EUVD-2025-18754

Comprehensive Technical Analysis of EUVD-2025-18754

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-18754 affects COROS PACE 3 devices up to version 3.0808.0. The core issue is the lack of X.509 server certificate validation during the TLS handshake process. This oversight allows an attacker to intercept and manipulate HTTPS communications, potentially leading to the theft of sensitive information such as API access tokens.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high CVSS score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV:N): Network-based attack, meaning the attacker can exploit the vulnerability remotely.
• Attack Complexity (AC:L): Low complexity, suggesting that the attack does not require specialized conditions.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is needed.
• Scope (S:U): The vulnerability affects the same security scope.
• Confidentiality (C:H), Integrity (I:H), and Availability (A:H): High impact on all three CIA triad components.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Man-in-the-Middle (MitM) Attack: An attacker can intercept the HTTPS communication between the COROS PACE 3 device and the back-end API by positioning themselves between the device and the server.
• TLS Proxy Attack: Using a TLS proxy, the attacker can present a self-signed certificate to the device, which the device will accept due to the lack of certificate validation.

Exploitation Methods:

• Eavesdropping: The attacker can monitor the communication to capture sensitive data, such as API access tokens.
• Data Manipulation: The attacker can modify the data being transmitted, potentially injecting malicious firmware updates or altering the communication to disrupt device functionality.

3. Affected Systems and Software Versions

Affected Systems:

• COROS PACE 3 devices

Software Versions:

• All versions up to and including 3.0808.0

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Users should immediately update their COROS PACE 3 devices to the latest firmware version that includes a fix for this vulnerability.
• Network Security: Implement robust network security measures, such as using VPNs and secure Wi-Fi networks, to reduce the risk of MitM attacks.

Long-Term Mitigation:

• Certificate Validation: Ensure that all future firmware updates include proper X.509 certificate validation during the TLS handshake process.
• Regular Security Audits: Conduct regular security audits and penetration testing to identify and address similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability in COROS PACE 3 devices highlights the broader issue of inadequate security measures in IoT devices, which are increasingly prevalent in European households and businesses. This incident underscores the need for:

• Stronger Security Standards: Enforcing stricter security standards for IoT devices to ensure they are not easily compromised.
• User Awareness: Educating users about the importance of keeping their devices updated and using secure networks.
• Regulatory Oversight: Increasing regulatory oversight to ensure manufacturers prioritize security in their product development cycles.

6. Technical Details for Security Professionals

Technical Overview:

• TLS Handshake Process: The TLS handshake involves the exchange of certificates to establish a secure connection. The COROS PACE 3 device fails to validate the server's X.509 certificate, allowing an attacker to present a self-signed certificate.
• HTTPS Communication: The device communicates with the back-end API over HTTPS to request firmware information. This communication can be intercepted and manipulated due to the lack of certificate validation.

Detection and Response:

• Monitoring: Implement network monitoring tools to detect unusual traffic patterns that may indicate a MitM attack.
• Incident Response: Develop an incident response plan that includes steps for identifying compromised devices, isolating them from the network, and applying necessary patches.

References:

• COROS PACE 3 Release Notes
• SYSS Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations and individuals can mitigate the risks associated with this critical flaw in COROS PACE 3 devices.