SSA-313039

Siemens Security Advisory by Siemens ProductCERT

SSA-313039: Deserialization Vulnerability in STEP 7 Safety before V19

Publication Date:	2024-07-09
Last Update:	2024-07-09
Current Version:	V1.0
CVSS v3.1 Base Score:	6.3
CVSS v4.0 Base Score:	7.0

SUMMARY

Affected applications do not properly restrict the .NET BinaryFormatter when deserializing user-controllable input. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application.

Siemens has released a new version for SIMATIC STEP 7 Safety V18 and recommends to update to the latest version.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
Totally Integrated Automation Portal (TIA Portal)	Update to V18 Update 2 or later version https://support.industry.siemens.com/cs/ww/en/view/109817218/ See further recommendations from section Workarounds and Mitigations
Totally Integrated Automation Portal (TIA Portal) V18	Update to V18 Update 2 or later version https://support.industry.siemens.com/cs/ww/en/view/109817218/ See further recommendations from section Workarounds and Mitigations
SIMATIC STEP 7 Safety V18 All versions < V18 Update 2 affected by CVE-2023-32737	Update to V18 Update 2 or later version https://support.industry.siemens.com/cs/ww/en/view/109817218/ See further 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:

Avoid uploading PLC software from untrusted devices or MMC cards

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
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

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.

Totally Integrated Automation Portal (TIA Portal) is a PC software that provides access to the complete range of Siemens digitalized automation services, from digital planning and integrated engineering to transparent operation.

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-2023-32737

This is the same issue that exists for .NET BinaryFormatter https://docs.microsoft.com/en-us/visualstudio/code-quality/ca2300.

CVSS v3.1 Base Score	6.3
CVSS v3.1 Vector	CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CVSS v4.0 Base Score	7.0
CVSS v4.0 Vector	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE	CWE-502: Deserialization of Untrusted Data

ADDITIONAL INFORMATION

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 (2024-07-09):

Publication Date

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