CVE-2020-21016 Explained : Impact and Mitigation

D-Link DIR-846 devices with firmware 100A35 allow remote attackers to execute arbitrary code as root via HNAP1/control/SetGuestWLanSettings.php.

Understanding CVE-2020-21016

This CVE identifies a critical vulnerability in D-Link DIR-846 devices that can be exploited by remote attackers to execute malicious code.

What is CVE-2020-21016?

The CVE-2020-21016 vulnerability allows attackers to gain root access on affected D-Link DIR-846 devices by exploiting a specific endpoint in the firmware.

The Impact of CVE-2020-21016

This vulnerability poses a severe risk as it enables attackers to execute arbitrary code with elevated privileges, potentially leading to complete compromise of the device and unauthorized access to sensitive information.

Technical Details of CVE-2020-21016

Vulnerability Description

The vulnerability exists in the firmware of D-Link DIR-846 devices, specifically in the SetGuestWLanSettings.php endpoint, allowing attackers to achieve remote code execution.

Affected Systems and Versions

Vendor: D-Link
Product: DIR-846
Firmware Version: 100A35
Status: Affected

Exploitation Mechanism

Attackers can exploit this vulnerability remotely by sending crafted requests to the vulnerable endpoint, enabling them to execute arbitrary code with root privileges.

Mitigation and Prevention

Immediate Steps to Take

Disable remote access to the device if not required
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update firmware to the latest version
Conduct security assessments and penetration testing
Educate users on safe browsing habits and security best practices

Patching and Updates

Check the vendor's security bulletin for patches and updates
Apply firmware updates promptly to mitigate the vulnerability