EUVD-2025-8243

Comprehensive Technical Analysis of EUVD-2025-8243

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The Telesquare TLR-2005KSH version 1.1.4 contains an unauthorized stack overflow vulnerability in the login interface when requesting systemtil.cgi. This vulnerability allows an attacker to execute arbitrary code or cause a denial of service (DoS) by sending a specially crafted request to the affected system.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.8, which is classified as critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability allows for unauthorized access to sensitive information.
• Integrity (I): High (H) - The vulnerability allows for unauthorized modification of data.
• Availability (A): High (H) - The vulnerability allows for disruption of service.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Code Execution (RCE): An attacker can send a specially crafted request to the systemtil.cgi endpoint, causing a stack overflow and allowing for arbitrary code execution.
• Denial of Service (DoS): An attacker can send a malformed request to crash the service, leading to a denial of service.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can use tools like curl, wget, or custom scripts to send malicious HTTP requests to the vulnerable endpoint.
• Automated Exploitation: Attackers may use automated tools or scripts to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

• Telesquare TLR-2005KSH version 1.1.4

Software Versions:

• The vulnerability specifically affects version 1.1.4 of the Telesquare TLR-2005KSH device.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Apply the latest firmware update from Telesquare to mitigate the vulnerability.
• Network Segmentation: Isolate the affected devices from the public internet and restrict access to trusted networks only.
• Firewall Rules: Implement firewall rules to block unauthorized access to the systemtil.cgi endpoint.

Long-Term Mitigation:

• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar vulnerabilities.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity and potential exploitation attempts.
• User Education: Educate users on the importance of keeping devices updated and the risks associated with unpatched vulnerabilities.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Critical Infrastructure: If the Telesquare TLR-2005KSH devices are used in critical infrastructure, the vulnerability poses a significant risk to operational continuity and data integrity.
• Data Breaches: The vulnerability can lead to data breaches, compromising sensitive information and intellectual property.
• Regulatory Compliance: Organizations may face regulatory penalties and legal consequences if they fail to address the vulnerability promptly.

Regulatory and Compliance Considerations:

• GDPR: Organizations must ensure that they comply with GDPR regulations by protecting personal data and reporting breaches within the required timeframe.
• NIS Directive: Critical infrastructure operators must adhere to the Network and Information Systems (NIS) Directive to maintain security and resilience.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2025-26007
• Vulnerable Component: systemtil.cgi
• Exploitation Steps:
  1. Identify the vulnerable device using network scanning tools.
  2. Craft a malicious HTTP request targeting the systemtil.cgi endpoint.
  3. Send the request to trigger the stack overflow and execute arbitrary code or cause a DoS.

Detection and Monitoring:

• Log Analysis: Monitor logs for unusual activity related to the systemtil.cgi endpoint.
• Anomaly Detection: Use anomaly detection tools to identify deviations from normal behavior.
• Honeypots: Deploy honeypots to detect and analyze exploitation attempts.

Incident Response:

• Containment: Isolate affected devices and contain the incident to prevent further spread.
• Eradication: Remove malicious code and restore affected systems to a known good state.
• Recovery: Apply patches and updates, and restore normal operations.
• Post-Incident Analysis: Conduct a thorough analysis to understand the root cause and improve defenses.

References:

• GitHub Repository
• NVD Entry

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2025-8243 and enhance their overall cybersecurity posture.