Avoid UTF8/tolower - Metasploit


This page contains detailed information about how to use the encoder/x86/avoid_utf8_tolower metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

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Module Overview

Name: Avoid UTF8/tolower
Module: encoder/x86/avoid_utf8_tolower
Source code: modules/encoders/x86/avoid_utf8_tolower.rb
Disclosure date: -
Last modification time: 2017-07-24 06:26:21 +0000
Supported architecture(s): x86
Supported platform(s): All
Target service / protocol: -
Target network port(s): -
List of CVEs: -

UTF8 Safe, tolower Safe Encoder

Module Ranking and Traits

Module Ranking:

  • manual: The exploit is unstable or difficult to exploit and is basically a DoS. This ranking is also used when the module has no use unless specifically configured by the user (e.g.: exploit/windows/smb/psexec). More information about ranking can be found here.

Basic Usage

msf > use encoder/x86/avoid_utf8_tolower
msf encoder(avoid_utf8_tolower) > show targets
    ... a list of targets ...
msf encoder(avoid_utf8_tolower) > set TARGET target-id
msf encoder(avoid_utf8_tolower) > show options
    ... show and set options ...
msf encoder(avoid_utf8_tolower) > exploit

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Msfconsole Usage

Here is how the encoder/x86/avoid_utf8_tolower module looks in the msfconsole:

msf6 > use encoder/x86/avoid_utf8_tolower

msf6 encoder(x86/avoid_utf8_tolower) > show info

       Name: Avoid UTF8/tolower
     Module: encoder/x86/avoid_utf8_tolower
   Platform: All
       Arch: x86
       Rank: Manual

Provided by:
  skape <[email protected]>

Description:
  UTF8 Safe, tolower Safe Encoder

Module Options

This is a complete list of options available in the encoder/x86/avoid_utf8_tolower module:

msf6 encoder(x86/avoid_utf8_tolower) > show options

Module options (encoder/x86/avoid_utf8_tolower):

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

Advanced Options

Here is a complete list of advanced options supported by the encoder/x86/avoid_utf8_tolower module:

msf6 encoder(x86/avoid_utf8_tolower) > show advanced

Module advanced options (encoder/x86/avoid_utf8_tolower):

   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 of an incompatible size (<LEN> bytes)

Here is a relevant code snippet related to the "The payload being encoded is of an incompatible size (<LEN> bytes)" error message:

116:	    # to get the context register to point immediately after the stub header
117:	    off = (datastore['BufferOffset'] || 0).to_i
118:	
119:	    # Check to make sure that the length is a valid size
120:	    if is_badchar(state, len)
121:	      raise EncodingError.new("The payload being encoded is of an incompatible size (#{len} bytes)")
122:	    end
123:	
124:	    decoder =
125:	      "\x6a" + [len].pack('C')      +  # push len
126:	      "\x6b\x3c\x24\x0b"            +  # imul 0xb

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See Also

Check also the following modules related to this module:

Authors

skape

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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