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