CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
56.9%
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemensβ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
Successful exploitation of this vulnerability could cause a denial-of-service condition of the target device.
The following software from Siemens is affected:
3.2.1 NULL POINTER DEREFERENCE CWE-476
Affected devices lack proper validation of HTTP request parameters of the hosted web service. An unauthenticated remote attacker could send specially crafted packets that could cause a denial-of-service condition of the target device.
CVE-2023-28766 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 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:H).
Turek Witold from Polskie Sieci Elektroenergetyczne S.A reported this vulnerability to Siemens.
Siemens has released updates for several affected products and recommends updating to the latest versions. Siemens recommends specific countermeasures for products where updates are not, or not yet, available:
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
Worldwide regulations for critical power systems (e.g. TSOs or DSOs) usually require multi-level redundant secondary protection schemes to build resilience into power grids. It is recommended that operators check whether appropriate resilient protection measures are in place to minimize the risk of cyber incidents impacting the gridβs reliability.
Siemens recommends that operators:
In order to run the devices in a protected IT environment, it is advised to configure the environment according to Siemens operational guidelines.
Recommended security guidelines can be found at Siemensβ grid security page.
For more information, see the associated Siemens security advisory SSA-322980 in HTML and CSAF.
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-322980.json
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