EUVD-2023-36105

Comprehensive Technical Analysis of EUVD-2023-36105

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-36105 affects D-Link DIR-300 firmware versions REVA1.06 and REVB2.06. It is classified as a File Inclusion vulnerability, specifically targeting the /model/__lang_msg.php endpoint. 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 and resources.
• Privileges Required (PR): None (N) - No special privileges are needed 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 services.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is through network-based exploitation. An attacker can exploit the File Inclusion vulnerability by manipulating the /model/__lang_msg.php endpoint to include and execute arbitrary files on the affected device. This can lead to:

• Remote Code Execution (RCE): An attacker can execute arbitrary code on the device, potentially leading to full system compromise.
• Data Exfiltration: Sensitive information can be accessed and exfiltrated.
• Service Disruption: The device's functionality can be disrupted, leading to denial of service (DoS).

3. Affected Systems and Software Versions

The vulnerability affects the following D-Link DIR-300 firmware versions:

• REVA1.06
• REVB2.06

Users with these firmware versions are at risk and should take immediate action to mitigate the vulnerability.

4. Recommended Mitigation Strategies

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

• Firmware Update: Immediately update the firmware to a version that addresses this vulnerability. Check the D-Link security bulletin for the latest firmware updates.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable endpoint.
• Monitoring: Increase monitoring of network traffic to detect any suspicious activity targeting the /model/__lang_msg.php endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on any attempts to exploit this vulnerability.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected D-Link DIR-300 devices. Given the critical nature of the vulnerability, widespread exploitation could lead to:

• Data Breaches: Sensitive information could be compromised, leading to data breaches and potential legal repercussions under GDPR.
• Service Disruptions: Critical services relying on these devices could be disrupted, affecting business operations.
• Reputation Damage: Organizations experiencing breaches due to this vulnerability could face reputational damage.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Exploitation Method: The vulnerability can be exploited by crafting a malicious HTTP request targeting the /model/__lang_msg.php endpoint. This request can include a reference to a remote or local file, leading to arbitrary file inclusion.
• Detection: Monitor network traffic for unusual requests to the /model/__lang_msg.php endpoint. Look for patterns indicative of file inclusion attempts, such as URL parameters referencing external files.
• Response: In case of detection, isolate the affected device immediately and perform a thorough investigation to determine the extent of the compromise. Apply the latest firmware updates and review network configurations to prevent future exploitation.

Conclusion

EUVD-2023-36105 is a critical vulnerability affecting D-Link DIR-300 devices. Organizations and individuals using these devices should prioritize updating their firmware and implementing robust security measures to mitigate the risk. The potential impact on European cybersecurity underscores the importance of timely and effective response to this vulnerability.

References

• D-Link Security Bulletin
• GitHub Gist

Aliases

• CVE-2023-31814
• GSD-2023-31814