CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
EPSS
Percentile
61.3%
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 a malicious cyber actor to execute arbitrary code on the target system or cause a denial-of-service condition.
The following Siemens software is affected:
3.2.1 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT (‘CLASSIC BUFFER OVERFLOW’) CWE-120
Cache validation service in COMOS is vulnerable to structured exception handler (SEH)-based buffer overflow. This could allow a malicious cyber actor to execute arbitrary code on the target system or cause a denial-of-service condition.
CVE-2023-24482 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been calculated. The CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).
Siemens reported this vulnerability to CISA.
Siemens has released updates for the affected products and recommends users update to the latest versions:
Siemens has identified the following workarounds and mitigations users can apply to mitigate risk:
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 Siemens’ operational guidelines for Industrial Security, and to follow the recommendations in the product manuals. Additional information on industrial security by Siemens can be found on the Siemens Industrial Security webpage.
For further inquiries on security vulnerabilities in Siemens products and solutions, users should contact the Siemens ProductCERT.
For more information, see the associated Siemens security advisory SSA-693110 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.
cert-portal.siemens.com/productcert/csaf/ssa-693110.json
cert-portal.siemens.com/productcert/html/ssa-693110.html
cisa.gov/ics
cisa.gov/ics
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-23-047-10
cwe.mitre.org/data/definitions/120.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
nvd.nist.gov/vuln/detail/CVE-2023-24482
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
support.industry.siemens.com/cs/ww/en/view/109815702/
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us-cert.cisa.gov/ics/Recommended-Practices
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
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
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