[Openstack-security] [Bug 1274034] Re: Neutron firewall anti-spoofing does not prevent ARP poisoning
Mathieu Rohon
mathieu.rohon at gmail.com
Thu Mar 27 09:13:44 UTC 2014
this looks like a good patch for a backport in havana, but if a VM
clains that it owns the gateway IP, other VMs of the network will loose
connectivity to other networks. I think that the ebtablemanager proposed
by edouard is the long term solution.
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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):
Triaged
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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