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But itn’t the web interface usually not accessible from WAN?

Sure, but all the adversary needs is for the user to visit a webpage that makes his/her browser contact the router (i.e. from within the LAN). If the adversary has to take into account defeating the user's password, this becomes an impractical attack. With the backdoor, however…

Might be hard to set the user-agent for a JavaScript cross-origin request though...

flash allows you to generate UPNP requests, just generate one to forward the web server port to the internet, and you have an easy solution.

Well, I have a router that has remote-WAN-access disabled[1] ....and yet, if you type that (blurred out) IP:PORT into your browser you STILL get the prompt for user/pass. And if you type it correctly, you STILL access my router!!!!! So if my router has the same kind of UserAgent:roodkcabvogasn backdoor, I'm screwed.

I really should get a new router... like...very soon.

Also, I'm a conspiracy-nut and I think a significant amount of these "bugs" happen on purpose.

1. http://i.imgur.com/W06W1oB.png

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