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Impact description draft #1:

Title: Keystone DoS through V3 API authentication chaining
Reporter: Abu Shohel Ahmed (Ericsson)
Products: Keystone
Versions: 2013.2 versions up to 2013.2.3

Description:
Abu Shohel Ahmed from Ericsson reported a vulnerability in Keystone V3 API authentication. By sending a single request with the same authentication method multiple times, a remote attacker may generate unwanted load on the Keystone host, potentially resulting in a Denial of Service against a Keystone service. Only Keystone setups enabling V3 API are affected.

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https://bugs.launchpad.net/bugs/1300274

Title:
  V3 Authentication Chaining - uniqueness of auth method names

Status in OpenStack Identity (Keystone):
  Fix Released
Status in Keystone havana series:
  New
Status in OpenStack Security Advisories:
  Confirmed

Bug description:
  In V3.0 API,  we can chain authentication methods. An attacker can
  place the same authentication method multiple times in the methods
  filed. This will result in the same authentication method checking
  over and over (for loop in code).  Using this, an attacker can achieve
  some sorts of Denial of Service.   The methods field is not properly
  sanitized.

  {
     "auth":{
        "identity":{
           "methods":[
              "password",
              "password",
               "password",
               "password",
               "password" 
           ],
          "password":{
              "user":{
                 "domain":{
                    "id":"default"
                 },
                 "name":"demo",
                 "password":"stack"
              }
           }
        }
     }
  }

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