D-Link Patched Backdoor in Routers - BestCyberNews: Online News Presenter in the present world

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D-Link Patched Backdoor in Routers

D-Link has released firmware patches for a number of its routers sporting a critical authentication security bypass vulnerability discovered in October.

The update comes roughly seven weeks after researcher Craig Heffner discovered and blogged about a feature or bug built into at least eight different models of D-Link routers that could allow an attacker to log in as administrator and change the router’s settings.

Although the router models affected are fairly old, there are almost certainly plenty of these still in operation, as routers tend to be set-it-and-forget-it devices that rarely get replaced or updated unless they stop working.

D-Link saves a bit of face patching this thing, and, honestly, they've done everything they possibly can. It would be absolutely unreasonable to expect them to create invulnerable routers.
D-Link routers DIR-100, DIR-120, DI-624S, DI-524UP, DI-604S, DI-604UP, DI-604+ and TM-G5240, along with Planex routers BRL-04R, BRL-04UR and BRL-04CW also use the same firmware, Heffner said. The firmware revisions issued last Thursday are for DI-524, DI-524UP, DIR 100 and DIR-120 routers, D-Link said in its advisory.

“Various D-Link routers allow administrative web actions if the HTTP request contains a specific User-Agent string,” the company’s original advisory said. “This backdoor allows an attacker to bypass password authentication and access the router’s administrative web interface.”

Backdoors in hardware such as networking gear are generally for remote administration purposes. Researcher Travis Goodspeed told Heffner that this backdoor is used by a particular binary in the firmware enables an administrator to use this particular string to automatically reconfigure the device’s settings.

“My guess is that the developers realized that some programs/services needed to be able to change the device’s settings automatically; realizing that the web server already had all the code to change these settings, they decided to just send requests to the web server whenever they needed to change something,” Heffner wrote. “The only problem was that the web server required a username and password, which the end user could change.”

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