Re: [OAUTH-WG] I-D Action: draft-ietf-oauth-security-topics-05.txt

[Brian Campbell <[e-mail]>]

That works for me

On Wed, Mar 21, 2018 at 7:34 PM, Torsten Lodderstedt <
[e-mail]> wrote:

> Hi all,
>
> thanks for your feedback. Here is my text proposal for section 3.8.1.
>
> ——
>
> Attackers could try to utilize a user's trust in the authorization
>    server (and its URL in particular) for performing phishing attacks.
>
> RFC 6749 already prevents open redirects by stating the AS
> MUST NOT automatically redirect the user agent in case
> of an invalid combination of client_id and redirect_uri.
>
> However, as described in [I-D.ietf-oauth-closing-redirectors], an
> attacker could also utilize a correctly registered redirect URI to
> perform phishing attacks. It could for example register a client
> via dynamic client registration and intentionally send an
> erroneous authorization request, e.g. by using an invalid
> scope value, to cause the AS to automatically redirect the user
> agent to its phishing site.
>
> The AS MUST take precautions to prevent this threat.
> Based on its risk assessment the AS needs to decide whether
> it can trust the redirect URI or not and should only automatically
> redirect the user agent, if it trusts the redirect URI. If not, it could
> inform the user that it is about to redirect her to the another site
> and rely on the user to decide or just inform the user about the
> error.
>
> ——
>
> kind regards,
> Torsten.
>
>
>

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