EUVD-2025-8245

Comprehensive Technical Analysis of EUVD-2025-8245

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-8245 affects the Telesquare TLR-2005KSH device running firmware version 1.1.4. The issue is a stack buffer overflow vulnerability that can be triggered by sending a specially crafted request to the admin.cgi parameter with setDdns. This vulnerability allows unauthorized attackers to execute arbitrary code, potentially leading to full system compromise.

Severity Evaluation:

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

The CVSS score of 9.8 indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score reflects the ease of exploitation and the severe impact on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited over the network, making it accessible to remote attackers.
• Unauthenticated Access: No authentication is required to exploit this vulnerability, increasing the risk.

Exploitation Methods:

• Crafted HTTP Request: An attacker can send a maliciously crafted HTTP request to the admin.cgi endpoint with the setDdns parameter, causing a stack buffer overflow.
• Code Execution: The buffer overflow can lead to arbitrary code execution, allowing the attacker to take control of the device.

3. Affected Systems and Software Versions

Affected Systems:

• Telesquare TLR-2005KSH devices

Affected Software Versions:

• Firmware version 1.1.4

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate affected devices from critical networks to limit the potential impact.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the admin.cgi endpoint.
• Monitoring: Increase monitoring of network traffic to detect and respond to suspicious activities.

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware updates provided by Telesquare as soon as they are available.
• Patch Management: Implement a robust patch management process to ensure timely updates.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the Telesquare TLR-2005KSH device. The potential for unauthorized access and code execution can lead to data breaches, loss of service, and other severe security incidents. This highlights the importance of timely vulnerability disclosure and patching processes within the European cybersecurity framework.

6. Technical Details for Security Professionals

Vulnerability Details:

• Type: Stack Buffer Overflow
• Trigger: Malicious request to admin.cgi with setDdns parameter
• Impact: Arbitrary code execution, leading to full system compromise

Exploitation Steps:

1. Identify Target: Locate Telesquare TLR-2005KSH devices running firmware version 1.1.4.
2. Craft Request: Create a specially crafted HTTP request targeting the admin.cgi endpoint with the setDdns parameter.
3. Send Request: Transmit the crafted request to the target device.
4. Exploit: If successful, the stack buffer overflow will allow the execution of arbitrary code.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect unusual traffic patterns targeting the admin.cgi endpoint.
• Log Analysis: Regularly analyze logs for any suspicious activities related to the admin.cgi endpoint.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• GitHub Repository
• NVD Entry

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk and protect their systems from potential attacks.