=========================================================================== OSSA-2015-012: Neutron L2 agent DoS through incorrect allowed address pairs ===========================================================================

:Date: June 23, 2015 :CVE: CVE-2015-3221

Affects ~~~~~~~ - Neutron: 2014.2 versions through 2014.2.3 and 2015.1.0 version

Description ~~~~~~~~~~~ Darragh O'Reilly from HP reported a vulnerability in Neutron. By adding an address pair which is rejected as invalid by the ipset tool, an authenticated user may crash the Neutron L2 agent resulting in a denial of service attack. Neutron setups using the IPTables firewall driver are affected.

Patches ~~~~~~~ - https://review.openstack.org/194696 (Juno) - https://review.openstack.org/194697 (Kilo) - https://review.openstack.org/194695 (Liberty)

Credits ~~~~~~~ - Darragh O'Reilly from HP (CVE-2015-3221)

References ~~~~~~~~~~ - https://launchpad.net/bugs/1461054 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3221

Notes ~~~~~ - This fix will be included in future 2014.2.4 (juno) and 2015.1.1 (kilo) releases. - Zero prefixed address pairs are no longer accepted by the Juno API, users need to use 0.0.0.0/1 and 128.0.0.1/1 or ::/1 and 8000::/1 instead. The fix_zero_length_ip_prefix.py tool is provided to clean ports previously configured with a zero prefixed address pair

-- Tristan Cacqueray OpenStack Vulnerability Management Team