2.1 Low
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
5.5 Medium
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
5.4 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
12.6%
This updated advisory is a follow-up to the advisory update titled ICSA-19-162-04 Siemens SCALANCE X (Update A) that was published January 14, 2020, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of this vulnerability could allow an attacker to reconstruct passwords for users of the affected devices, if the attacker is able to obtain a backup of the device configuration.
The following Siemens SCALANCE X products are affected by this vulnerability:
--------- Begin Update B Part 1 of 2 --------
--------- End Update B Part 1 of 2 ---------
The affected devices store passwords in a recoverable format. An attacker may extract and recover device passwords from the device configuration. Successful exploitation requires access to a device configuration backup and impacts confidentiality of the stored passwords.
CVE-2019-6567 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N).
Christopher Wade from Pen Test Partners coordinated disclosure with Siemens; Siemens reported this vulnerability to CISA. Artem Zinenko from Kaspersky reported that SIPLUS should also be mentioned.
Siemens has identified the following specific workarounds/mitigations to reduce the risk from this vulnerability:
--------- Begin Update B Part 2 of 2 ---------
--------- End Update B Part 2 of 2 ---------
Until additional updates are available, Siemens recommends users apply the following workarounds/mitigations to reduce the risk from this vulnerability:
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 users configure the environment according to Siemensβ operational guidelines for Industrial Security, and follow 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 Siemens ProductCERT.
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-646841
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. This vulnerability is not exploitable remotely.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6567
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cwe.mitre.org/data/definitions/257.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/document/109767965
support.industry.siemens.com/cs/document/109773547
support.industry.siemens.com/cs/ww/en/view/109792534/
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20SCALANCE%20X%20%28Update%20B%29+https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-04
us-cert.cisa.gov/ics
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
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-04
www.oig.dhs.gov/
www.siemens.com/cert/advisories
www.siemens.com/cert/advisories
www.siemens.com/industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-04
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mailto:?subject=Siemens%20SCALANCE%20X%20%28Update%20B%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-162-04
2.1 Low
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
5.5 Medium
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
5.4 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
12.6%