CVE-2021-33267 : Vulnerability Insights and Analysis
Learn about CVE-2021-33267, a critical stack buffer overflow vulnerability in D-Link DIR-809 devices triggered by crafted POST requests. Understand the impact and mitigation steps.
D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_80034d60 in /formStaticDHCP. This vulnerability is triggered via a crafted POST request.
Understanding CVE-2021-33267
This CVE identifies a stack buffer overflow vulnerability in D-Link DIR-809 devices.
What is CVE-2021-33267?
CVE-2021-33267 refers to a critical vulnerability discovered in D-Link DIR-809 devices that allows remote attackers to trigger a stack buffer overflow using a specially crafted POST request.
The Impact of CVE-2021-33267
Exploitation of this vulnerability could lead to remote code execution, unauthorized access, and potential compromise of the affected devices. Attackers could take control of the device and perform malicious actions.
Technical Details of CVE-2021-33267
This section provides specifics on the vulnerability in D-Link DIR-809 devices.
Vulnerability Description
The vulnerability exists in the function FUN_80034d60 in /formStaticDHCP due to a stack buffer overflow issue. A maliciously crafted POST request can exploit this flaw.
Affected Systems and Versions
D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a specially crafted POST request to the affected device, triggering the stack buffer overflow and potentially gaining unauthorized access.
Mitigation and Prevention
Protecting systems from CVE-2021-33267 involves immediate actions and long-term security practices.
Immediate Steps to Take
Immediately update the device firmware to the latest version provided by D-Link. Apply network security best practices and restrict access to vulnerable devices.
Long-Term Security Practices
Regularly monitor security bulletins and updates from D-Link. Implement network segmentation and access controls to minimize the attack surface.
Patching and Updates
Ensure timely installation of patches and updates released by D-Link to address the CVE-2021-33267 vulnerability.