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AUSCERT External Security Bulletin Redistribution
ESB-2021.1351
Advisory (icsa-21-110-07) Siemens Mendix
21 April 2021
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AusCERT Security Bulletin Summary
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Product: Siemens Mendix
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27394
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-110-07
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ICS Advisory (ICSA-21-110-07)
Siemens Mendix
Original release date: April 20, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.1
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: Mendix
o Vulnerability: Improper Privilege Management
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a non-administrative
user to gain administrative privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports the vulnerability affects the following Mendix products:
o Mendix Applications using Mendix 7: All versions prior to v7.23.19
o Mendix Applications using Mendix 8: All versions prior to v8.17.0
o Mendix Applications using Mendix 8 (v8.12): All versions prior to v8.12.5
o Mendix Applications using Mendix 8 (v8.6): All versions prior to v8.6.9
o Mendix Applications using Mendix 9: All versions prior to v9.0.5
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269
Authenticated, non-administrative users could modify their privileges by
manipulating the user role under certain circumstances, allowing them to gain
administrative privileges.
CVE-2021-27394 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
FlowFabric BV reported this vulnerability to Siemens.
4. MITIGATIONS
Mendix has released an update for Mendix and recommends updating to the latest
version. In SSA-875726 , Siemens lists the following remediations:
o Mendix Applications using Mendix 7: Update Mendix Project to v7.23.19 or
later version and redeploy the application.
o Mendix Applications using Mendix 8: Update Mendix Project to v8.17.0 or
later version and redeploy the application.
o Mendix Applications using Mendix 8 (v8.12): Update Mendix Project to
v8.12.5 or later and preferably the latest V8.18 version and redeploy the
application.
o Mendix Applications using Mendix 8 (v8.6): Update Mendix Project to v8.6.9
or later and preferably the latest V8.18 version and redeploy the
application.
o Mendix Applications using Mendix 9: Update Mendix Project to v9.0.5 or
later version and redeploy the application.
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens' operational guidelines for industrial security , and
following the recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. CISA reminds organizations to perform
proper impact analysis and risk assessment prior to deploying defensive
measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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