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Backstory: I have a Huawei HG8245 router in my house and I want to change the default username/password. I've tried following this guide but the config file always gets reset. My ISP isn't helping either so I'm looking for other ways to accomplish this. The router has telnet access so this seems like a way to change the credentials.

The first shell I gain access to looks like this:

WAP>

Pressing "?" gives me a list of available commands which I've pasted here, the two interesting ones are "su" and "shell". I can't seem to get su access, even after logging in as root (challenge password prompt, and then nothing happens), but shell gives me a proper linux shell.

WAP>shell

BusyBox v1.18.4 (2017-12-26 17:06:34 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

WAP(Dopra Linux) #

Now this is where it gets interesting, BusyBox is installed, but the help command doesn't actually work.

WAP(Dopra Linux) # help
ERROR::Command is not existed

Hitting "?" again gives me another list of available commands which I've pasted here. They are pretty limited but I have access to ls and I can see that /bin actually has a lot of classic linux stuff in it, but I can't seem to run any of it, even busybox. It just throws the cheeky "Command is not existed" error message.

My question is: How can I access these commands (preferably cat and echo)?

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  • /bin/echo hello Commented Sep 6, 2018 at 1:26
  • @RuiFRibeiro "Command is not existed" Commented Sep 6, 2018 at 1:27
  • github.com/ekawahyu/ekawahyu.github.io/blob/master/_posts/… Commented Sep 6, 2018 at 1:28
  • @slm I can't run grep, or /bin/grep even though it exists. That's the whole point of my post. Commented Sep 6, 2018 at 1:32
  • @slm I also found that link. However, I also find clues of this being a restricted shell. Working in the ISP industry, I would not be surprised if this also has added proprietary routines/backdoors added by the operator. (....) I highly doubt breaking out of this shell is on-topic here. Commented Sep 6, 2018 at 1:34

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