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