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Re: [Mud] [Dumpsterfire] telnet (fwd) lefty via Dumpsterfire: [Dumpsterfire] telnet

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 22 January 2020 21:01 UTC

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Subject: Re: [Mud] [Dumpsterfire] telnet (fwd) lefty via Dumpsterfire: [Dumpsterfire] telnet
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Eliot Lear <lear@cisco.com> wrote:
    > The question is this:

    > Was this an example of a service that was left running or is telnet
    > actually required for the device to be configured?

I think there are three questions.
1) Was telnet intended to be enabled in production?  I'll bet that 95% of it
   is no.  MUD would have helped significantly, provided, i guess, that the
   device was behind something that could provide ACLs. I'll bet half the
   devices are broken home routers.
   
2) Was a credential needed to access?  Old revisions of openwrt just left a
   a root shell on a telnet port, because there wasn't code space for
   anything else, and what's the point of a default credential that everyone
   knows.

3) Assuming that the service was needed in production, and either had a
   default credential or no credential, was there even a way to change
   the credential, or turn off the service?

The article says that this is a problem in telnet, and as the one comment
says, it's nothing to do with telnet.  It is a serious limitation of
passwords.
(I remember trying to figure out if I could write an S/Key calculator for an
stack calculator... not an HP, which was too limited)

    >> On 22 Jan 2020, at 02:44, Michael Richardson <mcr@sandelman.ca> wrote:
    >> 
    >> 
    >> From: lefty via Dumpsterfire <dumpsterfire@firemountain.net>
    >> Subject: [Dumpsterfire] telnet
    >> Date: 21 January 2020 at 17:40:22 CET
    >> To: dumpsterfire@firemountain.net
    >> Reply-To: lefty <leftystrat1@gmail.com>
    >> 
    >> 
    >> More than 500k telnet credentials for IoT devices leaked
    >> https://threatpost.com/hacker-leaks-more-than-500k-telnet-credentials-for-iot-devices/152015/
    >> 
    >> Meh - a small gesture
    >> 
    >> 
    >> **********************************************************************
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    > ----------------------------------------------------
    > Alternatives:

    > ----------------------------------------------------

-- 
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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