CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
12.6%
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 Siemens’ ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
Successful exploitation of this vulnerability could allow an attacker to create a malicious file loaded by OPC Foundation Local Discovery Server (running as a high-privilege user).
The following software from Siemens is affected:
3.2.1 IMPROPER INPUT VALIDATION CWE-20
OPC Foundation Local Discovery Server (LDS) in affected products uses a hard-coded file path to a configuration file. This could allow a normal user to create a malicious file that is loaded by LDS (running as a high-privilege user).
CVE-2022-44725 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Michael Heinzl reported this vulnerability to Siemens.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
Siemens has identified the following specific workarounds and mitigations that users can apply to reduce the risk:
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 Siemens’ operational guidelines for Industrial Security and following the recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found here.
For further inquiries on security vulnerabilities in Siemens products and solutions, users should contact Siemens ProductCERT.
For more information, see the associated Siemens security advisory SSA-691715 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-12-146-01B–Targeted 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.
cert-portal.siemens.com/productcert/csaf/ssa-691715.json
cert-portal.siemens.com/productcert/html/ssa-691715.html
cisa.gov/ics
cisa.gov/ics
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cwe.mitre.org/data/definitions/20.html
nvd.nist.gov/vuln/detail/CVE-2022-44725
opcfoundation.org/developer-tools/samples-and-tools-unified-architecture/local-discovery-server-lds/
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www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
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