1 files changed, 161 insertions, 0 deletions
diff --git a/scripts/pop3-ntlm-info.nse b/scripts/pop3-ntlm-info.nse
new file mode 100644
index 0000000..9f401a3
--- /dev/null
+++ b/scripts/pop3-ntlm-info.nse
@@ -0,0 +1,161 @@
+local comm = require "comm"
+local os = require "os"
+local datetime = require "datetime"
+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 <target>
+--
+-- @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
+-- <elem key="Target_Name">ACTIVEPOP3</elem>
+-- <elem key="NetBIOS_Domain_Name">ACTIVEPOP3</elem>
+-- <elem key="NetBIOS_Computer_Name">POP3-TEST2</elem>
+-- <elem key="DNS_Domain_Name">somedomain.com</elem>
+-- <elem key="DNS_Computer_Name">pop3-test2.somedomain.com</elem>
+-- <elem key="DNS_Tree_Name">somedomain.com</elem>
+-- <elem key="Product_Version">6.1.7601</elem>
+
+
+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