Domain_Name: W2016.lab +-- | DNS_Computer_Name: W16GA-SRV01.W2016.lab +-- | DNS_Tree_Name: W2016.lab +-- | Product_Version: 10.0.14393 +-- |_ System_Time: 2019-06-13T10:38:35+00:00 +-- +--@xmloutput +-- <elem key="Target_Name">W2016</elem> +-- <elem key="NetBIOS_Domain_Name">W2016</elem> +-- <elem key="NetBIOS_Computer_Name">W16GA-SRV01</elem> +-- <elem key="DNS_Domain_Name">W2016.lab</elem> +-- <elem key="DNS_Computer_Name">W16GA-SRV01.W2016.lab</elem> +-- <elem key="DNS_Tree_Name">W2016.lab</elem> +-- <elem key="Product_Version">10.0.14393</elem> +-- <elem key="System_Time">2019-06-13T10:38:35+00:00</elem> + + + +author = "Tom Sellers" +license = "Same as Nmap--See https://nmap.org/book/man-legal.html" +categories = {"default", "discovery", "safe"} + +portrule = shortport.port_or_service(3389, "ms-wbt-server") + +action = function(host, port) + + local comm = rdp.Comm:new(host, port) + if ( not(comm:connect()) ) then + return nil + end + + local requested_protocol = rdp.PROTOCOL_SSL | rdp.PROTOCOL_HYBRID | rdp.PROTOCOL_HYBRID_EX + local cr = rdp.Request.ConnectionRequest:new(requested_protocol) + local status, _ = comm:exch(cr) + if ( not(status) ) then + comm:close() + return + end + + -- This script could include code to detect which security protocols the + -- target claims that it accepts however that's less than useful because + -- 1. Windows XP doesn't provide that layer of the packet + -- 2. Even when configured for RDP Security only, Windows Server 2008 + -- will still let you connect over TLS and start the CredSSP nego. + + local _, response, recvtime + status, _ = comm.socket:reconnect_ssl() + if status then + stdnse.debug1("Sending NTLM NEGOTIATE..") + + -- NTLMSSP Negotiate request mimicking a Windows 10 client + local NTLM_NEGOTIATE_BLOB = stdnse.fromhex( + "30 37 A0 03 02 01 60 A1 30 30 2E 30 2C A0 2A 04 28" .. + "4e 54 4c 4d 53 53 50 00" .. -- Identifier - NTLMSSP + "01 00 00 00" .. -- Type: NTLMSSP Negotiate - 01 + "B7 82 08 E2 " .. -- Flags (NEGOTIATE_SIGN_ALWAYS | NEGOTIATE_NTLM | NEGOTIATE_SIGN | REQUEST_TARGET | NEGOTIATE_UNICODE) + "00 00 " .. -- DomainNameLen + "00 00" .. -- DomainNameMaxLen + "00 00 00 00" .. -- DomainNameBufferOffset + "00 00 " .. -- WorkstationLen + "00 00" .. -- WorkstationMaxLen + "00 00 00 00" .. -- WorkstationBufferOffset + "0A" .. -- ProductMajorVersion = 10 + "00 " .. -- ProductMinorVersion = 0 + "63 45 " .. -- ProductBuild = 0x4563 = 17763 + "00 00 00" .. -- Reserved + "0F" -- NTLMRevision = 5 = NTLMSSP_REVISION_W2K3 + ) + + -- Not using comm:exch here since that performs some processing on the + -- packet that isn't appropriate in this case. + status, response = comm:send(NTLM_NEGOTIATE_BLOB) + if ( not(status) ) then + return false, response + end + + status, response = comm:recv() + if status then + recvtime = os.time() + end + else + comm:close() + stdnse.debug1("Unable to establish a TLS connection which is required to negotiation CredSSP.") + return + end + + if response == nil then + return + end + + -- Continue only if NTLMSSP response is returned + local start = response:find("NTLMSSP") + if not start then + return nil + end + response = response:sub(start) + + local ntlm_decoded = smbauth.get_host_info_from_security_blob(response) + + local output = stdnse.output_table() + + -- 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 + local product_ver = string.format("%d.%d.%d", + ntlm_decoded.os_major_version, ntlm_decoded.os_minor_version, ntlm_decoded.os_build) + output.Product_Version = product_ver + end + + if ntlm_decoded.timestamp and ntlm_decoded.timestamp > 0 then + -- 64-bit number of 100ns clicks since 1/1/1601 + local unixstamp = ntlm_decoded.timestamp // 10000000 - 11644473600 + datetime.record_skew(host, unixstamp, recvtime) + local sys_time = datetime.format_timestamp( unixstamp, 0) + output.System_Time = sys_time + end + + return output +end |