OAuth 2.0 Threat Model and Security Considerations
draft-ietf-oauth-v2-threatmodel-02

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Last updated 2012-02-19 (latest revision 2011-10-26)
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Web Authorization Protocol (oauth)                   T. Lodderstedt, Ed.
Internet-Draft                                       Deutsche Telekom AG
Intended status: Informational                                M. McGloin
Expires: August 22, 2012                                             IBM
                                                                 P. Hunt
                                                      Oracle Corporation
                                                       February 19, 2012

           OAuth 2.0 Threat Model and Security Considerations
                   draft-ietf-oauth-v2-threatmodel-02

Abstract

   This document gives security considerations based on a comprehensive
   threat model for the OAuth 2.0 Protocol.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 22, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Lodderstedt, et al.      Expires August 22, 2012                [Page 1]
Internet-Draft             OAuth 2.0 Security              February 2012

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  6
   2.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.1.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     2.2.  Attack Assumptions . . . . . . . . . . . . . . . . . . . .  7
     2.3.  Architectural assumptions  . . . . . . . . . . . . . . . .  7
       2.3.1.  Authorization Servers  . . . . . . . . . . . . . . . .  8
       2.3.2.  Resource Server  . . . . . . . . . . . . . . . . . . .  8
       2.3.3.  Client . . . . . . . . . . . . . . . . . . . . . . . .  8
   3.  Security Features  . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  Tokens . . . . . . . . . . . . . . . . . . . . . . . . . .  9
       3.1.1.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . 10
       3.1.2.  Expires_In . . . . . . . . . . . . . . . . . . . . . . 10
     3.2.  Access Token . . . . . . . . . . . . . . . . . . . . . . . 11
     3.3.  Refresh Token  . . . . . . . . . . . . . . . . . . . . . . 11
     3.4.  Authorization Code . . . . . . . . . . . . . . . . . . . . 12
     3.5.  Redirection URI  . . . . . . . . . . . . . . . . . . . . . 12
     3.6.  State parameter  . . . . . . . . . . . . . . . . . . . . . 12
     3.7.  Client Identity  . . . . . . . . . . . . . . . . . . . . . 12
   4.  Security Threat Model  . . . . . . . . . . . . . . . . . . . . 14
     4.1.  Clients  . . . . . . . . . . . . . . . . . . . . . . . . . 15
       4.1.1.  Threat: Obtain Client Secrets  . . . . . . . . . . . . 15
       4.1.2.  Threat: Obtain Refresh Tokens  . . . . . . . . . . . . 16
       4.1.3.  Threat: Obtain Access Tokens . . . . . . . . . . . . . 18
       4.1.4.  Threat: End-user credentials phished using
               compromised or embedded browser  . . . . . . . . . . . 18
       4.1.5.  Threat: Open Redirectors on client . . . . . . . . . . 19
     4.2.  Authorization Endpoint . . . . . . . . . . . . . . . . . . 19
       4.2.1.  Threat: Password phishing by counterfeit
               authorization server . . . . . . . . . . . . . . . . . 20
       4.2.2.  Threat: User unintentionally grants too much
               access scope . . . . . . . . . . . . . . . . . . . . . 20
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