CVE-2021-27249 : Exploit Details and Defense Strategies

This CVE-2021-27249 article provides detailed insights into a vulnerability affecting D-Link DAP-2020 v1.01rc001 Wi-Fi access points, allowing attackers to execute arbitrary code without authentication. The lack of proper validation in CGI script processing facilitates this attack.

Understanding CVE-2021-27249

This section delves into the specifics of CVE-2021-27249.

What is CVE-2021-27249?

CVE-2021-27249 is a vulnerability that enables network-adjacent attackers to run arbitrary code on D-Link DAP-2020 v1.01rc001 Wi-Fi access points without requiring authentication. The issue stems from inadequate validation of user-supplied strings during system call execution, leading to code execution as root.

The Impact of CVE-2021-27249

The impact of CVE-2021-27249 is severe, with a CVSSv3 base score of 8.8 (High). Attackers can exploit this vulnerability to execute code with high confidentiality, integrity, and availability impacts without needing any privileges.

Technical Details of CVE-2021-27249

Explore the technical aspects and implications of CVE-2021-27249.

Vulnerability Description

The vulnerability arises from the improper validation of user input within CGI scripts, enabling attackers to craft malicious payloads for code execution as root on the affected D-Link DAP-2020 v1.01rc001 access points.

Affected Systems and Versions

D-Link DAP-2020 Wi-Fi access points running version v1.01rc001 are susceptible to this exploit, exposing them to arbitrary code execution by network-adjacent threat actors.

Exploitation Mechanism

The exploitation of CVE-2021-27249 involves sending specially crafted input to the affected system, exploiting the lack of validation in CGI script processing to execute malicious commands as root.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-27249 and prevent potential attacks.

Immediate Steps to Take

Immediately update the D-Link DAP-2020 v1.01rc001 access points with the latest security patches to remediate the vulnerability and prevent unauthorized code execution.

Long-Term Security Practices

Enforce strict input validation mechanisms and security measures to mitigate future vulnerabilities and enhance the overall security posture of network-connected devices.

Patching and Updates

Regularly monitor for security updates and patches from D-Link to stay protected against emerging threats and vulnerabilities.