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Stryker released software updates to mitigate a reusing a nonce vulnerability in its Secure II MedSurg Bed, S3 MedSurg Bed, and InTouch ICU Bed, according to a report from NCCIC.

Successful exploitation of this vulnerability could allow data traffic manipulation, resulting in partial disclosure of encrypted communication or injection of data. Public exploits are available.

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The following Stryker medical products suffer from the vulnerability:
• Secure II MedSurg Bed (enabled with iBed Wireless), Model: 3002
• S3 MedSurg Bed (enabled with iBed Wireless), Models: 3002 S3, and 3005 S3
• InTouch ICU Bed (enabled with Bed Wireless), Models 2131, and 2141

An industry-wide vulnerability exists in the WPA and WPA2 protocol affected by the Key Reinstallation Attacks known as KRACK. The four-way hand shake traffic in the WiFi Protected Access WPA and WPA2 protocol can be manipulated to allow nonce reuse, resulting in key reinstallation. This could allow an attacker to execute a “man-in-the-middle” attack, enabling the attacker within radio range to replay, decrypt, or spoof frames.

Cyber Security

Mathy Vanhoef of imec-DistriNet, KU Leuven discovered the KRACK vulnerabilities. Stryker reported to NCCIC that the KRACK vulnerabilities may possibly affect these products.

The following CVEs have been assigned to this group of vulnerabilities:
CVE-2017-13077: Reinstallation of the pairwise key during the four-way handshake
CVE-2017-13078: Reinstallation of the group key during the four-way handshake
CVE-2017-13079: Reinstallation of the Integrity Group Temporal Key (IGTK) during the four-way handshake
CVE-2017-13080: Reinstallation of the group key during the group key handshake
CVE-2017-13081: Reinstallation of the IGTK during the group key handshake
CVE-2017-13082: Reinstallation of the Pairwise Transient Key (PTK) Temporal Key (TK) during the fast BSS transmission (FT) handshake
CVE-2017-13086: Reinstallation of the Tunneled Direct-Link Setup (TDLS) Peer Key (TPK) during the TDLS handshake
CVE-2017-13087: Reinstallation of the Group Temporal Key (GTK) when processing a Wireless Network Management (WNM) Sleep Mode Response frame
CVE-2017-13088: Reinstallation of the IGTK when processing a WNM Sleep Mode Response frame

A CVSS v3 base score of 6.8 has been calculated.

The product sees use mainly in the healthcare and public health sectors. It also sees action on a global basis.

This vulnerability is exploitable from an adjacent network. High skill level is needed to exploit.

Stryker released software updates for affected products to mitigate the KRACK vulnerabilities.
• Gateway 1.0: No patch available
• Gateway 2.0: Upgrade to software version 5212-400-905_3.5.002.01
• Gateway 3.0: Patch incorporated in current software version 5212-500-905_4.3.001.01

Stryker recommends users take additional defensive measures to minimize the risk of exploitation. Specifically, users should:
• If determined unnecessary by the user, the iBed wireless functionality may be disabled
• Stryker recommends these products operate on a separate VLAN, where possible, to ensure proper network security segmentation
• As an extra precaution, ensure the latest recommended updates (which includes the KRACK patch) for WiFi access points, have been implemented in WiFi enabled networks

For additional questions, users can call 1-800-STRYKER, option 2 for Stryker Medical Technical Support.

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