Hi Timothée,

This document is the product of the SIPCore WG, not the OAuth WG.
I suggest that you send this feedback to the SIPCore mailing list.

Regards,
 Rifaat

On Tue, Oct 15, 2024 at 8:21 AM Timothée Jaussoin <[email protected]> wrote:

> Hi,
>
> I'm currently implementing the RFC 8898 and I have a question regarding
> this specific paragraph (in
> https://www.rfc-editor.org/rfc/rfc8898#name-security-considerations):
>
> *The UAC MUST check the AS URL received in the 401/407 response against a
> list of trusted ASs configured on the UAC in order to prevent several
> classes of possible vulnerabilities when a client blindly attempts to use
> any provided AS.*
>
> Is it possible to have some precision on the kind of vulnerabilities that
> not checking the returned AS URL in the UAC could cause? This actually
> change the purpose of this RFC as it doesn't allow anymore to discover some
> new AS but more to guide the UAC to a specific AS based on its own list.
>
> Regards,
>
> Timothée Jaussoin
>
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