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Backdoor to D-Link routers

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#1 myrti



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Posted 13 October 2013 - 10:24 AM


Reverse engeneering of the latest firmware update from d-link showed that it allows root-access to the configuration interface of (some of) their routers without authentication if you access them with the correct user-agent set in your browser. Handy, no?

The full analysis can be found here: http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/

The following D-Link devices are likely affected:
  • DIR-100
  • DI-524
  • DI-524UP
  • DI-604S
  • DI-604UP
  • DI-604+
  • TM-G5240
Additionally, several Planex routers also appear to use the same firmware:
  • BRL-04UR
  • BRL-04CW

EDIT: And for some extra fun and giggles, try reading the user-agent backwards.

Edited by myrti, 13 October 2013 - 10:35 AM.

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#2 rotor123


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Posted 13 October 2013 - 10:56 AM

I had one of the affected Routers in use previously.


I was having a weird problem with one wireless connection. It was definitely at the router end.

I wonder if it was related to that Backdoor.


I've since switched to a 802.11ac Router and USB wireless Dual Band setup and now get all the speed I'm paying for on the 5Ghz band. the 2.4Ghz band Internet speed is only in the 30Mbps area one quarter (1/4) of the Internet speed on the 5Ghz band. Probably congestion.


Thank You for posting the Warning. I may just Bin the Dlink router, rather than keep it as a spare just in case.


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