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).
1. EXECUTIVE SUMMARY
- CVSS v3 8.2
- ATTENTION: Low attack complexity/public exploits available
- Vendor: Siemens ProductCERT
- Equipment: RUGGEDCOM APE1808 Product Family
- Vulnerabilities: Time-of-check Time-of-use (TOCTOU) Race Condition
2. RISK EVALUATION
Exploitation of these vulnerabilities on affected products could lead to system crashing or escalation of privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following software from Siemens is affected:
- RUGGEDCOM APE1808 ADM (6GK6015-0AL20-0GL0) – vers:all/*
- RUGGEDCOM APE1808 ADM CC (6GK6015-0AL20-0GL1) – vers:all/*
- RUGGEDCOM APE1808 CKP (6GK6015-0AL20-0GK0) – vers:all/*
- RUGGEDCOM APE1808 CKP CC (6GK6015-0AL20-0GK1) – vers:all/*
- RUGGEDCOM APE1808 CLOUDCONNECT (6GK6015-0AL20-0GM0) – vers:all/*
- RUGGEDCOM APE1808 CLOUDCONNECT CC (6GK6015-0AL20-0GM1) – vers:all/*
- RUGGEDCOM APE1808 ELAN (6GK6015-0AL20-0GP0) – vers:all/*
- RUGGEDCOM APE1808 ELAN CC (6GK6015-0AL20-0GP1) – vers:all/*
- RUGGEDCOM APE1808 SAM-L (6GK6015-0AL20-0GN0) – vers:all/*
- RUGGEDCOM APE1808 SAM-L CC (6GK6015-0AL20-0GN1) – vers:all/*
- RUGGEDCOM APE1808CLA-P (6GK6015-0AL20-1AA0) – vers:all/*
- RUGGEDCOM APE1808CLA-P CC (6GK6015-0AL20-1AA1) – vers:all/*
- RUGGEDCOM APE1808CLA-S1 (6GK6015-0AL20-1AB0) – vers:all/*
- RUGGEDCOM APE1808CLA-S1 CC (6GK6015-0AL20-1AB1) – vers:all/*
- RUGGEDCOM APE1808CLA-S3 (6GK6015-0AL20-1AD0) – vers:all/*
- RUGGEDCOM APE1808CLA-S3 CC (6GK6015-0AL20-1AD1) – vers:all/*
- RUGGEDCOM APE1808CLA-S5 (6GK6015-0AL20-1AF0) – vers:all/*
- RUGGEDCOM APE1808CLA-S5 CC (6GK6015-0AL20-1AF1) – vers:all/*
- RUGGEDCOM APE1808LNX (6GK6015-0AL20-0GH0) – vers:all/*
- RUGGEDCOM APE1808LNX CC (6GK6015-0AL20-0GH1) – vers:all/*
- RUGGEDCOM APE1808W10 (6GK6015-0AL20-0GJ0) – vers:all/*
- RUGGEDCOM APE1808W10 CC (6GK6015-0AL20-0GJ1) – vers:all/*
3.2 VULNERABILITY OVERVIEW
3.2.1 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the PnpSmm shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32469 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
3.2.2 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the FwBlockServiceSmm shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32470 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
3.2.3 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the IHISI command buffer could cause TOCTOU issues, which could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32471 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
3.2.4 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the VariableRuntimeDxe shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32475 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
3.2.5 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the FvbServicesRuntimeDxe shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32477 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been assigned; the CVSS vector string is (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
3.2.6 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the SdHostDriver buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32953 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H).
3.2.7 TIME-OF-CHECK TIME-OF-USE (TOCTOU) RACE CONDITION CWE-367
DMA attacks on the SdMmcDevice buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges.
CVE-2022-32954 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H).
3.3 BACKGROUND
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and Wastewater
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Munich, Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
No fix is currently available for these vulnerabilities. Siemens recommends users follow its general security recommendations.
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends users configure 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 here.
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-957369 in HTML and CSAF.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls and isolate them from business networks.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its 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 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.
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 exploits specifically target these vulnerabilities.
