5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.5%
CVSS v3 9.4
ATTENTION: Exploitable remotely/low skill level to exploit
Vendor: 3S-Smart Software Solutions GmbH
Equipment: CODESYS V3 products
Vulnerabilities: Use of Insufficiently Random Values, Improper Restriction of Communication Channel to Intended Endpoints
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:
3.2.1 USE OF INSUFFICIENTLY RANDOM VALUES CWE-330
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).
3.2.2 IMPROPER RESTRICTION OF COMMUNICATION CHANNEL TO INTENDED ENDPOINTS CWE-923
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:
<https://www.codesys.com/download/>
For more information, all public CODESYS advisories can be found at:
<https://www.codesys.com/security/security-reports.html>
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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20025
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20026
cwe.mitre.org/data/definitions/330.html
cwe.mitre.org/data/definitions/923.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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www.codesys.com/download/
www.codesys.com/security/security-reports.html
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
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mailto:?subject=3S-Smart%20Software%20Solutions%20GmbH%20CODESYS%20V3%20Products&body=www.cisa.gov/news-events/ics-advisories/icsa-18-352-04
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.5%