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Re: [Openstack] [OSSA 2012-014] Revoking a role does not affect existing tokens (CVE-2012-4413)
From: Soren Hansen <soren () linux2go dk>
Date: Wed, 12 Sep 2012 19:32:51 +0200

So if I can grant people access to a particular tenant, I can invalidate
everyone's tokens at will now?

Best regards, Soren.
Sent from my phone. Please pardon my brevity.
On Sep 12, 2012 6:40 PM, "Thierry Carrez" <thierry () openstack org> wrote:

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OpenStack Security Advisory: 2012-014
CVE: CVE-2012-4413
Date: September 12, 2012
Title: Revoking a role does not affect existing tokens
Impact: High
Reporter: Dolph Mathews (Rackspace)
Products: Keystone
Affects: Essex, Folsom

Description:
Dolph Mathews reported a vulnerability in Keystone. Granting and
revoking roles from a user is not reflected upon token validation for
pre-existing tokens. Pre-existing tokens continue to be valid for the
original set of roles for the remainder of the token's lifespan, or
until explicitly invalidated. This fix invalidates all tokens held by
a user upon role grant/revoke to circumvent the issue.

Folsom fix:

http://github.com/openstack/keystone/commit/efb6b3fca0ba0ad768b3e803a324043095d326e2

Essex fix:

http://github.com/openstack/keystone/commit/58ac6691a21675be9e2ffb0f84a05fc3cd4d2e2e

References:
https://bugs.launchpad.net/keystone/+bug/1041396
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2012-4413

Notes:
This fix will be included in the future Keystone 2012.1.3 stable
update and the upcoming Folsom-RC1 development milestone.

- --
Thierry Carrez (ttx)
OpenStack Vulnerability Management Team
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