XOR Encoder - Metasploit


This page contains detailed information about how to use the encoder/mipsbe/longxor metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

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Module Overview

Name: XOR Encoder
Module: encoder/mipsbe/longxor
Source code: modules/encoders/mipsbe/longxor.rb
Disclosure date: -
Last modification time: 2018-12-18 13:35:16 +0000
Supported architecture(s): mipsbe
Supported platform(s): All
Target service / protocol: -
Target network port(s): -
List of CVEs: -

Mips Web server exploit friendly xor encoder

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

msf > use encoder/mipsbe/longxor
msf encoder(longxor) > show targets
    ... a list of targets ...
msf encoder(longxor) > set TARGET target-id
msf encoder(longxor) > show options
    ... show and set options ...
msf encoder(longxor) > exploit

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Msfconsole Usage

Here is how the encoder/mipsbe/longxor module looks in the msfconsole:

msf6 > use encoder/mipsbe/longxor

msf6 encoder(mipsbe/longxor) > show info

       Name: XOR Encoder
     Module: encoder/mipsbe/longxor
   Platform: All
       Arch: mipsbe
       Rank: Normal

Provided by:
  Julien Tinnes <[email protected]>
  Pedro Ribeiro <[email protected]>

Description:
  Mips Web server exploit friendly xor encoder

Module Options

This is a complete list of options available in the encoder/mipsbe/longxor module:

msf6 encoder(mipsbe/longxor) > show options

Module options (encoder/mipsbe/longxor):

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

Advanced Options

Here is a complete list of advanced options supported by the encoder/mipsbe/longxor module:

msf6 encoder(mipsbe/longxor) > show advanced

Module advanced options (encoder/mipsbe/longxor):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   VERBOSE    false            no        Enable detailed status messages
   WORKSPACE                   no        Specify the workspace for this module

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Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

The payload being encoded is too long (<STATE.BUF.LENGTH> bytes)

Here is a relevant code snippet related to the "The payload being encoded is too long (<STATE.BUF.LENGTH> bytes)" error message:

33:	  #
34:	  def decoder_stub(state)
35:	
36:	    # add one xor operation for the key (see comment below)
37:	    number_of_passes=state.buf.length/4+1
38:	    raise EncodingError.new("The payload being encoded is too long (#{state.buf.length} bytes)") if number_of_passes > 10240
39:	    raise EncodingError.new("The payload is not padded to 4-bytes (#{state.buf.length} bytes)") if state.buf.length%4 != 0
40:	
41:	    # 16-bits not (again, see below)
42:	    reg_10 = (number_of_passes+1)^0xFFFF
43:	    reg_5 = state.buf.length^0xFFFF

The payload is not padded to 4-bytes (<STATE.BUF.LENGTH> bytes)

Here is a relevant code snippet related to the "The payload is not padded to 4-bytes (<STATE.BUF.LENGTH> bytes)" error message:

34:	  def decoder_stub(state)
35:	
36:	    # add one xor operation for the key (see comment below)
37:	    number_of_passes=state.buf.length/4+1
38:	    raise EncodingError.new("The payload being encoded is too long (#{state.buf.length} bytes)") if number_of_passes > 10240
39:	    raise EncodingError.new("The payload is not padded to 4-bytes (#{state.buf.length} bytes)") if state.buf.length%4 != 0
40:	
41:	    # 16-bits not (again, see below)
42:	    reg_10 = (number_of_passes+1)^0xFFFF
43:	    reg_5 = state.buf.length^0xFFFF
44:	    decoder = Metasm::Shellcode.assemble(Metasm::MIPS.new(:big), <<EOS).encoded.data

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See Also

Check also the following modules related to this module:

Authors

Version

This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.

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