[OSSA 2015-012] Neutron L2 agent DoS through incorrect allowed address pairs (CVE-2015-3221)

[Tristan Cacqueray <tdecacqu () redhat com>]

===========================================================================
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

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