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Incorrect Access Control Affecting simple_form package, versions <5.0.0

0.0
high

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.62% (79th percentile)
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NVD
9.8 critical

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  • Snyk ID SNYK-RUBY-SIMPLEFORM-469443
  • published 30 Sep 2019
  • disclosed 27 Sep 2019
  • credit Unknown
Report a new vulnerability Found a mistake?

Introduced: 27 Sep 2019

CVE-2019-16676 Open this link in a new tab
CWE-284 Open this link in a new tab

How to fix?

Upgrade simple_form to version 5.0.0 or higher.

Overview

simple_form is a Forms made easy gem for Rails with simple DSL.

Affected versions of this package are vulnerable to Incorrect Access Control. For pages that build a form using user input, it is possible for an attacker to manipulate the input and send any method present in the form object. This is due to the file_method? in lib/simple_form/form_builder.rb treating a user-supplied string as a method call. The vulnerability is only applicable for pages that build forms based on user input.

PoC

<%= simple_form_for @user do |f| %>
  <%= f.label @user_supplied_string %>
  ...
<% end %>