5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.7 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
42.6%
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-19-283-01 Siemens Industrial Real-Time (IRT) Devices (Update E) published on February 9, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of this vulnerability could cause a denial-of-service condition.
Siemens reports the vulnerability affects the following products and versions:
---------Begin Update F Part 1 of 1---------
---------End Update F Part 1 of 1---------
An attacker sending a specially crafted packet could break the real-time synchronization of the affected installation, which may cause a denial-of-service condition.
CVE-2019-10923 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens reported this vulnerability to CISA. Artem Zinenko of Kaspersky reported to Siemens that SIPLUS is also affected.
Siemens has provided firmware updates for the following products to fix the vulnerability:
The following updates can be obtained from a Siemens representative or via Siemensβ customer service.
Siemens is preparing further updates and recommends the following mitigations until patches are available:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to the Siemens 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 the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-349422
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.cisa.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.cisa.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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10923
www.siemens.com/cert/advisories
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/us/en/view/109756820
support.industry.siemens.com/cs/us/en/view/109756820
support.industry.siemens.com/cs/us/en/view/44029688
support.industry.siemens.com/cs/us/en/view/92522512/
support.industry.siemens.com/cs/ww/de/view/109773826
support.industry.siemens.com/cs/ww/en/ps/13752/dl
support.industry.siemens.com/cs/ww/en/view/103433117/
support.industry.siemens.com/cs/ww/en/view/109750012
support.industry.siemens.com/cs/ww/en/view/109755160
support.industry.siemens.com/cs/ww/en/view/109760397
support.industry.siemens.com/cs/ww/en/view/109762689
support.industry.siemens.com/cs/ww/en/view/109763309
support.industry.siemens.com/cs/ww/en/view/109765109
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Industrial%20Real-Time%20%28IRT%29%20Devices%20%28Update%20F%29+https://www.cisa.gov/news-events/ics-advisories/icsa-19-283-01
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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:U/C:N/I:N/A:H
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-19-283-01
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.siemens.com/industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-283-01
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www.whitehouse.gov/
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mailto:?subject=Siemens%20Industrial%20Real-Time%20%28IRT%29%20Devices%20%28Update%20F%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-283-01
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.7 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
42.6%