1. EXECUTIVE SUMMARY
- CVSS v3 6.8
- ATTENTION: Public exploits are available
- Vendor: Stryker
- Equipment: Secure II MedSurg Bed, S3 MedSurg Bed, and InTouch ICU Bed
- Vulnerability: Reusing a Nonce
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow data traffic manipulation, resulting in partial disclosure of encrypted communication or injection of data.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Stryker medical products are affected:
- Secure II MedSurg Bed (enabled with iBed Wireless), Model: 3002,
- S3 MedSurg Bed (enabled with iBed Wireless), Models: 3002 S3, and 3005 S3, and
- InTouch ICU Bed (enabled with Bed Wireless), Models 2131, and 2141.
3.2 VULNERABILITY OVERVIEW
3.2.1 REUSING A NONCE, KEY PAIR IN ENCRYPTION CWE-323
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 Wi-Fi 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.
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 CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).
- CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: United States
Stryker has 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
SCS 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.
- SCS 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 Wi-Fi access points, have been implemented in Wi-Fi enabled networks.