EUVD-2025-8239

Comprehensive Technical Analysis of EUVD-2025-8239

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-8239 affects the Telesquare TLR-2005KSH device running firmware version 1.1.4. It involves an unauthorized stack overflow vulnerability triggered by requesting 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:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack is relatively straightforward to execute.
• Privileges Required (PR): None (N) - No special privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• 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 can lead to denial of service or system crashes.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through network-based exploitation. An attacker can send a specially crafted HTTP request to the admin.cgi endpoint with the setUsernamePassword parameter, causing a stack overflow. This can lead to:

• Remote Code Execution (RCE): The attacker can inject malicious code to gain control over the device.
• Denial of Service (DoS): The stack overflow can crash the device, leading to service disruption.
• Data Exfiltration: The attacker can extract sensitive information, such as user credentials.

3. Affected Systems and Software Versions

The vulnerability specifically affects:

• Device: Telesquare TLR-2005KSH
• Firmware Version: 1.1.4

Other versions of the firmware may also be affected, but this has not been confirmed. It is advisable to check for updates or patches from the vendor.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following steps are recommended:

• Update Firmware: Immediately apply any available patches or updates from Telesquare.
• Network Segmentation: Isolate the affected devices from critical networks to limit potential damage.
• Access Control: Implement strict access controls to limit who can access the admin.cgi endpoint.
• Monitoring: Increase monitoring of network traffic to detect and respond to suspicious activities.
• Firewall Rules: Configure firewalls to block unauthorized access to the admin.cgi endpoint.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations using the Telesquare TLR-2005KSH device. Given the critical nature of the vulnerability, it could be exploited by malicious actors to gain unauthorized access to sensitive data, disrupt services, or launch further attacks within the network. This underscores the importance of timely patch management and robust cybersecurity practices within the EU.

6. Technical Details for Security Professionals

• Exploit Details: The vulnerability is triggered by sending a malformed request to the admin.cgi endpoint with the setUsernamePassword parameter. This causes a stack overflow, which can be exploited to execute arbitrary code.
• Detection: Security professionals can use intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for suspicious traffic targeting the admin.cgi endpoint.
• Response: In case of an attack, incident response teams should isolate the affected device, collect forensic data, and apply necessary patches.
• Prevention: Regular vulnerability assessments and penetration testing can help identify and mitigate similar vulnerabilities in the future.

Conclusion

EUVD-2025-8239 is a critical vulnerability affecting the Telesquare TLR-2005KSH device. Organizations should prioritize applying patches and implementing robust security measures to protect against potential exploitation. The European cybersecurity community should remain vigilant and proactive in addressing such vulnerabilities to maintain a secure digital environment.

References

• GitHub Repository
• NVD Entry