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[64.134.220.138]) by mx.google.com with ESMTPS id gf6sm10397395pbc.24.2013.02.28.19.21.47 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 28 Feb 2013 19:21:48 -0800 (PST) Content-Type: multipart/signed; boundary="Apple-Mail=_072EFAA3-E14E-4AE9-B852-EC14BEECF043"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 6.2 \(1499\)) From: John Bradley In-Reply-To: <512FE091.9030508@oracle.com> Date: Thu, 28 Feb 2013 19:21:45 -0800 Message-Id: <9C445AAF-BEE8-44F5-8FE6-43CA843906CC@ve7jtb.com> References: <1361830944.13340.YahooMailNeo@web31812.mail.mud.yahoo.com> <1361831644.50183.YahooMailNeo@web31801.mail.mud.yahoo.com> <1361832133.97884.YahooMailNeo@web31816.mail.mud.yahoo.com> <140EEABC-2787-4D9A-A1C5-6C973FED5BC8@adobe.com> <512FE091.9030508@oracle.com> To: prateek mishra X-Mailer: Apple Mail (2.1499) X-Gm-Message-State: ALoCoQk/uoIuUKCrzZwdQ01HwhMDHe1wgG4JAzr2aPEI7qRJ9knHWYW5r5SvE1s892ibypdJX1f4 Cc: "oauth@ietf.org" Subject: Re: [OAUTH-WG] OAuth2 attack surface.... X-BeenThere: oauth@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OAUTH WG List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Mar 2013 03:21:52 -0000 --Apple-Mail=_072EFAA3-E14E-4AE9-B852-EC14BEECF043 Content-Type: multipart/alternative; boundary="Apple-Mail=_AF284984-FE44-492D-A6BB-C321A4685BA1" --Apple-Mail=_AF284984-FE44-492D-A6BB-C321A4685BA1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 While implicit is what they are attacking, this is in principal also = possible to do with a code flow if the client is public. It is only confidential clients using the code flow that have reasonable = protection from open redirectors. In openID Connect we made registered redirect_uri and full comparison of = the URI including query parameters a requirement. Allowing path or query parameters outside of the redirect comparison = leaves too large of an uncontrolled attack surface. Implementation mistakes are almost inevitable.=20 John B. On 2013-02-28, at 2:56 PM, prateek mishra = wrote: > Characteristics of both these attacks - >=20 > 1) Use of implicit flow (access token passed on the URL) > 2) changes to redirect uri (specification does allow some flexibility = here) > 3) applications with long-lived access tokens with broad scope (in one = case only) >=20 > - prateek >> And a different one (still exploiting redirection and still = implementation mistake) = http://www.nirgoldshlager.com/2013/02/how-i-hacked-facebook-oauth-to-get-f= ull.html >>=20 >> Regards >>=20 >> Antonio >>=20 >> On Feb 25, 2013, at 11:42 PM, William Mills wrote: >>=20 >>>=20 >>>=20 >>> DOH!!! = http://homakov.blogspot.co.uk/2013/02/hacking-facebook-with-oauth2-and-chr= ome.html >>>=20 >>> From: Phil Hunt >>> To: William Mills =20 >>> Sent: Monday, February 25, 2013 2:28 PM >>> Subject: Re: [OAUTH-WG] OAuth2 attack surface.... >>>=20 >>> Whats the link? >>>=20 >>> Phil >>>=20 >>> Sent from my phone. >>>=20 >>> On 2013-02-25, at 14:22, William Mills = wrote: >>>=20 >>>> I think this is worth a read, I don't have time to dive into this = :( >>>> _______________________________________________ >>>> OAuth mailing list >>>> OAuth@ietf.org >>>> https://www.ietf.org/mailman/listinfo/oauth >>>=20 >>>=20 >>>=20 >>>=20 >>> _______________________________________________ >>> OAuth mailing list >>> OAuth@ietf.org >>> https://www.ietf.org/mailman/listinfo/oauth >>=20 >>=20 >>=20 >> _______________________________________________ >> OAuth mailing list >> OAuth@ietf.org >> https://www.ietf.org/mailman/listinfo/oauth >=20 > _______________________________________________ > OAuth mailing list > OAuth@ietf.org > https://www.ietf.org/mailman/listinfo/oauth --Apple-Mail=_AF284984-FE44-492D-A6BB-C321A4685BA1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1 While = implicit is what they are attacking, this is in principal also possible = to do with a code flow if the client is public.
It is only = confidential clients using the code flow that have reasonable protection = from open redirectors.

In openID Connect we = made registered redirect_uri and full comparison of the URI including = query parameters a requirement.

Allowing path = or query parameters outside of the redirect comparison leaves too large = of an uncontrolled attack = surface.

Implementation mistakes are almost = inevitable. 

John = B.
On 2013-02-28, at 2:56 PM, prateek mishra <prateek.mishra@oracle.com>= ; wrote:

=20 =20
Characteristics of both these attacks -

1) Use of implicit flow (access token passed on the URL)
2) changes to redirect uri (specification does allow some flexibility here)
3) applications with long-lived access tokens with broad scope (in one case only)

- prateek
And a different one (still exploiting redirection and still implementation mistake) http://www.nirgoldshlager.com/2013/02/how-i-hacked-faceb= ook-oauth-to-get-full.html

Regards

Antonio

On Feb 25, 2013, at 11:42 PM, William Mills wrote:




From: Phil Hunt <phil.hunt@oracle.com>
To: William Mills <wmills_92105@yahoo.com>
Sent: Monday, February 25, 2013 2:28 PM
Subject: Re: [OAUTH-WG] OAuth2 attack surface....

Whats the link?

Phil

Sent from my phone.

On 2013-02-25, at 14:22, William Mills <wmills_92105@yahoo.com> wrote:

I think this is worth a read, I don't have time to dive into this :(
=
_______________________________________________
OAuth mailing = list
OAuth@ietf.org
https://www.ietf.org/= mailman/listinfo/oauth




_______________________________________________
OAuth mailing list
OAuth@ietf.org
https://www.ietf.org/= mailman/listinfo/oauth



_______________________________________________
OAuth mailing list
OAuth@ietf.org
https://www.ietf.org/=
mailman/listinfo/oauth

_______________________________________________
OAuth mailing = list
OAuth@ietf.org
https://www.ietf.org/= mailman/listinfo/oauth

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