CVE-2021-33268 : Security Advisory and Response
Learn about CVE-2021-33268, a stack buffer overflow vulnerability in D-Link DIR-809 devices triggered via a crafted POST request. Find out the impact, technical details, 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 sub_8003183C in /fromLogin. This vulnerability is triggered via a crafted POST request.
Understanding CVE-2021-33268
This CVE involves a stack buffer overflow vulnerability in D-Link DIR-809 devices, potentially affecting the security of these devices.
What is CVE-2021-33268?
CVE-2021-33268 is a vulnerability found in D-Link DIR-809 devices that allows attackers to trigger a stack buffer overflow by sending a specially crafted POST request.
The Impact of CVE-2021-33268
Exploitation of this vulnerability could lead to remote code execution, unauthorized access to devices, and potentially full compromise of the affected systems.
Technical Details of CVE-2021-33268
This section provides more detailed technical insights into the vulnerability.
Vulnerability Description
The vulnerability exists in the function sub_8003183C in /fromLogin in D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410.
Affected Systems and Versions
D-Link DIR-809 devices with the specified firmware version DIR-809Ax_FW1.12WWB03_20190410 are known to be affected by this vulnerability.
Exploitation Mechanism
The vulnerability is exploited through a carefully crafted POST request that triggers the stack buffer overflow, potentially leading to unauthorized access.
Mitigation and Prevention
Understanding how to mitigate and prevent the impact of CVE-2021-33268 is crucial for ensuring system security.
Immediate Steps to Take
Users are advised to update their D-Link DIR-809 devices to a secure firmware version provided by the vendor. Additionally, network segmentation and access controls can help limit the attack surface.
Long-Term Security Practices
Regularly updating firmware, monitoring for suspicious activities, and following security best practices can enhance the overall security posture of the systems.
Patching and Updates
It is important for users to apply security patches and updates released by D-Link promptly to address known vulnerabilities and improve device security.