Open Stack

Darragh O'Reilly, they can not use fake address (I've tested this), but
they can announce it rendering any host in the network disabled.

Or they can announce fake IP and listen for any non-stream protocols
(f.e. UDP). They still will not be able to retransmit it to original or
reply, but can intercept any unidirectional UDP (f.e. pieces of voice
conversations in RTP, or even, pieces of TCP (with cookies! yum!)).
Legitimate host will ask to retransmit them, but malicious VM will
receive one copy of data.

If it will do this sporadically for short time (like once in 10s) it
will not disturb work of the legitimate host significantly (sometimes
TCP will be really slow or stuck, but recover eventually), but  still
allows interception of pieces of traffic.

I think this is a clear vulnerability in neutron without any 'but you
can try to mitigate this' (HOW?).

-- 
You received this bug notification because you are a member of OpenStack
Security, which is subscribed to OpenStack.
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
Status in OpenStack Security Notes:
  Fix Released

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/

To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1274034/+subscriptions