Re: [OPSAWG] [secdir] Secdir last call review of draft-ietf-opsawg-mud-tls-10

[Ben Schwartz <[e-mail]>]

Since this happened to cross my inbox, I want to reiterate that, in my
view, this document has not been properly reviewed by the TLS WG.  As the
shepherd's writeup notes, previous reviews in the TLS group raised some
significant concerns about whether this draft's approach is advisable.

I would encourage the responsible AD(s) to make sure that this document has
strong consensus support from the TLS WG before proceeding.

On Fri, Nov 18, 2022 at 12:29 PM Linda Dunbar via Datatracker <
[e-mail]> wrote:

> Reviewer: Linda Dunbar
> Review result: Has Nits
>
> I have reviewed this document as part of the security directorate's ongoing
> effort to review all IETF documents being processed by the IESG.  These
> comments were written primarily for the benefit of the security area
> directors.
> Document editors and WG chairs should treat these comments just like any
> other
> last-call comments.
>
> This document extends the Manufacturer Usage Description specification to
> incorporate the (D)TLS profile parameters for a network security service to
> identify unexpected (D)TLS usage. The document has very good description of
> common malware behavior that is informative.
>
> Questions
> - Are the profile on the remote IoT device or on the network device? If the
> profile is on remote IoT devices, are those attributes in the profiles
> attached
> as metadata when requesting TLS connections? Are those attributes
> encrypted? -
> If the Malware on IoT doesn't participate in TLS, can those MUD be used to
> detect the Malware on the remote IoT devices?
>
> - Page 6, first paragraph says:
>  "malware developers will have to develop malicious agents per IoT device
> type,
>  manufacturer and model, infect the device with the tailored malware agent
> and
>  will have keep up with updates to the device's (D)TLS profile parameters
> over
>  time."
>
> Does it mean that if all the IoT devices deployed in the network register
> their
> DeviceType/ManufacturerName/Model with the network services, then the
> network
> services can validate the TLS requests from the IoT?
>
> -  Section 3 last paragraph says that "compromised IoT devices are
> typically
> used for launching DDoS attacks". Can today's TLS re-negotiation validate
> the
> TLS requests by evaluating if the server certificates are signed by the
> same
> certifying authorities trusted by the IoT device"?
>
> Thank you very much,
>
> Linda Dunbar
>
>
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