CVE-2021-28143 : Security Advisory and Response

D-Link DIR-841 devices with firmware versions 3.03 and 3.04 are affected by a vulnerability that allows authenticated command injection via /jsonrpc, specifically through ping, ping6, or traceroute functionalities located under System Tools.

Understanding CVE-2021-28143

This CVE identifies a security issue in D-Link DIR-841 routers that enables authenticated users to execute commands through certain network tools.

What is CVE-2021-28143?

The CVE-2021-28143 vulnerability pertains to the ability of authenticated users to perform command injection through the /jsonrpc interface on D-Link DIR-841 devices running firmware versions 3.03 and 3.04. By exploiting this flaw using commands such as ping, ping6, or traceroute from the System Tools section, attackers can gain unauthorized access and potentially compromise the system.

The Impact of CVE-2021-28143

This security loophole can lead to serious consequences, including unauthorized execution of arbitrary commands, data exfiltration, or even complete system takeover by malicious actors. It poses a significant risk to the confidentiality, integrity, and availability of the affected devices and the data they handle.

Technical Details of CVE-2021-28143

Expanding further on the technical aspects of this vulnerability:

Vulnerability Description

The vulnerability in D-Link DIR-841 routers allows authenticated users to manipulate network commands via the /jsonrpc interface. This provides a gateway for attackers to execute unauthorized commands and potentially compromise the device.

Affected Systems and Versions

D-Link DIR-841 devices running firmware versions 3.03 and 3.04 are confirmed to be vulnerable to this security issue. Users of these specific versions should be cautious and take immediate action to mitigate the risk.

Exploitation Mechanism

By leveraging the ping, ping6, or traceroute functions accessible through System Tools on the affected routers, authenticated users can inject malicious commands into the system, paving the way for unauthorized actions.

Mitigation and Prevention

To address the CVE-2021-28143 vulnerability and enhance the security of D-Link DIR-841 devices, users and administrators should consider implementing the following measures:

Immediate Steps to Take

Update the firmware of affected devices to the latest version provided by D-Link to remediate the vulnerability.
Restrict network access to essential users and services to limit exposure to potential attackers.

Long-Term Security Practices

Regularly monitor security advisories from D-Link and apply patches promptly to safeguard against emerging threats.
Conduct security audits and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that D-Link DIR-841 routers are kept up to date with the latest firmware releases and security patches to reduce the risk of exploitation.