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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
39.1%
This updated advisory is a follow-up to the original advisory titled ICSA-22-069-12 Siemens RUGGEDCOM ROS that was published March 10, 2022, on the ICS webpage on www.cisa.gov/uscert.
Successful exploitation of this vulnerability in third-party components could cause a denial-of-service condition, act as a man-in-the-middle, allow an attacker to retrieve sensitive information, or allow an attacker to gain privileged functions.
Siemens reports this vulnerability affects the following RUGGEDCOM ROS-based devices:
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Vulnerabilities in third-party components could cause a denial-of-service condition, act as a man-in-the-middle, allow an attacker to retrieve sensitive information, or allow an attacker to gain privileged functions.
CVE-2021-37208, CVE-2021-42016, CVE-2021-42017, CVE-2021-42018, CVE-2021-42019, and CVE-2021-42020 have been assigned to these third party component vulnerabilities. A CVSS v3 base score of 7.5 has been calculated for the worst case; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
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Michael Messner from Siemens Energy reported these vulnerabilities.
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Siemens has released an update for RUGGEDCOM and recommends updating to v5.6.0 or later versions.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
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 Siemensβ operational guidelines for industrial security, and to follow 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 about this issue, please see Siemensβ security advisory SSA-256353
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 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 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.
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cert-portal.siemens.com/productcert/pdf/ssa-256353.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-22-069-12
cwe.mitre.org/data/definitions/1035.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
nvd.nist.gov/vuln/detail/CVE-2021-37208
nvd.nist.gov/vuln/detail/CVE-2021-42016
nvd.nist.gov/vuln/detail/CVE-2021-42017
nvd.nist.gov/vuln/detail/CVE-2021-42018
nvd.nist.gov/vuln/detail/CVE-2021-42019
nvd.nist.gov/vuln/detail/CVE-2021-42020
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/document/109806156
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20RUGGEDCOM%20ROS%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-22-069-12
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/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
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www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
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mailto:?subject=Siemens%20RUGGEDCOM%20ROS%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-22-069-12
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
39.1%