• Scenario 1 and Scenario 3: Use TLS based communication
• Scenario 1 and Scenario 3: Use VLAN based segregation of clients (802.1q)
• Scenario 3: Use Wi-Fi Management Frame Protection (802.11w)
• Scenario 3: Recommendation for upper layers: Do not allow associations to use MAC addresses that are duplicates used by internal services on the LAN

Please follow the 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

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/.

There are 3 different scenarios for the listed vulnerability:
Scenario 1 "Leak frames from the Wi-Fi queue": Only the SCALANCE W700 IEEE 802.11n family is vulnerable to this scenario.
Scenario 2 "Abuse the queue for network disruptions": All listed products are vulnerable to this scenario.
Scenario 3 "Override client’s security context": All listed products are vulnerable to this scenario. However this is not a WiFi problem and it should be handled by the application layer.

For more information regarding the listed vulnerability and its scenarios see the original published paper (https://papers.mathyvanhoef.com/usenix2023-wifi.pdf).

https://www.siemens.com/cert/advisories