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local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local ipOps = require "ipOps"
description = [[
Determines if the web server leaks its internal IP address when sending an HTTP/1.0 request without a Host header.
Some misconfigured web servers leak their internal IP address in the response
headers when returning a redirect response. This is a known issue for some
versions of Microsoft IIS, but affects other web servers as well.
]]
---
-- @usage nmap --script http-internal-ip-disclosure <target>
-- @usage nmap --script http-internal-ip-disclosure --script-args http-internal-ip-disclosure.path=/path <target>
--
-- @args http-internal-ip-disclosure.path Path to URI. Default: /
--
-- @output
-- 80/tcp open http syn-ack
-- | http-internal-ip-disclosure:
-- |_ Internal IP Leaked: 10.0.0.2
--
-- @xmloutput
-- <elem key="Internal IP Leaked">10.0.0.2</elem>
--
-- @see ssl-cert-intaddr.nse
author = "Josh Amishav-Zlatin"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = { "vuln", "discovery", "safe" }
portrule = shortport.http
local function generateHttpV1_0Req(host, port, path)
local redirectIP, privateIP
local socket = nmap.new_socket()
socket:connect(host, port)
local cmd = "GET " .. path .. " HTTP/1.0\r\n\r\n"
socket:send(cmd)
while true do
local status, lines = socket:receive_lines(1)
if not status then
break
end
-- Check if the response contains a location header
if lines:match("Location") then
local locTarget = lines:match("Location: [%a%p%d]+")
-- Check if the redirect location contains an IP address
redirectIP = locTarget:match("[%d%.]+")
if redirectIP then
privateIP = ipOps.isPrivate(redirectIP)
end
stdnse.debug1("Location: %s", locTarget )
stdnse.debug1("Internal IP: %s", redirectIP )
end
end
socket:close()
-- Only report if the internal IP leaked is different then the target IP
if privateIP and redirectIP ~= host.ip then
return redirectIP
end
end
action = function(host, port)
local output = stdnse.output_table()
local path = stdnse.get_script_args(SCRIPT_NAME .. ".path") or "/"
local IP = generateHttpV1_0Req(host, port, path)
-- Check /images which is often vulnerable on some unpatched IIS servers
if not IP and path ~= "/images" then
path = "/images"
IP = generateHttpV1_0Req(host, port, path)
end
if IP then
output["Internal IP Leaked"] = IP
return output
end
end
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