CVE-2021-33274 : Exploit Details and Defense Strategies

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability.

Understanding CVE-2021-33274

This CVE identifies a stack buffer overflow vulnerability in D-Link DIR-809 devices, triggered by a crafted POST request.

What is CVE-2021-33274?

D-Link DIR-809 devices with specific firmware versions contain a stack buffer overflow vulnerability in the function FUN_80040af8 in /formWlanSetup.

The Impact of CVE-2021-33274

This vulnerability could be exploited by an attacker to execute arbitrary code on the affected device, potentially leading to a full system compromise.

Technical Details of CVE-2021-33274

The following technical details provide more insight into the vulnerability:

Vulnerability Description

The stack buffer overflow vulnerability exists in the function FUN_80040af8 in /formWlanSetup in D-Link DIR-809 devices.

Affected Systems and Versions

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 are affected by this vulnerability.

Exploitation Mechanism

The vulnerability is triggered via a crafted POST request, allowing an attacker to potentially execute malicious code.

Mitigation and Prevention

To secure systems from CVE-2021-33274, consider the following mitigation strategies:

Immediate Steps to Take

Update D-Link DIR-809 devices to the latest firmware version provided by the vendor.
Implement network segmentation to limit the impact of a successful exploitation.

Long-Term Security Practices

Regularly monitor vendor security bulletins for firmware updates and security advisories.
Conduct security assessments and penetration testing on IoT devices to identify vulnerabilities.

Patching and Updates

Apply patches and firmware updates promptly to mitigate the risk of exploitation.