Zero-Day Advisory

Fortinet Discovers D-Link DIR-550A/604M Routers Backdoor Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a backdoor access vulnerability in some routers shipped by the company D-Link.

D-Link manufactures a series of network routers directly competing with Linksys or Asus routers.

A malicious user can use a default telnet account to get unauthorized access to vulnerable devices.

Solutions

FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

D-Link.Wireless.N300.Backdoor.Access
Released May 10, 2018

Currently we are unaware of any vendor supplied patch or updates available for this issue.

Acknowledgement

This vulnerability was discovered by David Maciejak of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.