CVE-2021-33269 : Exploit Details and Defense Strategies
Learn about CVE-2021-33269, a stack buffer overflow vulnerability in D-Link DIR-809 devices. Understand the impact, technical details, and mitigation steps to secure affected systems.
D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability. This vulnerability is triggered via a crafted POST request.
Understanding CVE-2021-33269
This CVE identifies a stack buffer overflow vulnerability in D-Link DIR-809 devices that allows attackers to exploit the system through a malicious POST request.
What is CVE-2021-33269?
The CVE-2021-33269 involves a stack buffer overflow vulnerability present in D-Link DIR-809 devices, impacting their firmware through DIR-809Ax_FW1.12WWB03_20190410.
The Impact of CVE-2021-33269
This vulnerability could potentially allow threat actors to execute arbitrary code, compromise system integrity, and gain unauthorized access to the affected devices.
Technical Details of CVE-2021-33269
The technical details of CVE-2021-33269 are:
Vulnerability Description
The vulnerability exists in the function FUN_8004776c in /formVirtualServ. It is triggered by a specially crafted POST request.
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 malicious POST request to the vulnerable device, triggering the stack buffer overflow.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-33269, consider the following steps:
Immediate Steps to Take
- Update D-Link DIR-809 devices to the latest firmware version that addresses this vulnerability.
- Implement network segmentation and access controls to reduce the attack surface.
Long-Term Security Practices
- Regularly monitor vendor security bulletins and apply security patches promptly.
- Conduct security assessments and penetration testing to identify and remediate vulnerabilities.
Patching and Updates
Refer to the D-Link security bulletin for detailed information on patch availability and instructions for updating the firmware.