CVSS v3 9.4
ATTENTION: Exploitable remotely/low skill level to exploit
Successful exploitation of these vulnerabilities could allow a remote attacker to disguise the source of malicious communication packets and also exploit a random values weakness affecting confidentiality and integrity of data stored on the device.
3S-Smart Software Solutions GmbH reports these vulnerabilities affect the following CODESYS V3 products:
The application suffers from weak random values that can affect the confidentiality and integrity of data stored on the device.
CVE-2018-20025 has been assigned to this vulnerability. A CVSS v3 base score of 9.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
The application does not properly restrict communication channels, allowing the source of communication packets to be spoofed.
CVE-2018-20026 has been assigned to this vulnerability. A CVSS v3 base score of 5.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N).
Alexander Nochvay from Kaspersky Lab reported these vulnerabilities to 3-S Smart Software Solutions GmbH.
3-S Smart Software Solutions GmbH has released a new version of the software that can be downloaded from:
For more information, all public CODESYS advisories can be found at:
3S-Smart Software Solutions GmbH recommends the following general defensive measures to reduce the risk of exploitation of these vulnerabilities:
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
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For industrial control systems cybersecurity information: https://www.us-cert.gov/ics
or incident reporting: https://www.us-cert.gov/report
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