CVE-2024-5176: Welch Allyn Configuration Tool Vulnerability

CVE-2024-5176 Overview

CVE-2024-5176 is an Insufficiently Protected Credentials vulnerability (CWE-522) affecting the Baxter Welch Allyn Configuration Tool. This vulnerability allows attackers to potentially access remote services using stolen credentials due to inadequate protection of sensitive authentication data. The flaw exists in the way the Configuration Tool handles and stores credential information, making it susceptible to credential theft and subsequent unauthorized access to connected medical device systems.

Critical Impact

This vulnerability in medical device configuration software could allow attackers to gain unauthorized access to healthcare systems using stolen credentials, potentially compromising patient data integrity and medical device operations.

Affected Products

• Baxter Welch Allyn Configuration Tool version 1.9.4.1
• Baxter Welch Allyn Configuration Tool versions prior to 1.9.4.1

Discovery Timeline

• 2024-05-31 - CVE-2024-5176 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-5176

Vulnerability Analysis

This vulnerability stems from CWE-522 (Insufficiently Protected Credentials), where the Baxter Welch Allyn Configuration Tool fails to adequately protect sensitive credential information. The Configuration Tool is used to manage and configure Welch Allyn medical devices, making this a particularly sensitive vulnerability in healthcare environments.

The vulnerability is network-accessible, meaning an attacker does not need physical access to exploit it. However, some user interaction is required for successful exploitation. The potential impact is severe, affecting the confidentiality and integrity of both the vulnerable system and connected systems. This is especially concerning in healthcare environments where the Configuration Tool may have access to multiple medical devices and patient data systems.

Root Cause

The root cause of CVE-2024-5176 lies in the insufficient protection mechanisms applied to credentials within the Welch Allyn Configuration Tool. The application fails to implement adequate security controls for storing, transmitting, or handling authentication credentials. This could manifest in several ways including credentials stored in plaintext or with weak encryption, credentials transmitted without proper encryption, or credentials accessible through inadequate access controls within the application.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation. An attacker who successfully obtains credentials from the Configuration Tool can use them to authenticate to remote services. The exploitation scenario typically involves:

1. The attacker identifies a system running the vulnerable Welch Allyn Configuration Tool
2. The attacker exploits the credential protection weakness to extract stored credentials
3. Using the stolen credentials, the attacker gains unauthorized access to configured medical devices or backend services
4. This access can be leveraged for data exfiltration, configuration manipulation, or as a pivot point for further network intrusion

The vulnerability requires some form of user interaction, suggesting that social engineering or phishing tactics may be involved in the attack chain.

Detection Methods for CVE-2024-5176

Indicators of Compromise

• Unexpected authentication attempts to medical device management systems from unauthorized sources
• Anomalous login patterns for accounts associated with the Welch Allyn Configuration Tool
• Evidence of credential extraction or unauthorized file access on systems running the Configuration Tool
• Unusual network connections originating from or targeting Configuration Tool installations

Detection Strategies

• Monitor authentication logs for the Welch Allyn Configuration Tool and connected services for suspicious login attempts
• Implement file integrity monitoring on systems running the Configuration Tool to detect unauthorized access to credential stores
• Deploy network monitoring to identify unusual traffic patterns between the Configuration Tool and medical devices
• Use behavioral analytics to detect abnormal access patterns for service accounts associated with the Configuration Tool

Monitoring Recommendations

• Enable comprehensive logging for all authentication events within the Welch Allyn Configuration Tool environment
• Implement SIEM rules to alert on multiple failed authentication attempts followed by successful logins
• Monitor for credential dumping tools or techniques targeting the Configuration Tool installation directories
• Track network connections to and from systems running the vulnerable software versions

How to Mitigate CVE-2024-5176

Immediate Actions Required

• Identify all instances of Baxter Welch Allyn Configuration Tool version 1.9.4.1 and prior in your environment
• Restrict network access to systems running the vulnerable Configuration Tool using network segmentation
• Rotate credentials for all accounts configured within or managed by the Configuration Tool
• Monitor for unauthorized access attempts using stolen credentials until patches can be applied

Patch Information

Organizations should consult the CISA ICS Medical Advisory for detailed remediation guidance from Baxter. Contact Baxter directly for information on updated versions that address this vulnerability. Given the critical nature of this vulnerability in healthcare environments, prioritize patch deployment according to your organization's medical device security policies.

Workarounds

• Implement network segmentation to isolate systems running the Configuration Tool from untrusted networks
• Apply the principle of least privilege to accounts used by the Configuration Tool
• Use multi-factor authentication where supported for accessing Configuration Tool functionality
• Implement additional monitoring and logging for all credential-related activities within the Configuration Tool environment
• Consider disabling or restricting remote access to the Configuration Tool until patches are available

# Network isolation example for Configuration Tool systems
# Restrict access to Configuration Tool hosts to authorized management networks only
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP