EUVD-2025-35880

Comprehensive Technical Analysis of EUVD-2025-35880

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-35880 pertains to a buffer overflow in the D-Link DIR600L Ax FW116WWb01 firmware, specifically within the curTime parameter of the formSetEnableWizard function. 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 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 high confidentiality impact.
• Integrity (I): High (H) - The vulnerability allows for high integrity impact.
• Availability (A): High (H) - The vulnerability allows for high availability impact.

Given these metrics, the vulnerability is highly exploitable and can lead to severe consequences if not addressed promptly.

2. Potential Attack Vectors and Exploitation Methods

The buffer overflow vulnerability in the curTime parameter can be exploited through the following methods:

• Remote Code Execution (RCE): An attacker can send a specially crafted request to the device, causing a buffer overflow that allows for arbitrary code execution.
• Denial of Service (DoS): By sending malformed data to the curTime parameter, an attacker can crash the device, leading to a denial of service.
• Data Exfiltration: The vulnerability can be used to exfiltrate sensitive information from the device, such as configuration settings and network credentials.

3. Affected Systems and Software Versions

The vulnerability specifically affects the D-Link DIR600L Ax FW116WWb01 firmware version. It is crucial to identify all devices running this firmware version within the network to assess the extent of the risk.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to a patched version provided by D-Link. Regularly check for updates and apply them as soon as they are available.
• Network Segmentation: Isolate affected devices on a separate network segment to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the device, allowing only trusted IP addresses.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for suspicious activity that may indicate an attempt to exploit this vulnerability.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues proactively.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected D-Link devices. The potential for remote code execution and data exfiltration can lead to severe breaches, including the compromise of sensitive information and disruption of critical services. Given the widespread use of D-Link routers, the impact could be extensive if not addressed promptly.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Location: The vulnerability resides in the formSetEnableWizard function, specifically in the handling of the curTime parameter.
• Exploit Development: Crafting an exploit involves sending a malformed request to the device that exceeds the buffer size allocated for the curTime parameter. This can be achieved using tools like Metasploit or custom scripts.
• Detection: Monitor network traffic for unusual patterns, such as repeated requests to the formSetEnableWizard endpoint with oversized payloads. Implement logging and alerting mechanisms to detect and respond to such activities.
• Patch Analysis: Review the patch provided by D-Link to understand the changes made to mitigate the vulnerability. Ensure that the patch addresses the root cause of the buffer overflow.

Conclusion

The buffer overflow vulnerability in the D-Link DIR600L Ax FW116WWb01 firmware is critical and requires immediate attention. Organizations should prioritize updating affected devices and implementing robust security measures to mitigate the risk. Continuous monitoring and proactive security practices are essential to safeguard against potential exploits and maintain the integrity of the European cybersecurity landscape.