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
AI Score
Confidence
High
EPSS
Percentile
38.7%
Successful exploitation of this vulnerability could allow an attacker to create a denial-of-service condition on ports 443/TCP and 4443/TCP for a duration.
The following products from Siemens are affected:
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
Affected devices do not properly restrict secure client-initiated renegotiations within the SSL and TLS protocols. This could allow an attacker to create a denial-of-service condition on ports 443/TCP and 4443/TCP for a duration.
CVE-2022-45044 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated. the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Siemens reported these vulnerabilities to CISA.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
Operators of critical power systems worldwide are usually required by regulations to build resilience into power grids by applying multi-level redundant secondary protection schemes. Therefore, Siemens recommends operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the gridβs reliability can thus be minimized by virtue of the grid design.
Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update prior to application, and supervision by trained staff of the update process in the target environment.
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.
For more information, see the associated Siemens security advisory SSA-408105 in HTML and 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 at cisa.gov/ics. Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
cert-portal.siemens.com/productcert/csaf/ssa-408105.json
cert-portal.siemens.com/productcert/html/ssa-408105.html
cisa.gov/ics
cisa.gov/ics
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cwe.mitre.org/data/definitions/400.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
nvd.nist.gov/vuln/detail/CVE-2022-45044
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us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
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