1

I have a Zyxel C3000A ADSL/VDSL modem (CenturyLink branding). I have searched, and it seems it is not possible to purchase this device without CenturyLink branding and firmware.

The device has the most recent firmware installed as I write this (CZD005-4.16.011.0).

I can ssh to the device without issues:

login as: admin
admin@192.168.0.1's password: <entered my password>
>

However, when I try to run the sh command to access the shell, I get prompted for a password again. I tried a username of admin and my ssh password, but all I get is:

> sh
Please input shell credential to login
Login:admin
Password: <entered my password again>
Password Incorrect! Try again.

I also tried a username of admin and the default password of the device (on the device's sticker), but that password doesn't work either.

In other words: There is an ADDITIONAL password to access the sh prompt on the C3000Z. I don't see this additional password anywhere on the device or in the configuration GUI.

I have performed a reset of the device but the additional sh password is still there.

Does anyone know what credentials to use for sh console access on the CenturyLink C3000Z device?

Bill_Stewart
  • 1,322
  • 1
  • 8
  • 14
  • 1
    "latest firmware provided by CenturyLink" Clearly you should ask CenturtyLink support about this issue. – DavidPostill May 20 '18 at 17:29
  • First problem, you purchased a CenturyLink branded modem, with CenturyLink specific firmware, instead of a retail "unlocked" or unbranded version and expect full control over the product. Honestly, they may not give you that access or password, whether you own the modem or not. The only way may be to get get the firmware image and reverse engineer it, which may or may not be possible. – acejavelin May 20 '18 at 19:08
  • I would say that it is questionable whether they can legally prevent a device owner from gaining full access to said device. – Bill_Stewart Mar 10 '21 at 22:12

1 Answers1

0

At least on the C1000A, this didn't use to be the case. It used to give shell access after sh. A firmware update sometime in the last few years might be why.

In other words, this appears to have been disabled and probably isn't accessible anymore.

Benjamin Oakes
  • 4,613
  • 5
  • 23
  • 30