EUVD-2023-41665

Comprehensive Technical Analysis of EUVD-2023-41665

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-41665 pertains to a stack overflow in the D-Link DIR-619L v2.04(TW) firmware. This vulnerability is triggered via the curTime parameter in the /goform/formLogin endpoint. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring 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:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
• Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect other security scopes.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

This high score underscores the critical nature of the vulnerability, which can lead to severe consequences if exploited.

2. Potential Attack Vectors and Exploitation Methods

The stack overflow vulnerability can be exploited by sending a specially crafted request to the /goform/formLogin endpoint with a malicious curTime parameter. This can result in arbitrary code execution, allowing an attacker to:

• Execute Remote Code: Gain control over the device and execute arbitrary commands.
• Compromise Data: Access sensitive information stored on the device.
• Disrupt Services: Cause denial of service (DoS) by crashing the device.

Attackers can leverage this vulnerability to infiltrate networks, exfiltrate data, and potentially pivot to other devices within the network.

3. Affected Systems and Software Versions

The vulnerability specifically affects the D-Link DIR-619L router running firmware version 2.04(TW). It is crucial to note that other versions of the firmware or similar models may also be affected if they share the same codebase. Organizations and individuals using this specific model and firmware version are at risk.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to the latest version provided by D-Link. Ensure that the update process is secure and verified.
• Network Segmentation: Isolate the affected device from critical network segments to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the device, especially from external networks.
• Monitoring and Logging: Enable comprehensive logging and monitoring to detect any suspicious activities targeting the device.
• Intrusion Detection Systems (IDS): Deploy IDS to identify and respond to potential exploitation attempts.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals relying on D-Link DIR-619L routers. The potential for remote code execution and data compromise can lead to widespread security breaches, affecting both private and public sectors. The high CVSS score indicates that this vulnerability should be a top priority for cybersecurity teams across Europe.

6. Technical Details for Security Professionals

For security professionals, the following technical details are essential:

• Vulnerability Type: Stack overflow.
• Affected Parameter: curTime in the /goform/formLogin endpoint.
• Exploitation Method: Crafted HTTP request with a malicious curTime value.
• References:
  • D-Link Security Bulletin: D-Link Security Bulletin
  • GitHub Repository: GitHub Repository

Security professionals should review the provided references for detailed information on the vulnerability and potential exploitation methods. Implementing robust security measures and staying updated with the latest patches and advisories is crucial for maintaining a secure environment.

Conclusion

EUVD-2023-41665 represents a critical vulnerability in the D-Link DIR-619L router that requires immediate attention. Organizations should prioritize updating their firmware and implementing additional security measures to mitigate the risk. The European cybersecurity community must remain vigilant and proactive in addressing such vulnerabilities to protect against potential cyber threats.