RHSA-2014:0368 - Security Advisory

Topic

Updated openstack-keystone packages that fix two security issues are now
available for Red Hat Enterprise Linux OpenStack Platform 3.0.

The Red Hat Security Response Team has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

The OpenStack Identity service (keystone) authenticates and authorizes
OpenStack users by keeping track of users and their permitted activities.
The Identity service supports multiple forms of authentication including
user name and password credentials, token-based systems, and
AWS-style logins.

It was found that the ec2token API in keystone, which is used to generate
EC2-style (Amazon Elastic Compute Cloud) credentials, could generate a
token not scoped to a particular trust when creating a token from a
received trust-scoped token. A remote attacker could use this flaw to
retrieve a token that elevated their privileges to all of the trustor's
roles. Note that only OpenStack Identity setups that have EC2-style
authentication enabled were affected. (CVE-2013-6391)

It was found that the the memcache token back end of OpenStack Identity did
not correctly invalidate a revoked trust token, allowing users with revoked
tokens to retain access to services they should no longer be able to
access. Note that only OpenStack Identity setups using the memcache back
end for tokens were affected. (CVE-2014-2237)

Red Hat would like to thank Jeremy Stanley of the OpenStack Project for
reporting CVE-2013-6391. Upstream acknowledges Steven Hardy of Red Hat as
the original reporter of CVE-2013-6391.

All openstack-keystone users are advised to upgrade to these updated
packages, which correct these issues.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat OpenStack grizzly x86_64

Fixes

• BZ - 1039164 - CVE-2013-6391 OpenStack Keystone: trust circumvention through EC2-style tokens
• BZ - 1071434 - CVE-2014-2237 openstack-keystone: trustee token revocation does not work with memcache backend

CVEs

• CVE-2013-6391
• CVE-2014-2237

References

• https://access.redhat.com/security/updates/classification/#moderate