10 High
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
8.9 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
33.3%
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 the vulnerabilities could allow an unauthenticated attacker, who gained access to the fire protection system network, to execute arbitrary code on the affected products or create a denial-of-service (DoS) condition.
The following products of Siemens, are affected:
3.2.1 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT (‘CLASSIC BUFFER OVERFLOW’) CWE-120
The network communication library in affected systems does not validate the length of certain X.509 certificate attributes which might result in a stack-based buffer overflow. This could allow an unauthenticated remote attacker to execute code on the underlying operating system with root privileges. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; code execution might be possible on the underlying operating system with the privileges of the engineering tool user account. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; code execution might be possible on the underlying operating system with the privileges of the engineering tool user account. Successful exploitation requires an on-path attacker that intercepts the communication of the app in the fire system network; possible impact is limited to the app, not the underlying operating system.
CVE-2024-22039 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).
A CVSS v4 score has also been calculated for CVE-2024-22039. A base score of 10.0 has been calculated; the CVSS vector string is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H.
3.2.2 OUT-OF-BOUNDS READ CWE-125
The network communication library in affected systems insufficiently validates HMAC values which might result in a buffer overread. This could allow an unauthenticated remote attacker to crash the network service. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; possible impact is limited to the tool, not the underlying operating system. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; possible impact is limited to the tool, not the underlying operating system. Successful exploitation requires an on-path attacker that intercepts the communication of the app in the fire system network; possible impact is limited to the app, not the underlying operating system.
CVE-2024-22040 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
A CVSS v4 score has also been calculated for CVE-2024-22040. A base score of 8.7 has been calculated; the CVSS vector string is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N.
3.2.3 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119
The network communication library in affected systems improperly handles memory buffers when parsing X.509 certificates. This could allow an unauthenticated remote attacker to crash the network service. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; possible impact is limited to the tool, not the underlying operating system. Successful exploitation requires an on-path attacker that intercepts the communication of the engineering tool in the fire system network; possible impact is limited to the tool, not the underlying operating system. Successful exploitation requires an on-path attacker that intercepts the communication of the app in the fire system network; possible impact is limited to the app, not the underlying operating system.
CVE-2024-22041 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
A CVSS v4 score has also been calculated for CVE-2024-22041. A base score of 8.7 has been calculated; the CVSS vector string is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N.
Product-specific impact for an affected product vulnerable to the CVE:
CVE-2024-22039
CVE-2024-22040
CVE-2024-22041
Siemens reported these vulnerabilities to CISA.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce 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 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-225840 in HTML and CSAF.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
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 on cisa.gov. 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.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov 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 exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22039
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22039
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22040
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22040
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22041
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-22041
cert-portal.siemens.com/productcert/csaf/ssa-225840.json
cert-portal.siemens.com/productcert/html/ssa-225840.html
cwe.mitre.org/data/definitions/119.html
cwe.mitre.org/data/definitions/120.html
cwe.mitre.org/data/definitions/125.html
github.com/cisagov/CSAF
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
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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/resources-tools/resources/ics-recommended-practices
www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/topics/industrial-control-systems
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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www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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www.siemens.com/industrialsecurity
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mailto:?subject=Siemens%20Sinteso%20EN%20Cerberus%20PRO%20EN%20Fire%20Protection%20Systems&body=www.cisa.gov/news-events/ics-advisories/icsa-24-074-09
10 High
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
8.9 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
33.3%