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.

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.