========================================================= OSSA-2016-005: Potential reuse of revoked Identity tokens =========================================================

:Date: January 29, 2016 :CVE: CVE-2015-7546

Affects ~~~~~~~ - Keystone: <= 2015.1.2, >= 8.0.0 <= 8.0.1 - Keystonemiddleware: >= 1.5.0 <= 1.5.3, >= 1.6.0 <= 2.3.2

Description ~~~~~~~~~~~ Liu Sheng reported a vulnerability in Keystone. By manipulating a token content, an authenticated user may prevent its revocation. This can allow unauthorized access to cloud resources if a revoked token is intercepted by an attacker. Only keystone setups using PKI or PKIZ token are affected

Patches ~~~~~~~ - https://review.openstack.org/266045 (keystone) (Kilo) - https://review.openstack.org/266607 (keystonemiddleware) (Kilo) - https://review.openstack.org/266022 (keystone) (Liberty) - https://review.openstack.org/265988 (keystonemiddleware) (Liberty) - https://review.openstack.org/258141 (keystone) (Mitaka) - https://review.openstack.org/258143 (keystonemiddleware) (Mitaka)

Credits ~~~~~~~ - Liu Sheng from Huawei (CVE-2015-7546)

References ~~~~~~~~~~ - https://bugs.launchpad.net/bugs/1490804 - https://wiki.openstack.org/wiki/OSSN/OSSN-0062 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7546

Notes ~~~~~ - The keystone fix is included in 2015.1.3 (Kilo) and will be included in a future 8.0.2 (Liberty) releases. - The keystonemiddleware fix will be included in future 1.5.4 (Kilo) and 2.3.3 (Liberty) releases. - Both keystone and keystonemiddleware needs to be updated

-- Tristan Cacqueray OpenStack Vulnerability Management Team