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# SSA-352521: Access Check Bypass Vulnerability in Mendix

Publication Date:        2021-07-13
Last Update:             2021-07-13
Current Version:         1.0
CVSS v3.1 Base Score:    5.3

SUMMARY
=======

An incorrect authorization check in Mendix applications could allow an
attacker to bypass write permissions to attributes of objects under
certain circumstances.

Mendix has released an update for Mendix and recommends to update to the
latest version.


AFFECTED PRODUCTS AND SOLUTION
==============================


* Mendix Applications using Mendix 7 
  - Affected versions:
       All versions < V7.23.22
  - Remediation:
       Update to V7.23.22 or later version
  - Download:
       https://docs.mendix.com/releasenotes/studio-pro/7.23

* Mendix Applications using Mendix 8 
  - Affected versions:
       All versions < V8.18.7
  - Remediation:
       Update to V8.18.7 or later version
  - Download:
       https://docs.mendix.com/releasenotes/studio-pro/8.18

* Mendix Applications using Mendix 9 
  - Affected versions:
       All versions < V9.3.0
  - Remediation:
       Update to V9.3.0 or later version
  - Download:
       https://docs.mendix.com/releasenotes/studio-pro/9.3


WORKAROUNDS AND MITIGATIONS
===========================

Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:

* Make the first attribute of the object non-writeable

* Add a new read attribute and move this up to become the first in the
entity attribute table



GENERAL SECURITY RECOMMENDATIONS
================================

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found
at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION
===================

Mendix is a high productivity app platform that enables you to build and
continuously improve mobile and
 web applications at scale. The Mendix
Platform is designed to accelerate enterprise app delivery across
 your
entire application development lifecycle, from ideation to deployment
and operations.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2021-33718

  Write access checks of attributes of an object could be bypassed, if
  user has a write permissions to the first attribute of this object.

  CVSS v3.1 Base Score: 5.3
  CVSS Vector:          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-863: Incorrect Authorization




ADDITIONAL INFORMATION
======================

For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT:

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2021-07-13): Publication Date

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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