11-25-2016 08:37 AM
We are looking at rolling out AAA authentication on our network. We use Aruba MAS switches and Aruba APs with Avaya IP phones. I was looking at setting up override conditions on the AAA Profile for the phones and APs to get diverted to a corporate access vlan and skip CPPM role assignment. for the APs I was planning to use a device-group ap profile to override the interface-group AAA profile. Similar to this:
For the phones I was looking at setting a derivation rule on the AAA profile similar to this:
aaa derivation-rules user test
set vlan condition device-type equals "phone" set-value XXX
My question is how secure is this setup? Can the proprietary LLDP TLVs be spoofed easily so that a hacker PC could mimic a phone or AP and get diverted straight into a corporate access vlan bypassing the rest of the AAA profile role assignment conditions?
Re: LLDP Spoofing?
Re: LLDP Spoofing?
11-26-2016 03:03 AM
LLDP can be easily spoofed (as can CDP). Tools to do so, like VoipHopper (CDP) and LLDP Generator (LLDP) are publicly available.
Example with LLDP Generator:
./tool.py -p lldp -tlv sys-name "FakePhone" -tlv sys-desc "See, I can spoof LLDP" -tlv chid -ipv4 "188.8.131.52"
Will show on your switch like:
HPE-Aruba-Lab3810# show lldp info remote-device 4 LLDP Remote Device Information Detail Local Port : 4 ChassisType : network-address ChassisId : 184.108.40.206 PortType : mac-address PortId : 30 85 a9 aa aa aa SysName : FakePhone System Descr : See, I can spoof LLDP PortDescr : Pvid : System Capabilities Supported : System Capabilities Enabled : Remote Management Address
I did not take the time so spoof the system capabilities, but that should not be that hard to fake your Avaya Phone. So it is okay to use LLDP as a convenience feature, probably not to use it as a securlty feature as there is no protection whatsoever in the protocol.
The more secure solution would be to really authenticate the phone with 802.1X; the required securlty level depends on what is acceptable in your environment and was the outcome of the security assessment.
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