SSA-434536

Siemens Security Advisory by Siemens ProductCERT

SSA-434536: Memory Protection Bypass Vulnerability in SINUMERIK ONE and SINUMERIK MC

Publication Date:	2021-07-13
Last Update:	2021-09-14
Current Version:	V1.1
CVSS v3.1 Base Score:	8.1

SUMMARY

SINUMERIK ONE and SINUMERIK MC products are affected by a memory protection bypass vulnerability in the integrated S7-1500 CPU that could allow an attacker to write arbitrary data and code to protected memory areas or read sensitive data to launch further attacks on the CPU.

Siemens has released updates for the affected products and recommends that customers update to the new version.

AFFECTED PRODUCTS AND SOLUTION

Affected Product and Versions	Remediation
SINUMERIK MC: All versions < V6.15	Update to V6.15 or later version SINUMERIK software can be obtained from your local Siemens account manager.
SINUMERIK ONE: All versions < V6.15	Update to V6.15 or later version SINUMERIK software can be obtained from your local Siemens account manager.

WORKAROUNDS AND MITIGATIONS

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

Limit access to port 102/tcp to trusted users and systems only

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

SINUMERIK MC is a CNC system for customized machine solutions.

SINUMERIK ONE is a digital-native CNC system.

VULNERABILITY CLASSIFICATION

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-2020-15782

Affected devices are vulnerable to a memory protection bypass through a specific operation.

A remote unauthenticated attacker with network access to port 102/tcp could potentially write arbitrary data and code to protected memory areas or read sensitive data to launch further attacks.

CVSS v3.1 Base Score	8.1
CVSS Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CWE:	CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

ADDITIONAL INFORMATION

For more information regarding CVE-2020-15782 refer to the Siemens Security Advisory SSA-434534 (https://cert-portal.siemens.com/productcert/pdf/ssa-434534.pdf)

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 (2021-07-13): Publication Date

V1.1 (2021-09-14): Added solution for SINUMERIK MC and SINUMERIK ONE

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SSA-434536