7.4 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
0.001 Low
EPSS
Percentile
44.9%
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 allow an unauthorized attacker in a machine-in-the-middle position to read and modify any data passed over the connection between legitimate clients and the affected device.
The following software from Siemens is affected:
3.2.1 INADEQUATE ENCRYPTION STRENGTH CWE-326
The secure shell (SSH) server on affected devices is configured to offer weak ciphers by default. This could allow an unauthorized attacker in a machine-in-the-middle position to read and modify any data passed over the connection between legitimate clients and the affected device.
CVE-2023-29054 has been assigned to this vulnerability. A CVSS v3 base score of 6.7 has been calculated; the CVSS vector string is (CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H).
Siemens reported this vulnerability to CISA.
Siemens has released updates for the affected products and recommends updating to the latest versions:
Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk identified in the vulnerability overview:
As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemensβ operational guidelines for industrial security and following recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage.
For more information, see the associated Siemens security advisory SSA-479249 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. This vulnerability is not exploitable remotely. This vulnerability has a high attack complexity.
cert-portal.siemens.com/productcert/csaf/ssa-479249.json
cert-portal.siemens.com/productcert/html/ssa-479249.html
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/326.html
nvd.nist.gov/vuln/detail/CVE-2023-29054
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
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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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