EUVD-2024-31862

Comprehensive Technical Analysis of EUVD-2024-31862

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-31862, classified as very critical, affects multiple D-Link NAS (Network Attached Storage) devices, specifically models DNS-320L, DNS-325, DNS-327L, and DNS-340L up to version 20240403. The issue lies within the HTTP GET Request Handler, particularly in the processing of the file /cgi-bin/nas_sharing.cgi. The manipulation of the user argument with the input messagebus leads to the exposure of hard-coded credentials.

Severity Evaluation:

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

The high base score indicates a severe vulnerability that can be exploited remotely without requiring any user interaction or privileges. The potential impact includes high confidentiality, integrity, and availability risks.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: The vulnerability can be exploited remotely over the network.
• HTTP GET Request: The attacker can send a specially crafted HTTP GET request to the vulnerable endpoint /cgi-bin/nas_sharing.cgi.

Exploitation Methods:

• Hard-Coded Credentials: By manipulating the user argument with the input messagebus, an attacker can retrieve hard-coded credentials.
• Unauthenticated Access: The attack does not require any prior authentication, making it easier to exploit.

3. Affected Systems and Software Versions

Affected Devices:

• D-Link DNS-320L (all versions up to 20240403)
• D-Link DNS-325 (all versions up to 20240403)
• D-Link DNS-327L (all versions up to 20240403)
• D-Link DNS-340L (all versions up to 20240403)

Note: These devices are no longer supported by the vendor, making them particularly vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Retire and Replace: Given that the affected devices are end-of-life (EOL), the most effective mitigation is to retire and replace them with supported models.
• Network Segmentation: Isolate the affected devices from the network to limit exposure.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the vulnerable endpoint.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits to identify and mitigate vulnerabilities in network devices.
• Patch Management: Ensure that all network devices are regularly updated and patched.
• Vendor Communication: Maintain communication with vendors to stay informed about EOL products and potential vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations and individuals using the affected D-Link NAS devices within the European Union. The exposure of hard-coded credentials can lead to unauthorized access, data breaches, and potential compliance issues under regulations such as GDPR. The public disclosure of the exploit increases the likelihood of widespread attacks, underscoring the need for immediate mitigation.

6. Technical Details for Security Professionals

Vulnerability Details:

• Affected Component: HTTP GET Request Handler
• Vulnerable File: /cgi-bin/nas_sharing.cgi
• Manipulated Argument: user with input messagebus
• Exploit Impact: Exposure of hard-coded credentials

Detection and Response:

• Log Analysis: Monitor network logs for suspicious HTTP GET requests targeting the vulnerable endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS rules to detect and alert on attempts to exploit this vulnerability.
• Incident Response: Develop an incident response plan to address potential breaches resulting from this vulnerability.

References:

• VulDB Entry
• GitHub Repository
• D-Link Security Announcement

Aliases:

• CVE-2024-3272
• GSD-2024-3272

EPSS Score: 93 (indicating a high likelihood of exploitation)

Conclusion: The vulnerability EUVD-2024-31862 represents a critical risk to organizations using the affected D-Link NAS devices. Immediate action is required to mitigate the risk, including retiring and replacing EOL devices, implementing network segmentation, and maintaining robust security practices. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect against potential data breaches and compliance issues.