OSSA-2016-008: Incorrect Audit IDs in Keystone Fernet Tokens can result in revocation bypass

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.

Credits

  • Lance Bragstad from Rackspace (CVE-2016-4911)

Notes

  • This fix was included in the openstack/keystone 9.0.1 (mitaka) release.