5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.9%
This updated advisory is a follow-up to the original advisory titled ICSA-22-258-03 Siemens RUGGEDCOM ROS that was published September 15, 2022, on the ICS webpage on cisa.gov/ICS.
Successful exploitation of this vulnerability could occupy all available HTTP connections and cause a denial-of-service condition.
The following versions of RUGGEDCOM ROS-based devices, typically switches and serial-to-Ethernet devices, are affected:
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Affected devices improperly handle partial HTTP requests which makes them vulnerable to slowloris attacks. This could allow a remote attacker to create a denial-of-service condition that persists until the attack ends.
CVE-2022-39158 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Siemens reported this vulnerability to CISA.
Siemens has released updates for the following products:
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Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
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As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate devices in a protected IT environment, Siemens recommends configuring the environment according to Siemensβ Operational Guidelines for Industrial Security and following recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.
For more information see Siemens Security Advisory SSA-459643 in HTML or CSAF.
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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-39158
cert-portal.siemens.com/productcert/csaf/ssa-459643.json
cert-portal.siemens.com/productcert/html/ssa-459643.html
cwe.mitre.org/data/definitions/400.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/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/109806156/
support.industry.siemens.com/cs/ww/en/view/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-22-258-03
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
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:L
www.instagram.com/cisagov
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-22-258-03
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-22-258-03
www.usa.gov/
www.whitehouse.gov/
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mailto:?subject=Siemens%20RUGGEDCOM%20ROS%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-22-258-03
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
52.9%