CVE-2024-1275: Welch Allyn Connex Spot Monitor Vulnerability

CVE-2024-1275 Overview

CVE-2024-1275 is a Use of Default Cryptographic Key vulnerability affecting the Baxter Welch Allyn Connex Spot Monitor, a medical device used in healthcare settings for patient vital sign monitoring. This vulnerability allows attackers to potentially manipulate device configuration and environment settings by exploiting hardcoded or default cryptographic keys embedded in the device firmware.

The use of default cryptographic keys represents a fundamental security design flaw that undermines the integrity of encrypted communications and stored data. Attackers with network access to affected devices could leverage these known keys to decrypt sensitive data, modify device configurations, or potentially inject malicious settings that could affect patient monitoring capabilities.

Critical Impact

Exploitation of this vulnerability could allow unauthorized configuration and environment manipulation of medical monitoring devices, potentially impacting patient care and healthcare operations.

Affected Products

• Baxter Welch Allyn Connex Spot Monitor - all versions prior to 1.52

Discovery Timeline

• 2024-05-31 - CVE-2024-1275 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-1275

Vulnerability Analysis

This vulnerability falls under CWE-1394 (Use of Default Cryptographic Key), which describes scenarios where products ship with default cryptographic keys that are either publicly known or easily discoverable. In the context of the Welch Allyn Connex Spot Monitor, this represents a significant security concern for healthcare environments.

Medical devices like the Connex Spot Monitor often use cryptographic keys for protecting configuration data, securing communications with hospital networks, and ensuring device integrity. When these keys are hardcoded or set to default values across all devices of the same model, an attacker who discovers the key through reverse engineering, documentation leaks, or analysis of one device can compromise all devices using the same key.

The network-based attack vector means that attackers with access to the healthcare network—whether through insider access, compromised network segments, or other network-based intrusions—could target vulnerable monitors without requiring physical access to the devices.

Root Cause

The root cause of this vulnerability is the use of default cryptographic keys within the Baxter Welch Allyn Connex Spot Monitor firmware. Rather than implementing unique, device-specific keys generated during manufacturing or initial setup, the affected versions utilize static keys that are consistent across all devices. This design decision, while potentially simplifying manufacturing and deployment, creates a single point of failure where the compromise of one key affects the security posture of all deployed devices.

Attack Vector

The vulnerability is exploitable over the network, requiring no user interaction and no prior authentication. An attacker positioned on the same network as vulnerable Connex Spot Monitor devices could leverage the default cryptographic key to:

1. Intercept and decrypt encrypted communications between the monitor and other hospital systems
2. Modify device configuration settings without authorization
3. Potentially alter environmental parameters that could affect device operation
4. Bypass security controls that rely on cryptographic verification

The attack complexity is considered high due to the need for the attacker to first obtain or derive the default cryptographic key, though once obtained, the exploitation becomes straightforward across all affected devices.

Detection Methods for CVE-2024-1275

Indicators of Compromise

• Unexpected configuration changes on Welch Allyn Connex Spot Monitor devices
• Anomalous network traffic patterns to or from monitoring devices
• Unauthorized access attempts or authentication failures in device logs
• Changes to device environmental settings without corresponding administrative actions

Detection Strategies

• Implement network monitoring to detect unusual traffic patterns involving Connex Spot Monitor devices
• Deploy intrusion detection systems (IDS) configured with rules for medical device protocol anomalies
• Enable comprehensive logging on network segments containing medical devices
• Conduct regular configuration audits comparing current device settings against known-good baselines

Monitoring Recommendations

• Establish network segmentation and monitor cross-segment traffic to isolated medical device VLANs
• Implement continuous monitoring of device configuration states for unauthorized changes
• Deploy endpoint detection and response (EDR) solutions where applicable on healthcare network infrastructure
• Review network flow data for communications patterns that deviate from expected medical device behavior

How to Mitigate CVE-2024-1275

Immediate Actions Required

• Upgrade all Baxter Welch Allyn Connex Spot Monitor devices to version 1.52 or later
• Isolate affected devices on segmented network VLANs with restricted access controls
• Implement network-level access controls limiting which systems can communicate with monitoring devices
• Audit current device configurations and document baseline settings for comparison

Patch Information

Baxter has addressed this vulnerability in Welch Allyn Connex Spot Monitor version 1.52. Organizations should consult the CISA ICS Medical Advisory for detailed remediation guidance and coordinate with Baxter support for firmware update procedures specific to their deployment environment.

Healthcare organizations should prioritize this update given the critical nature of the vulnerability and its potential impact on patient monitoring capabilities.

Workarounds

• Implement strict network segmentation to isolate Connex Spot Monitor devices from general network traffic
• Apply firewall rules to restrict network access to only authorized management systems and endpoints
• Enable network access control (NAC) policies to prevent unauthorized devices from communicating with monitors
• Monitor all network traffic to and from affected devices pending firmware updates