CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
35.0%
This updated advisory is a follow-up to the original advisory titled ICSA-19-227-03 Siemens SCALANCE Products that was published August 15, 2019, to the ICS webpage on us-cert.gov.
Successful exploitation of these vulnerabilities could lead to a denial of service or could allow an authenticated local user with physical access to the device to execute arbitrary commands on the device.
The following Siemens SCALANCE products are affected by these vulnerabilities:
An authenticated attacker with network access to Port 22/TCP of an affected device may cause a denial-of-service condition.
This security vulnerability could be exploited by an authenticated attacker with network access to the affected device. No user interaction is required to exploit this vulnerability. The vulnerability impacts the availability of the affected device.
CVE-2019-10927 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
An authenticated attacker with access to Port 22/TCP as well as physical access to an affected device may trigger the device to allow execution of arbitrary commands.
The security vulnerability could be exploited by an authenticated attacker with physical access to the affected device. No user interaction is required to exploit this vulnerability. The vulnerability impacts the confidentiality, integrity, and availability of the affected device.
CVE-2019-10928 has been assigned to this vulnerability. A CVSS v3 base score of 6.6 has been assigned; the CVSS vector string is (AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Siemens reported these vulnerabilities to CISA.
Siemens currently has an update for the following product:
--------- Begin Update A Part 1 of 1 ---------
--------- End Update A Part 1 of 1 ---------
Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce risk:
As a general security measure, Siemens strongly recommends users protect 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 following the recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: <https://www.siemens.com/cert/advisories>
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-671286 at the following location: http://www.siemens.com/cert/advisories
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 these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10927
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10928
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-227-03
cwe.mitre.org/data/definitions/710.html
cwe.mitre.org/data/definitions/710.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109769665
support.industry.siemens.com/cs/ww/en/view/109779919/
support.industry.siemens.com/cs/ww/en/view/109779919/
support.industry.siemens.com/cs/ww/en/view/109779919/
support.industry.siemens.com/cs/ww/en/view/109779919/
support.industry.siemens.com/cs/ww/en/view/109779919/
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20SCALANCE%20Products%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-19-227-03
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-19-227-03&title=Siemens%20SCALANCE%20Products%20%28Update%20A%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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-19-227-03
www.oig.dhs.gov/
www.siemens.com/cert/advisories
www.siemens.com/cert/advisories
www.siemens.com/industrialsecurity
www.us-cert.gov/ics
www.us-cert.gov/ics
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
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20SCALANCE%20Products%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-227-03
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
35.0%