CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
19.4%
This updated advisory is a follow-up to the advisory update titled ICSA-20-252-07 Siemens Industrial Products (Update E) that was published June 8, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of this vulnerability may allow an authenticated user to enable information disclosure via local access.
--------- Begin Update F Part 1 of 2 ---------
--------- End Update F Part 1 of 2 ---------
Incomplete cleanup from specific special register read operations in some Intel processors may allow an authenticated user to potentially enable information disclosure via local access.
CVE-2020-0543 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).
Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida from the VUSec group at VU Amsterdam reported this vulnerability to Intel.
Siemens recommends updating the following products to the most current BIOS version where available:
--------- Begin Update F Part 2 of 2 ---------
--------- End Update F Part 2 of 2 ---------
Siemens is preparing further updates and recommends the following specific workarounds and mitigations users can apply to reduce the risk until fixes 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 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 these vulnerabilities and the associated mitigations, please see Siemens security advisory SSA-534763
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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-12-146-01B–Targeted 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. This vulnerability is not exploitable remotely.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-0543
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cwe.mitre.org/data/definitions/200.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/cn/en/view/109763408/
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
support.industry.siemens.com/cs/ww/en/view/109763408
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Industrial%20Products%20%28Update%20F%29+https://www.cisa.gov/news-events/ics-advisories/icsa-20-252-07
us-cert.cisa.gov/
us-cert.cisa.gov/ics
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
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-20-252-07&title=Siemens%20Industrial%20Products%20%28Update%20F%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-20-252-07
www.oig.dhs.gov/
www.siemens.com/industrialsecurity
www.siemens.com/Industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-20-252-07
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20Industrial%20Products%20%28Update%20F%29&body=www.cisa.gov/news-events/ics-advisories/icsa-20-252-07
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
19.4%