CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
25.6%
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemensβ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
This updated advisory is a follow-up to the advisory update titled ICSA-18-079-02 Siemens SIMATIC, SINUMERIK, and PROFINET IO (Update C) that was published May 14, 2019, on the on the ICS webpage on us-cert.gov.
Successful exploitation of this vulnerability could result in a denial-of-service condition requiring a manual restart to recover the system.
Siemens reports that the vulnerability affects the following products:
--------- Begin Update D Part 1 of 2 ---------
--------- End Update D Part 1 of 2 ---------
Responding to a PROFINET DCP request with a specially crafted PROFINET DCP packet could result in a denial-of-service condition of the requesting system. This vulnerability could be exploited if the attacker is located on the same Ethernet segment (OSI Layer 2) as the targeted device.
CVE-2018-4843 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens ProductCERT reported this vulnerability to NCCIC.
Siemens has provided the following updates for mitigations:
<https://support.industry.siemens.com/cs/ww/en/view/109478528>
<https://support.industry.siemens.com/cs/ww/en/view/109478459>
<https://support.industry.siemens.com/cs/ww/en/view/109474874>
<https://support.industry.siemens.com/cs/ww/en/view/109476571>
<https://support.industry.siemens.com/cs/ww/en/ps/13752/dl>
<https://support.industry.siemens.com/cs/ww/en/view/109474550>
--------- Begin Update D Part 2 of 2 ---------
<https://support.industry.siemens.com/cs/ww/en/view/109765109>
--------- End Update D Part 2 of 2 ---------
For all other affected products, Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. To run the devices in a protected IT environment, Siemens particularly recommends configuring the environment according to Siemensβ 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>
For more information on this vulnerability and associated software updates, please see Siemens security notification SSA-592007 on their website:
<https://www.siemens.com/cert/advisories>
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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.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.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-4843
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-079-02
cwe.mitre.org/data/definitions/20.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/ps/13752/dl
support.industry.siemens.com/cs/ww/en/view/109474550
support.industry.siemens.com/cs/ww/en/view/109474874
support.industry.siemens.com/cs/ww/en/view/109476571
support.industry.siemens.com/cs/ww/en/view/109478459
support.industry.siemens.com/cs/ww/en/view/109478528
support.industry.siemens.com/cs/ww/en/view/109765109
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www.us-cert.gov/ics
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www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01
www.us-cert.gov/ics/recommended-practices
www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
25.6%