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Saint CDPwn, Who Introduced Himself to the Neighbours
Patron of IP phones, surveillance cameras, and protocols that gossip on the local network.
Life
On 5 February 2020 Armis revealed five vulnerabilities in the Cisco Discovery Protocol, the protocol Cisco devices use to introduce themselves to their neighbours. A single well-crafted packet sent from the same local network was enough to take over Nexus switches, IOS XR routers, IP phones and cameras, or to make them reboot. Hopping from one device to the next, an attacker could cross the segmentation of a whole corporate network.
Prayer
O Saint CDPwn, who greets everyone with a packet in hand, let our devices not get too friendly with the first comer. Amen.
How to celebrate
Celebrated by updating IOS XR, NX-OS and phone firmware, and turning CDP off wherever nobody uses it.
Introduce yourself to everyone, and sooner or later you meet the wrong one.