Comment 19 for bug 1282865

With latests suggestions:

Draft impact description #3 -

Title: Potential context confusion in Keystone middleware
Reporter: Kieran Spear (University of Melbourne)
Products: python-keystoneclient
Versions: all version up to 0.6.0

Description:
Kieran Spear from the University of Melbourne reported a vulnerability in Keystone auth_token middleware (shipped in python-keystoneclient). By doing repeated authenticated requests, with sufficient load on the target system, an authenticated user may in certain situations assume another authenticated user's complete identity and multi-tenant authorizations, potentially resulting in a privilege escalation. Note that it is related to a bad interaction between eventlet and python-memcached that may be avoided if the calling process already monkey-patches "thread" to use eventlet. Only keystone middleware setups using auth_token with memcache are vulnerable.