This was published as OSSN-0027:
https://wiki.openstack.org/wiki/OSSN/OSSN-0027
** Changed in: ossn
Status: Fix Committed => Fix Released
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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
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/
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