module

Ruby on Rails Dynamic Render File Upload Remote Code Execution

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Disclosed
10/16/2016
Created
05/30/2018

Description

This module exploits a remote code execution vulnerability in the explicit render
method when leveraging user parameters.
This module has been tested across multiple versions of Ruby on Rails.
The technique used by this module requires the specified
endpoint to be using dynamic render paths, such as the following example:

def show
render params[:id]
end

Also, the vulnerable target will need a POST endpoint for the TempFile upload, this
can literally be any endpoint. This module doesnt use the log inclusion method of
exploitation due to it not being universal enough. Instead, a new code injection
technique was found and used whereby an attacker can upload temporary image files
against any POST endpoint and use them for the inclusion attack. Finally, you only
get one shot at this if you are testing with the builtin rails server, use caution.

Authors

mr_me John Poulin (forced-request)

Platform

BSD,Linux

Architectures

x86

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:

    msf > use exploit/multi/http/rails_dynamic_render_code_exec
    msf /(c) > show actions
        ...actions...
    msf /(c) > set ACTION < action-name >
    msf /(c) > show options
        ...show and set options...
    msf /(c) > run
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