Overview

The DNS-320 Rev. Ax with firmware 2.04b02 and older is susceptible to root access  without administrative credentials. These vulnerabilities allows an attacker to perform denail of service exploits that may cause the device to be compromised and/or unreliable.

D-Link Security Incident Reponse Policy

All public communication on this issue will be offered at http://securityadvisories.dlink.com/security/

Our security response team can be contacted for incident information or to report incidents at security@dlink.com

Any non-critical security issue, help in updating firmware, or configuration regarding this issue please contact your D-Link Customer care channel.

Reference

Author - Alberto Ortega - Link - Contact

General Disclosure

Security and performance is of the utmost importance to D-Link across all product lines. This is not just through the development process but also through regular firmware updates to comply with the current safety and quality standards. We are proactively working with the sources of these reports as well as continuing to review across the complete product line to ensure that the vulnerabilities discovered are addressed.  We will continue to update this page to include the relevant product firmware updates addressing these concerns. In the meantime, you can exercise the below cautions to avoid unwanted intrusion into your D-Link product.

Immediate Recommendations for all D-Link router customers

 

• Do not enable the Remote Management feature since this will allow malicious users to use this exploit from the internet.  Remote Management is default disabled on all D-Link Routers and is included for customer care troubleshooting if useful and the customer enables it.
• If you receive unsolicited e-mails that relates to security vulnerabilities and prompt you to action, please ignore it. When you click on links in such e-mails, it could allow unauthorised persons to access your router. Neither D-Link nor its partners and resellers will send you unsolicited messages where you are asked to click or install something.
• Make sure that your wireless network is secure.
• Do not provide your admin password to anyone. If required we suggest updating the password frequently.

Description

We encourage you to contact the author for further infomation at http://about.me/a0rtega. The author can provide furhter details.

In order to avoid miscommunication the following is taken directly from the authors report @ LINK.

By downloading the firmware file, decompiling it with with application tools binwalk, dd, firmware-mod the user was able to find methods to bypass the user credentials and get access to the devices operating system.  This would allow modification of configuration or devices applications compromising the device features.

This is considered an advanced exploit which is well documented at the author's site and will encourage the user to go to the report to read more details.

Affected Products

Model Name	HW Version	Current FW Version	New FW Version for this exploit fix
DNS-320	Ax	v. 2.04b02 and older	Firmware: v. 2.05b08

Security patch for your D-Link router

These firmware updates address the security vulnerabilities in affected D-Link routers. D-Link will update this continually and we strongly recommend all users to install the relevant updates.

As there are different hardware revisions on our products, please check this on your device before downloading the correct corresponding firmware update. The hardware revision information can usually be found on the product label on the underside of the product next to the serial number. Alternatively, they can also be found on the device web configuration.

To update the firmware please log-in to the Web-GUI interface of your device, from the menu select Maintanence -> System -> Upgrade Firmware. If you require help please contact your regional D-Link customer care website for options.