SSA-395348

Siemens Security Advisory by Siemens ProductCERT

SSA-395348: Improper Handling of Length Parameter Inconsistency Vulnerability in TeleControl Server Basic before V3.1.2.2

Publication Date:	2025-04-16
Last Update:	2025-04-16
Current Version:	V1.0
CVSS v3.1 Base Score:	3.7
CVSS v4.0 Base Score:	6.3

SUMMARY

TeleControl Server Basic before V3.1.2.2 contains a Improper Handling of Length Parameter Inconsistency Vulnerability that could allow an attacker to cause the application to allocate exhaustive amounts of memory and subsequently create a denial of service condition.

Siemens has released a new version for TeleControl Server Basic and recommends to update to the latest version.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
TeleControl Server Basic All versions < V3.1.2.2 affected by CVE-2025-29931	Update to V3.1.2.2 or later version https://support.industry.siemens.com/cs/ww/en/view/109987362/ 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:

CVE-2025-29931: Disable Telecontrol Server Basic redundancy, if not used

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

TeleControl Server Basic allows remote monitoring and control of plants via WAN/LAN.

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-2025-29931

The affected product does not properly validate a length field in a serialized message which it uses to determine the amount of memory to be allocated for deserialization. This could allow an unauthenticated remote attacker to cause the application to allocate exhaustive amounts of memory and subsequently create a partial denial of service condition. Successful exploitation is only possible in redundant Telecontrol Server Basic setups and only if the connection between the redundant servers has been disrupted.

CVSS v3.1 Base Score	3.7
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0 Base Score	6.3
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE	CWE-130: Improper Handling of Length Parameter Inconsistency

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Jin Huang from ADLab of Venustech for coordinated disclosure

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 (2025-04-16):

Publication Date

The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.