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). 

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1. EXECUTIVE SUMMARY

CVSS v4 7.3
ATTENTION: Low Attack Complexity
Vendor: Siemens
Equipment: Simcenter Femap
Vulnerabilities: Out-of-bounds Write, Improper Restriction of Operations within the Bounds of a Memory Buffer, Out-of-bounds Read, Access of Uninitialized Pointer

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to crash the application or execute arbitrary code if a user is tricked to open a malicious file on an affected product.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Siemens products are affected:

Simcenter Femap: Versions prior to V2401.0000 (CVE-2024-24920, CVE-2024-24921,
CVE-2024-24922, CVE-2024-24923)
Simcenter Femap: Versions prior to V2306.0001 (CVE-2024-24923)
Simcenter Femap: Versions prior to V2306.0000 (CVE-2024-24924, CVE-2024-24925)

3.2 Vulnerability Overview

3.2.1 OUT-OF-BOUNDS WRITE CWE-787

The affected application contains an out of bounds write past the end of an allocated buffer while parsing a specially crafted Catia MODEL file. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-21710)

CVE-2024-24920 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24920. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119

The affected application is vulnerable to memory corruption while parsing specially crafted Catia MODEL files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-21712)

CVE-2024-24921 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24921. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.3 OUT-OF-BOUNDS WRITE CWE-787

The affected application contains an out of bounds write past the end of an allocated buffer while parsing a specially crafted Catia MODEL file. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-21715)

CVE-2024-24922 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24922. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.4 OUT-OF-BOUNDS READ CWE-125

The affected applications contain an out of bounds read past the end of an allocated structure while parsing specially crafted Catia MODEL files. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-22055)

CVE-2024-24923 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24923. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.5 OUT-OF-BOUNDS WRITE CWE-787

The affected application contains an out of bounds write past the end of an allocated buffer while parsing a specially crafted Catia MODEL file. This could allow an attacker to execute code in the context of the current process. (ZDI-CAN-22059)

CVE-2024-24924 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24924. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.2.6 ACCESS OF UNINITIALIZED POINTER CWE-824

The affected application is vulnerable to uninitialized pointer access while parsing specially crafted Catia MODEL files. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-22060)

CVE-2024-24925 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:N/UI:R/S:U/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2024-24925. A base score of 7.3 has been assigned; the CVSS vector string is (CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
COUNTRIES/AREAS DEPLOYED: World
COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported these vulnerabilities to CISA.

4. MITIGATIONS

Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

For CVE-2024-24920, CVE-2024-24921,
CVE-2024-24922, CVE-2024-24923: Update to V2401.0000 or later version
For CVE-2024-24923: Update to V2306.0001 or later version
For CVE-2024-24924, CVE-2024-24925: Update to V2306.0000 or later version

Additionally, Siemens recommends that customers do not open untrusted Catia MODEL files from using Simcenter Femap.

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-000072 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.

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.

CISA also recommends users take the following measures to protect themselves from social engineering attacks:

Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely.

5. UPDATE HISTORY

February 15, 2024: Initial Publication