SSA-921449

Siemens Security Advisory by Siemens ProductCERT

SSA-921449: Plaintext Storage of a Password Vulnerability in LOGO! V8.3 BM Devices

Publication Date:	2024-08-13
Last Update:	2024-10-08
Current Version:	V1.2
CVSS v3.1 Base Score:	4.6
CVSS v4.0 Base Score:	5.1

SUMMARY

LOGO! V8.3 BM (incl. SIPLUS variants) devices contain a plaintext storage of a password vulnerability. This could allow an attacker with phyiscal access to an affected device to extract user-set passwords from an embedded storage IC.

Siemens has released new hardware versions with the LOGO! V8.4 BM and the SIPLUS LOGO! V8.4 BM product families for all affected devices in which the vulnerability is fixed. See the chapter "Additional Information" below for more details.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
LOGO! V8.3 BM	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 12/24RCE (6ED1052-1MD08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 12/24RCEo (6ED1052-2MD08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 230RCE (6ED1052-1FB08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 230RCEo (6ED1052-2FB08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 24CE (6ED1052-1CC08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 24CEo (6ED1052-2CC08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 24RCE (6ED1052-1HB08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
LOGO! 24RCEo (6ED1052-2HB08-0BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! V8.3 BM	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations
SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA1) All versions affected by CVE-2024-39922	Currently no fix is planned See recommendations from section Workarounds and Mitigations

WORKAROUNDS AND MITIGATIONS

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

CVE-2024-39922: Ensure the physical security of the affected devices to prevent unauthorized access (also see the operational guidelines for Industrial Security, especially: "Plant security: Physical prevention of access to critical components")

Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION

Siemens LOGO! BM (Base Module) devices are used for basic small-scale automation tasks.

SIPLUS extreme products are designed for reliable operation under extreme conditions and are based on SIMATIC, LOGO!, SITOP, SINAMICS, SIMOTION, SCALANCE or other devices. SIPLUS devices use the same firmware as the product they are based on.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2024-39922

Affected devices store user passwords in plaintext without proper protection. This could allow a physical attacker to retrieve them from the embedded storage ICs.

CVSS v3.1 Base Score	4.6
CVSS v3.1 Vector	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
CVSS v4.0 Base Score	5.1
CVSS v4.0 Vector	CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE	CWE-256: Plaintext Storage of a Password

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Erwan Cordier for reporting the vulnerability CVE-2024-39922

ADDITIONAL INFORMATION

Siemens has released new hardware versions with the LOGO! V8.4 BM and the SIPLUS LOGO! V8.4 BM product families for all affected devices in which the vulnerability is fixed:

LOGO! 12/24RCE (6ED1052-1MD08-0BA2)
LOGO! 12/24RCEo (6ED1052-2MD08-0BA2)
LOGO! 230RCE (6ED1052-1FB08-0BA2)
LOGO! 230RCEo (6ED1052-2FB08-0BA2)
LOGO! 24CE (6ED1052-1CC08-0BA2)
LOGO! 24CEo (6ED1052-2CC08-0BA2)
LOGO! 24RCE (6ED1052-1HB08-0BA2)
LOGO! 24RCEo (6ED1052-2HB08-0BA2)
SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA2)
SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA2)
SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA2)
SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA2)
SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA2)
SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA2)
SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA2)
SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA2)

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2024-08-13):	Publication Date
V1.1 (2024-09-10):	Added researcher acknowledgment and information about additional new SIPLUS LOGO! hardware versions: SIPLUS LOGO! 24CE and SIPLUS LOGO! 230RCE
V1.2 (2024-10-08):	Added information about additional new SIPLUS LOGO! hardware versions

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