CVE-2023-43239 : Exploit Details and Defense Strategies

Understanding CVE-2023-43239

D-Link DIR-816 A2 v1.10CNB05 was discovered to contain a stack overflow via parameter flag_5G in showMACfilterMAC.

What is CVE-2023-43239?

CVE-2023-43239 is a vulnerability found in D-Link DIR-816 A2 v1.10CNB05 that allows attackers to trigger a stack overflow through the parameter flag_5G in the showMACfilterMAC function.

The Impact of CVE-2023-43239

This vulnerability can be exploited by malicious actors to execute arbitrary code or crash the system, leading to potential denial of service (DoS) attacks.

Technical Details of CVE-2023-43239

The technical details of CVE-2023-43239 are as follows:

Vulnerability Description

The vulnerability arises due to improper input validation in the specific parameter, enabling a stack overflow condition.

Affected Systems and Versions

The affected system is the D-Link DIR-816 A2 v1.10CNB05 router running the mentioned firmware version.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted requests containing malicious input to the vulnerable parameter, triggering the stack overflow.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-43239, follow these steps:

Immediate Steps to Take

Disable remote access to the router if not required.
Implement network segmentation to limit access to vulnerable devices.

Long-Term Security Practices

Regularly update the firmware of the D-Link DIR-816 A2 router.
Monitor network traffic for any suspicious activity.

Patching and Updates

Stay informed about security advisories from D-Link and apply patches promptly to address known vulnerabilities.