[OSSA-2016-008] Incorrect Audit IDs in Keystone Fernet Tokens can result in revocation bypass (CVE-2016-4911)

[morgan fainberg <morgan.fainberg () gmail com>]

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OSSA-2016-008: Incorrect Audit IDs in Keystone Fernet Tokens can result in revocation bypass
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:Date: May 23, 2016
:CVE: CVE-2016-4911


Affects
~~~~~~~
- Keystone: ==9.0.0


Description
~~~~~~~~~~~
Lance Bragstad (Rackspace) reported a vulnerability in the Keystone
Fernet Token Provider. By rescoping a token a user will receive a new
token without correct audit_ids, these incorrect audit_ids will
prevent the entire chain of tokens from being revoked properly. This
vulnerability does not impact revoking a token by its individual
audit_id. Only deployments with Keystone configured to use Fernet
tokens are impacted.


Patches
~~~~~~~
- https://review.openstack.org/#/c/312582/ (Mitaka)
- https://review.openstack.org/#/c/311886/ (Newton)


Credits
~~~~~~~
- Lance Bragstad from Rackspace (CVE-2016-4911)


References
~~~~~~~~~~
- https://bugs.launchpad.net/bugs/1577558
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4911


Notes
~~~~~
- This fix was included in the openstack/keystone 9.0.1 (mitaka) release.


-- 
Morgan Fainberg
OpenStack Vulnerability Management Team

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