9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.973 High
EPSS
Percentile
99.8%
Exploits the Max-Forwards HTTP header to detect the presence of reverse proxies.
The script works by sending HTTP requests with values of the Max-Forwards HTTP header varying from 0 to 2 and checking for any anomalies in certain response values such as the status code, Server, Content-Type and Content-Length HTTP headers and body values such as the HTML title.
Based on the work of:
For more information, see:
The path to send requests to. Defaults to /
.
HTTP request method to use. Defaults to GET
. Among other values, TRACE is probably the most interesting.
See the documentation for the slaxml library.
See the documentation for the http library.
See the documentation for the smbauth library.
nmap --script=http-traceroute <targets>
PORT STATE SERVICE REASON
80/tcp open http syn-ack
| http-traceroute:
| HTML title
| Hop #1: Twitter / Over capacity
| Hop #2: t.co / Twitter
| Hop #3: t.co / Twitter
| Status Code
| Hop #1: 502
| Hop #2: 200
| Hop #3: 200
| server
| Hop #1: Apache
| Hop #2: hi
| Hop #3: hi
| content-type
| Hop #1: text/html; charset=UTF-8
| Hop #2: text/html; charset=utf-8
| Hop #3: text/html; charset=utf-8
| content-length
| Hop #1: 4833
| Hop #2: 3280
| Hop #3: 3280
| last-modified
| Hop #1: Thu, 05 Apr 2012 00:19:40 GMT
| Hop #2
|_ Hop #3
local http = require "http"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local table = require "table"
description = [[
Exploits the Max-Forwards HTTP header to detect the presence of reverse proxies.
The script works by sending HTTP requests with values of the Max-Forwards HTTP
header varying from 0 to 2 and checking for any anomalies in certain response
values such as the status code, Server, Content-Type and Content-Length HTTP
headers and body values such as the HTML title.
Based on the work of:
* Nicolas Gregoire ([email protected])
* Julien Cayssol ([email protected])
For more information, see:
* http://www.agarri.fr/kom/archives/2011/11/12/traceroute-like_http_scanner/index.html
]]
---
-- @args http-traceroute.path The path to send requests to. Defaults to <code>/</code>.
-- @args http-traceroute.method HTTP request method to use. Defaults to <code>GET</code>.
-- Among other values, TRACE is probably the most interesting.
--
-- @usage
-- nmap --script=http-traceroute <targets>
--
--@output
-- PORT STATE SERVICE REASON
-- 80/tcp open http syn-ack
-- | http-traceroute:
-- | HTML title
-- | Hop #1: Twitter / Over capacity
-- | Hop #2: t.co / Twitter
-- | Hop #3: t.co / Twitter
-- | Status Code
-- | Hop #1: 502
-- | Hop #2: 200
-- | Hop #3: 200
-- | server
-- | Hop #1: Apache
-- | Hop #2: hi
-- | Hop #3: hi
-- | content-type
-- | Hop #1: text/html; charset=UTF-8
-- | Hop #2: text/html; charset=utf-8
-- | Hop #3: text/html; charset=utf-8
-- | content-length
-- | Hop #1: 4833
-- | Hop #2: 3280
-- | Hop #3: 3280
-- | last-modified
-- | Hop #1: Thu, 05 Apr 2012 00:19:40 GMT
-- | Hop #2
-- |_ Hop #3
author = "Hani Benhabiles"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
portrule = shortport.service("http")
--- Attempts to extract the html title
-- from an HTTP response body.
--@param responsebody Response's body.
local function extract_title (responsebody)
return responsebody:match "<title>(.-)</title>"
end
--- Attempts to extract the X-Forwarded-For header
-- from an HTTP response body in case of TRACE requests.
--@param responsebody Response's body.
local function extract_xfwd (responsebody)
return responsebody:match "X-Forwarded-For: [^\r\n]*"
end
--- Check for differences in response headers, status code
-- and html title between responses.
--@param responses Responses to compare.
--@param method Used HTTP method.
local compare_responses = function(responses, method)
local response, key
local results = {}
local result = {}
local titles = {}
local interesting_headers = {
'server',
'via',
'x-via',
'x-forwarded-for',
'content-type',
'content-length',
'last-modified',
'location',
}
-- Check page title
for key,response in pairs(responses) do
titles[key] = extract_title(response.body)
end
if titles[1] ~= titles[2] or
titles[1] ~= titles[3] then
table.insert(results, 'HTML title')
for key,response in pairs(responses) do
table.insert(result, "Hop #" .. key .. ": " .. titles[key])
end
table.insert(results, result)
end
-- Check status code
if responses[1].status == 502 or
responses[1].status == 483 or
responses[1].status ~= responses[2].status or
responses[1].status ~= responses[3].status then
result = {}
table.insert(results, 'Status Code')
for key,response in pairs(responses) do
table.insert(result, "Hop #" .. key .. ": " .. tostring(response.status))
end
table.insert(results, result)
end
-- Check headers
for _,header in pairs(interesting_headers) do
-- Compare header of different responses
if responses[1].header[header] ~= responses[2].header[header] or
responses[1].header[header] ~= responses[3].header[header] then
result = {}
table.insert(results, header)
for key,response in pairs(responses) do
if response.header[header] ~= nil then
table.insert(result, "Hop #" .. key .. ": " .. tostring(response.header[header]))
else
table.insert(result, "Hop #" .. key)
end
end
table.insert(results, result)
end
end
-- Check for X-Forwarded-For in the response body
-- when using TRACE method
if method == "TRACE" then
local xfwd = extract_xfwd(responses[1].body)
if xfwd ~= nil then
table.insert(results, xfwd)
end
end
return results
end
action = function(host, port)
local path = stdnse.get_script_args(SCRIPT_NAME .. '.path') or "/"
local method = stdnse.get_script_args(SCRIPT_NAME .. '.method') or "GET"
local responses = {}
local detected = "Possible reverse proxy detected."
for i = 0,2 do
local response = http.generic_request(host, port, method, path, { ['header'] = { ['Max-Forwards'] = i }, ['no_cache'] = true})
table.insert(responses, response)
end
-- Check results
local results = compare_responses(responses, method)
if results ~= nil and nmap.verbosity() == 1 then
return stdnse.format_output(true,detected)
else
return stdnse.format_output(true,results)
end
end
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.973 High
EPSS
Percentile
99.8%