Mitigation Instructions for CVE-2016- 20017

SUBJECT: CVE-2016-20017: D-Link DSL-2750B Devices Command Injection Vulnerability - Detailed Mitigation Guide

OVERVIEW:

This vulnerability template details the mitigation strategies for CVE-2016-20017, a critical vulnerability affecting D-Link DSL-2750B routers with firmware versions prior to 1.05. This vulnerability allows remote attackers to inject arbitrary commands into the device, potentially granting them full control over the router.

CVE ID: CVE-2016-20017

Published Date: October 19, 2022

Last Modified: January 8, 2024

CVSS v3 Score: 9.8 (CRITICAL)- This vulnerability allows remote attackers to potentially take complete control of the affected device. Immediate action is required to mitigate this risk.

Affected Software: D-Link DSL-2750B routers with firmware versions before 1.05

1. Tech Stack (Affected Software)

• Hardware: D-Link DSL-2750B router

• Software: D-Link firmware versions before 1.05

D-Link DSL-2750B routers with firmware versions before 1.05 are vulnerable to remote unauthenticated command injection via the login.cgi script. This vulnerability can be exploited by attackers to inject malicious commands into the router, potentially allowing them to:

• Steal sensitive information, such as usernames, passwords, and configuration data.
• Modify router settings, such as redirecting internet traffic or blocking access to specific websites.
• Launch further attacks on other devices on the network.

Successful exploitation of this vulnerability could have severe consequences, including:

• Data breaches: Attackers could steal sensitive information from the router or devices connected to the network.

• Network disruption: Attackers could modify router settings to disrupt internet access or block specific websites.

• Further attacks: Attackers could use the compromised router as a launchpad for further attacks on other devices on the network.

Here are the recommended mitigation strategies:

1. Apply the firmware update:

• The most critical mitigation strategy is to apply the firmware update released by D-Link that addresses this vulnerability. You can find the latest firmware update for your D-Link DSL-2750B router on the D-Link website

• Follow the manufacturer's instructions carefully when applying the firmware update.

2. Disable remote management:

• If you are unable to apply the firmware update immediately, you can disable remote management on your router. This will prevent attackers from exploiting the vulnerability remotely.

• Consult your router's manual or the manufacturer's website for instructions on how to disable remote management.

3. Consider replacing the router:

• If your D-Link DSL-2750B router is no longer supported by the manufacturer and no security updates are available, it is highly recommended to consider replacing it with a newer, more secure router.

• D-Link Security Advisory

• National Vulnerability Database (NVD)

• CISA Known Exploited Vulnerabilities Catalog

CONCLUSION

Applying the recommended mitigation strategies, especially installing the latest firmware update, is crucial to protect your D-Link DSL-2750B router from exploitation of CVE-2016-20017. Remember to prioritize patching critical vulnerabilities and implement additional security measures, such as strong passwords and keeping your router software up to date, to enhance your overall network security posture.