EUVD-2025-198172

Comprehensive Technical Analysis of EUVD-2025-198172

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-198172 pertains to an authentication bypass in the Newtec Celox UHD devices (models CELOXA504 and CELOXA820) running firmware version celox-21.6.13. This vulnerability allows an attacker to gain Superuser or Operator access without providing valid credentials by injecting a forged response body during the loginWithUserName flow.

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 of 9.8 indicates a critical vulnerability. The vector breakdown shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), does not need privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Network Interception: An attacker can intercept network traffic to the /celoxservice endpoint.
2. Man-in-the-Middle (MitM) Attack: By positioning themselves between the user and the device, an attacker can modify the responses.
3. Response Injection: The attacker injects a forged response body during the loginWithUserName flow to bypass authentication.

Exploitation Methods:

1. Traffic Sniffing: Using tools like Wireshark to capture and analyze network traffic.
2. Response Modification: Employing tools such as Burp Suite to intercept and modify HTTP responses.
3. Automated Scripts: Writing scripts to automate the injection of forged responses during the authentication process.

3. Affected Systems and Software Versions

Affected Systems:

• Newtec Celox UHD models CELOXA504 and CELOXA820

Affected Software Versions:

• Firmware version celox-21.6.13

4. Recommended Mitigation Strategies

1. Firmware Update: Immediately update to a patched firmware version provided by Newtec.
2. Network Segmentation: Isolate the affected devices from the main network to limit exposure.
3. Encrypted Communication: Ensure that all communications with the device are encrypted to prevent interception and modification.
4. Access Controls: Implement strict access controls and monitoring to detect unauthorized access attempts.
5. Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using the affected Newtec Celox UHD devices, particularly in sectors such as telecommunications, broadcasting, and media. Unauthorized access to these devices can lead to data breaches, service disruptions, and potential misuse of the devices for further attacks. The high CVSS score underscores the urgency for immediate remediation to prevent widespread exploitation.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /celoxservice
• Flow: loginWithUserName
• Exploit Method: Injecting a forged response body to bypass authentication.

Detection and Response:

1. Traffic Monitoring: Implement network monitoring tools to detect unusual traffic patterns and response modifications.
2. Log Analysis: Regularly review device logs for unauthorized access attempts and successful logins.
3. Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious activities related to the /celoxservice endpoint.
4. Incident Response Plan: Develop and maintain an incident response plan specific to authentication bypass vulnerabilities.

References:

• NVD Entry
• GitHub Research
• Newtec Official Website

By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of unauthorized access and ensure the security and integrity of their systems.