This script enumerates information from remote IMAP services with NTLM authentication enabled.
Ports
Any
Protocols
n/a
Attribution
Nmap Project
Copy the command and adjust the target or script arguments as needed.
nmap -p 143,993 --script imap-ntlm-info <target>The full script source is stored with this entry and is hidden by default to keep the page easier to scan.
local comm = require "comm"
local os = require "os"
local datetime = require "datetime"
local shortport = require "shortport"
local sslcert = require "sslcert"
local stdnse = require "stdnse"
local base64 = require "base64"
local smbauth = require "smbauth"
local string = require "string"
description = [[
This script enumerates information from remote IMAP services with NTLM
authentication enabled.
Sending an IMAP 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 143,993 --script imap-ntlm-info <target>
--
-- @output
-- 143/tcp open imap
-- | imap-ntlm-info:
-- | Target_Name: ACTIVEIMAP
-- | NetBIOS_Domain_Name: ACTIVEIMAP
-- | NetBIOS_Computer_Name: IMAP-TEST2
-- | DNS_Domain_Name: somedomain.com
-- | DNS_Computer_Name: imap-test2.somedomain.com
-- | DNS_Tree_Name: somedomain.com
-- |_ Product_Version: 6.1.7601
--
--@xmloutput
-- <elem key="Target_Name">ACTIVEIMAP</elem>
-- <elem key="NetBIOS_Domain_Name">ACTIVEIMAP</elem>
-- <elem key="NetBIOS_Computer_Name">IMAP-TEST2</elem>
-- <elem key="DNS_Domain_Name">somedomain.com</elem>
-- <elem key="DNS_Computer_Name">imap-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({ 143, 993 }, { "imap", "imaps" })
action = function(host, port)
local output = stdnse.output_table()
local starttls = sslcert.isPortSupported(port)
local socket
if starttls then
local status
status, socket = starttls(host, port)
if not status then
-- could be socket problems, but more likely STARTTLS not supported.
stdnse.debug1("starttls error: %s", socket)
socket = nil
end
end
if not socket then
local line, bopt, first_line
socket, line, bopt, first_line = comm.tryssl(host, port, "" , {recv_before=true})
if not socket then
stdnse.debug1("connection error: %s", line)
return nil
end
end
socket:send("000b AUTHENTICATE NTLM\r\n")
local status, response = socket:receive()
if not status then
stdnse.debug1("Socket receive failed: %s", response)
return nil
end
if not response then
stdnse.debug1("No response to AUTHENTICATE NTLM")
return nil
end
socket:send(ntlm_auth_blob .. "\r\n")
status, response = socket:receive()
if not status then
stdnse.debug1("Socket receive failed: %s", response)
return nil
end
if not response then
stdnse.debug1("No response to NTLM challenge")
return nil
end
local recvtime = os.time()
socket:close()
if string.match(response, "^A%d%d%d%d ") then
stdnse.debug2("NTLM auth not supported.")
return nil
end
-- Continue only if a + response is returned
local response_decoded = string.match(response, "+ (.*)")
if not response_decoded then
stdnse.debug1("Unexpected response to NTLM challenge: %s", response)
return nil
end
local response_decoded = base64.dec(response_decoded)
-- Continue only if NTLMSSP response is returned
if not string.match(response_decoded, "^NTLMSSP") then
stdnse.debug1("Unexpected response to NTLM challenge: %s", response)
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
This script enumerates information from remote IMAP services with NTLM authentication enabled. Sending an IMAP 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.