Open Stack

I believe the assertion is that Neutron's flat networking implementation
does not provide layer 2 filtering guarantees between tenants on the
same broadcast domain, unlike Nova's, and that this is a design
shortcoming/feature parity gap which should be better documented for
existing releases and fixed in new releases as a priority feature for
security hardening reasons.

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https://bugs.launchpad.net/bugs/1274034

Title:
  Neutron firewall anti-spoofing does not prevent ARP poisoning

Status in OpenStack Neutron (virtual network service):
  In Progress
Status in OpenStack Security Advisories:
  Invalid

Bug description:
  The neutron firewall driver 'iptabes_firawall' does not prevent ARP cache poisoning.
  When anti-spoofing rules are handled by Nova, a list of rules was added through the libvirt network filter feature:
  - no-mac-spoofing
  - no-ip-spoofing
  - no-arp-spoofing
  - nova-no-nd-reflection
  - allow-dhcp-server

  Actually, the neutron firewall driver 'iptabes_firawall' handles only
  MAC and IP anti-spoofing rules.

  This is a security vulnerability, especially on shared networks.

  Reproduce an ARP cache poisoning and man in the middle:
  - Create a private network/subnet 10.0.0.0/24
  - Start 2 VM attached to that private network (VM1: IP 10.0.0.3, VM2: 10.0.0.4)
  - Log on VM1 and install ettercap [1]
  - Launch command: 'ettercap -T -w dump -M ARP /10.0.0.4/ // output:'
  - Log on too on VM2 (with VNC/spice console) and ping google.fr => ping is ok
  - Go back on VM1, and see the VM2's ping to google.fr going to the VM1 instead to be send directly to the network gateway and forwarded by the VM1 to the gw. The ICMP capture looks something like that [2]
  - Go back to VM2 and check the ARP table => the MAC address associated to the GW is the MAC address of VM1

  [1] http://ettercap.github.io/ettercap/
  [2] http://paste.openstack.org/show/62112/

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