CVE-2018-6211 Explained : Impact and Mitigation

Devices of the brand D-Link DIR-620 with specific firmware versions are vulnerable to OS command injection due to mishandling of parameters.

Understanding CVE-2018-6211

What is CVE-2018-6211?

CVE-2018-6211 is a vulnerability affecting D-Link DIR-620 devices with certain firmware versions, making them susceptible to OS command injection.

The Impact of CVE-2018-6211

The vulnerability allows attackers to execute arbitrary commands on affected devices, potentially leading to unauthorized access, data theft, or further compromise of the device.

Technical Details of CVE-2018-6211

Vulnerability Description

The flaw arises from the incorrect processing of the res_buf parameter in the index.cgi script on devices with firmware versions 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, and 2.0.22.

Affected Systems and Versions

Devices: D-Link DIR-620
Firmware Versions: 1.0.3, 1.0.37, 1.3.1, 1.3.3, 1.3.7, 1.4.0, 2.0.22

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted requests to the affected devices, allowing them to inject and execute malicious commands.

Mitigation and Prevention

Immediate Steps to Take

Disable remote access to the device if not required
Regularly monitor network traffic for any suspicious activity
Apply security patches provided by D-Link

Long-Term Security Practices

Implement network segmentation to isolate critical devices
Conduct regular security audits and penetration testing

Patching and Updates

Keep firmware up to date with the latest releases from D-Link