CVE-2021-33270 : What You Need to Know

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

Understanding CVE-2021-33270

This CVE identifies a stack buffer overflow vulnerability in D-Link DIR-809 devices with specific firmware versions.

What is CVE-2021-33270?

The vulnerability exists in the function FUN_800462c4 in /formAdvFirewall of D-Link DIR-809 firmware through DIR-809Ax_FW1.12WWB03_20190410. An attacker can exploit this by sending a specially crafted POST request.

The Impact of CVE-2021-33270

An attacker exploiting this vulnerability can potentially execute arbitrary code, leading to a complete compromise of the affected device. This can result in unauthorized access, data theft, or disruption of services.

Technical Details of CVE-2021-33270

This section provides insight into the specific technical aspects of the vulnerability.

Vulnerability Description

The stack buffer overflow vulnerability in D-Link DIR-809 devices allows an attacker to overflow the buffer, potentially leading to arbitrary code execution and device compromise.

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 exploited through a meticulously crafted POST request, triggering the stack buffer overflow in the device's firewall function.

Mitigation and Prevention

To address CVE-2021-33270, consider the following mitigation strategies.

Immediate Steps to Take

Implement firewall rules to restrict access to affected devices.
Regularly monitor network traffic for any suspicious activity.

Long-Term Security Practices

Keep firmware and software up to date to patch known vulnerabilities.
Conduct security assessments regularly to identify and remediate security flaws.

Patching and Updates

Check for official patches and updates from D-Link to address the stack buffer overflow vulnerability in DIR-809 devices.