EUVD-2025-8240

Comprehensive Technical Analysis of EUVD-2025-8240

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified as EUVD-2025-8240 affects the Telesquare TLR-2005KSH device running firmware version 1.1.4. This vulnerability allows unauthorized password modification through the admin.cgi parameter with setUserNamePassword. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• AV:N (Attack Vector: Network): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low): The attack requires low complexity to exploit.
• PR:N (Privileges Required: None): No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None): No user interaction is required.
• S:U (Scope: Unchanged): The vulnerability does not change the security scope.
• C:H (Confidentiality: High): The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High): The vulnerability has a high impact on integrity.
• A:H (Availability: High): The vulnerability has a high impact on availability.

Given these metrics, the vulnerability poses a significant risk to the confidentiality, integrity, and availability of the affected systems.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending a specially crafted HTTP request to the admin.cgi endpoint with the setUserNamePassword parameter. This can be done remotely over the network, making it a highly accessible attack vector. Potential exploitation methods include:

• Automated Scripts: Attackers can use automated scripts to scan for vulnerable devices and exploit them en masse.
• Man-in-the-Middle (MitM) Attacks: Intercepting network traffic to inject malicious requests.
• Phishing: Tricking users into visiting a malicious site that sends the crafted request to the vulnerable device.

3. Affected Systems and Software Versions

The vulnerability specifically affects the Telesquare TLR-2005KSH device running firmware version 1.1.4. Other versions of the firmware and other devices from Telesquare may also be affected, but this has not been confirmed. Organizations using this device should prioritize updating their firmware to mitigate this risk.

4. Recommended Mitigation Strategies

To mitigate the risk posed by this vulnerability, the following strategies are recommended:

• Firmware Update: Immediately update the firmware to the latest version provided by Telesquare.
• Network Segmentation: Isolate the affected devices on a separate network segment to limit exposure.
• Access Controls: Implement strict access controls to limit who can access the device's management interface.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect any unauthorized access attempts.
• Firewall Rules: Implement firewall rules to block unauthorized access to the admin.cgi endpoint.

5. Impact on European Cybersecurity Landscape

The vulnerability has significant implications for the European cybersecurity landscape, particularly for organizations that rely on Telesquare devices for critical operations. The high CVSS score indicates a severe risk, which could lead to widespread exploitation if not addressed promptly. European organizations must prioritize patch management and incident response to mitigate the potential impact.

6. Technical Details for Security Professionals

Exploitation Steps:

1. Identify the target device running Telesquare TLR-2005KSH firmware version 1.1.4.
2. Craft an HTTP request to the admin.cgi endpoint with the setUserNamePassword parameter.
3. Send the request to modify the admin password without authorization.

Example Request:

POST /admin.cgi HTTP/1.1
Host: [target_ip]
Content-Type: application/x-www-form-urlencoded
Content-Length: [length]

setUserNamePassword=newpassword

Detection:

• Network Traffic Analysis: Monitor for unusual HTTP requests to the admin.cgi endpoint.
• Log Analysis: Review device logs for unauthorized access attempts and password changes.

Response:

• Incident Response: Follow established incident response procedures to contain and eradicate the threat.
• Patch Management: Ensure all devices are updated to the latest firmware version.

Prevention:

• Regular Audits: Conduct regular security audits to identify and mitigate vulnerabilities.
• User Training: Educate users on the risks of phishing and other social engineering attacks.

By addressing this vulnerability proactively, organizations can significantly reduce the risk of unauthorized access and potential data breaches.