SSA-783481

Siemens Security Advisory by Siemens ProductCERT

SSA-783481: Denial-of-Service Vulnerability in LOGO! 8 BM

Publication Date:	2021-03-09
Last Update:	2023-12-12
Current Version:	V1.1
CVSS v3.1 Base Score:	5.5

SUMMARY

A Denial-of-Service vulnerability has been identified in LOGO! 8 BM. This vulnerability could allow an attacker to crash a device, if a user is tricked into loading a malicious project file onto an affected device.

The vulnerability is related to the hardware of the product. Siemens has released new hardware versions with the LOGO! V8.4 BM product family for several affected devices in which this vulnerability is fixed. Siemens is working on new hardware versions for the SIPLUS devices to address this issue further. See the chapter "Additional Information" below for more details.

For more information please also refer to the related product support article: https://support.industry.siemens.com/cs/ww/en/view/109826554/.

AFFECTED PRODUCTS AND SOLUTION

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

Siemens recommends limiting the possibilities to execute untrusted code if possible.

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 CLASSIFICATION

Un-/Collapse All

The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at: https://cwe.mitre.org/.

Vulnerability CVE-2020-25236

The control logic (CL) the LOGO! 8 executes could be manipulated in a way that could cause the device executing the CL to improperly handle the manipulation and crash. After successful execution of the attack, the device needs to be manually reset.

CVSS v3.1 Base Score	5.5
CVSS v3.1 Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:T/RC:C
CWE	CWE-755: Improper Handling of Exceptional Conditions

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Max Bäumler for coordinated disclosure

ADDITIONAL INFORMATION

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

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

Siemens is working on new hardware versions for the SIPLUS devices to address this issue further.

For more information please also refer to the related product support article: https://support.industry.siemens.com/cs/ww/en/view/109826554/.

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 (2021-03-09):	Publication Date
V1.1 (2023-12-12):	Added information about additional new LOGO! V8.4 BM hardware versions

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