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Breadcrumb
 1. Home
 2. News & Events
 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


CODESYS DEVELOPMENT SYSTEM

Release Date
August 24, 2023
Alert Code
ICSA-23-236-05



1. EXECUTIVE SUMMARY

 * CVSS v3 9.6
 * ATTENTION: Exploitable remotely/low attack complexity 
 * Vendor: CODESYS, GmbH 
 * Equipment: CODESYS Development System 
 * Vulnerability: Insufficient Verification of Data Authenticity. 


2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to execute
a-man-in-the-middle (MITM) attack to execute arbitrary code. 


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

CODESYS reports this vulnerability affects the following versions of CODESYS
Development System: 

 * CODESYS Development System: versions from 3.5.11.0 and prior to 3.5.19.20 


3.2 VULNERABILITY OVERVIEW

3.2.1 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY CWE-345(link is external) 

In CODESYS Development System versions from 3.5.11.0 and before 3.5.19.20 a
missing integrity check might allow an unauthenticated remote attacker to
manipulate the content of notifications received via HTTP by the CODESYS
notification server. 

CVE-2023-3663 has been assigned to this vulnerability. A CVSS v3 base score of
9.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H(link is external)). 


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing 
 * COUNTRIES/AREAS DEPLOYED: Worldwide 
 * COMPANY HEADQUARTERS LOCATION: Germany 


3.4 RESEARCHER

Sina Kheirkhah of Summoning Team working with Trend Micro Zero Day Initiative
reported this vulnerability. CERT@VDE coordinated the vulnerability. 


4. MITIGATIONS

CODESYS recommends users update the CODESYS Development System to version
3.5.19.20. 

The CODESYS Development System can be downloaded and installed directly with the
CODESYS Installer or be downloaded from the CODESYS Store. 

Alternatively, users may find further information on obtaining the software
update in the CODESYS Update area(link is external). 

For more information, please see the advisory CERT@VDE published for CODESYS
at: 

https://cert.vde.com/en-us/advisories/vde-2023-022(link is external) 

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should: 

 * Minimize network exposure for all control system devices and/or systems, and
   ensure they are not accessible from the Internet. 
 * Locate control system networks and remote devices behind firewalls and
   isolate them from business networks. 
 * When remote access is required, use secure methods, such as virtual private
   networks (VPNs), recognizing VPNs may have vulnerabilities and should be
   updated to the most current version available. Also recognize VPN is only as
   secure as its connected devices. 

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 at cisa.gov/ics. Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies. 

Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents. 

CISA also recommends users take the following measures to protect themselves
from social engineering attacks: 

 * Do not click web links or open attachments in unsolicited email messages. 
 * Refer to Recognizing and Avoiding Email Scams for more information on
   avoiding email scams. 
 * Refer to Avoiding Social Engineering and Phishing Attacks for more
   information on social engineering attacks. 

No known public exploitation specifically targeting this vulnerability has been
reported to CISA at this time. 

This product is provided subject to this Notification and this Privacy &
Use policy.


VENDOR

CODESYS


PLEASE SHARE YOUR THOUGHTS

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RELATED ADVISORIES

Aug 24, 2023
ICS Advisory | ICSA-23-236-02


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ICS Advisory | ICSA-23-236-06


ROCKWELL AUTOMATION INPUT/OUTPUT MODULES

Aug 24, 2023
ICS Advisory | ICSA-23-236-03


CODESYS DEVELOPMENT SYSTEM

Aug 24, 2023
ICS Advisory | ICSA-23-236-01


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