CVE-2019-20216 Explained : Impact and Mitigation

D-Link DIR-859 1.05 and 1.06B01 Beta01 devices are vulnerable to remote code execution due to mishandling of REMOTE_PORT, allowing attackers to execute arbitrary OS commands.

Understanding CVE-2019-20216

This CVE involves a critical vulnerability in D-Link DIR-859 devices that can be exploited by remote attackers.

What is CVE-2019-20216?

The vulnerability in D-Link DIR-859 devices allows attackers to execute arbitrary OS commands by manipulating the urn: in the M-SEARCH method of ssdpcgi() in /htdocs/cgibin. The issue arises due to the mishandling of REMOTE_PORT, enabling unauthorized command execution.

The Impact of CVE-2019-20216

This vulnerability poses a severe risk as attackers can execute malicious commands, potentially leading to unauthorized access and system compromise.

Technical Details of CVE-2019-20216

Dive deeper into the technical aspects of this vulnerability.

Vulnerability Description

The vulnerability arises from the mishandling of REMOTE_PORT, allowing attackers to concatenate different commands using shell metacharacters via the urn: service/device.

Affected Systems and Versions

Product: D-Link DIR-859
Versions: 1.05 and 1.06B01 Beta01

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating the urn: service/device value, enabling the execution of arbitrary OS commands.

Mitigation and Prevention

Learn how to protect your systems from CVE-2019-20216.

Immediate Steps to Take

Update D-Link DIR-859 devices to the latest firmware version.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly conduct security assessments and penetration testing.
Educate users on safe browsing habits and cybersecurity best practices.

Patching and Updates

Stay informed about security advisories and patches released by D-Link.
Apply security updates promptly to mitigate the risk of exploitation.