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Re: [BEHAVE] errata 4933: RFC 5766 prevent spoofed refresh requests when using short-term credentials

"Marc Blanchet" <marc.blanchet@viagenie.ca> Fri, 17 January 2020 00:25 UTC

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From: "Marc Blanchet" <marc.blanchet@viagenie.ca>
To: "Michael Richardson" <mcr+ietf@sandelman.ca>
Cc: behave@ietf.org
Date: Thu, 16 Jan 2020 19:25:32 -0500
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Subject: Re: [BEHAVE] errata 4933: RFC 5766 prevent spoofed refresh requests when using short-term credentials
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as there is a turn-related working group (tram) alive, I suggest you 
also post to the tram ml.

Marc.

On 16 Jan 2020, at 18:11, Michael Richardson wrote:

> https://www.rfc-editor.org/errata_search.php?eid=4933
>
>     4933> Section 17.3.3 says:
>
>     4933> An attacker might attempt to disrupt service to other users 
> of the
>     4933> TURN server by sending Refresh requests or CreatePermission 
> requests
>     4933> that (through source address spoofing) appear to be coming 
> from
>     4933> another user of the TURN server.  TURN prevents this by 
> requiring
>     4933> that the credentials used in CreatePermission, Refresh, and
>     4933> ChannelBind messages match those used to create the initial
>     4933> allocation.  Thus, the fake requests from the attacker will 
> be
>     4933> rejected.
>     4933> Notes:
>
>     4933> When using short-term, credentials expire after a specific 
> amount of time
>     4933> (such as 5
>     4933> minutes) and clients get new credentials. The restriction 
> imposed at section
>     4933> 17.3.3
>     4933> prevents from refreshing allocation or permission using the 
> new credentials.
>
>     4933> This RFC approves RFC 5389. So one can use short-term 
> credentials. But
>     4933> short-term credentials are useless if it can not be used to 
> refresh
>     4933> allocation or permission.
>
>     4933> The goal of 17.3.3 can be achieved by sending 438 with the 
> new nonce.
>
> a) I think we should accept this as verified.
> b) It seems that sending with the new nonce will work.  This requires 
> some
>    text changes, and we can now perhaps use the errata patcher with 
> XML.
>    I've asked for the XML (if there is any), and I'll suggest some 
> changes to
>    the text.
>
> --
> Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
>  -= IPv6 IoT consulting =-
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