CVE-2022-30521 Explained : Impact and Mitigation

A Stack-based Buffer Overflow vulnerability has been identified in the LAN-side Web-Configuration Interface of D-Link Wi-Fi router firmware DIR-890L DIR890LA1_FW107b09.bin and previous versions, allowing attackers to execute arbitrary code.

Understanding CVE-2022-30521

This section will cover the details of the CVE-2022-30521 vulnerability.

What is CVE-2022-30521?

The vulnerability exists in the D-Link Wi-Fi router firmware due to a stack-based buffer overflow issue in a specific function, enabling attackers to exploit it by sending a crafted payload.

The Impact of CVE-2022-30521

Attackers can exploit this vulnerability to execute arbitrary code by sending a specially crafted payload to a specific port, leading to potential unauthorized access or control of the affected device.

Technical Details of CVE-2022-30521

This section will delve into the technical aspects of the CVE-2022-30521 vulnerability.

Vulnerability Description

The flaw arises from sprintf being called without proper length checking in the HTTP header parameters, allowing user-controlled input to trigger a buffer overflow.

Affected Systems and Versions

The Stack-based Buffer Overflow vulnerability affects D-Link Wi-Fi router firmware DIR-890L DIR890LA1_FW107b09.bin and earlier versions.

Exploitation Mechanism

By exploiting the vulnerability in the LAN-side Web-Configuration Interface, attackers can send a specially crafted payload to port 49152 to trigger the buffer overflow and execute arbitrary code.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of CVE-2022-30521.

Immediate Steps to Take

Users are advised to update the D-Link Wi-Fi router firmware to the latest version promptly to patch the vulnerability and prevent potential exploitation.

Long-Term Security Practices

Implementing network segmentation, access controls, and regular security updates can help enhance the overall security posture and mitigate similar vulnerabilities in the future.

Patching and Updates

Regularly check for firmware updates from D-Link's official website and apply patches as soon as they are released to prevent security risks.