7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.004 Low
EPSS
Percentile
73.8%
**ATTENTION:**Remotely exploitable/low skill level to exploit.
Vendor: 3S-Smart Software Solutions GmbH
Equipment: CODESYS Web Server
Vulnerability: Stack-based Buffer Overflow
All Microsoft Windows (also WinCE) based CODESYS web servers running stand-alone Version 2.3, or as part of the CODESYS runtime system running prior to Version V1.1.9.19, are affected.
Successful exploitation of this vulnerability could cause the device the attacker is accessing to crash, resulting in a buffer overflow condition that may allow remote code execution.
This vulnerability will be fixed by patch V.1.1.9.19 for the CODESYS V2.3 web server for Windows. This will be part of the CODESYS setup V2.3.9.56. The release of this security patch was made available on January 30, 2018.
Currently, 3S-Smart Software Solutions GmbH has not identified any workarounds for this vulnerability.
In general, 3S-Smart Software Solutions GmbH recommends the following defensive measures to reduce the risk of exploitation of this vulnerability:
For additional information regarding the CODESYS products, or about the described vulnerability, please contact the 3S-Smart Software Solutions support team at this location:
<https://www.codesys.com/support-training/codesys-support.html>
For additional information find the CODESYS Security update at the following location:
<https://customers.codesys.com/fileadmin/data/customers/security/2018/Advisory2018-01_LCDS-282.pdf>
For more information and general recommendations for protecting machines and manufacturing facilities, see the CODESYS Security whitepaper available at this location:
<https://customers.codesys.com/fileadmin/data/customers/security/CODESYS-Security-Whitepaper.pdf>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
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 this vulnerability.
A crafted request may cause a buffer overflow and could therefore execute arbitrary code on the web server or lead to a denial-of-service condition due to a crash in the web server.
CVE-2018-5440 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Zhu WenZhe of Istury IOT security lab reported this vulnerability to NCCIC.
Critical Infrastructure Sectors: Critical Manufacturing, Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Kempten, Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5440
customers.codesys.com/fileadmin/data/customers/security/2018/Advisory2018-01_LCDS-282.pdf
customers.codesys.com/fileadmin/data/customers/security/CODESYS-Security-Whitepaper.pdf
cwe.mitre.org/data/definitions/121.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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www.codesys.com/support-training/codesys-support.html
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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:U/C:H/I:H/A:H
www.instagram.com/cisagov
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-18-032-02
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www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-032-02
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=3S-Smart%20Software%20Solutions%20GmbH%20CODESYS%20Web%20Server&body=www.cisa.gov/news-events/ics-advisories/icsa-18-032-02
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.004 Low
EPSS
Percentile
73.8%