Applying fine-grain policy action to encapsulated network attacks

摘要

An intrusion detection system inspects encapsulated packet flows and, upon detecting a malicious encapsulated packet flow, may close an encapsulated network session corresponding to the malicious flow or drop sub-packets of the malicious flow without acting against non-malicious sub-packets and/or sessions. In one example, a network device includes a flow analysis module that receives a packet flow packets, each packet comprising a packet header and one or more sub-packets each corresponding to respective network sessions, an attack detection module that identifies at least one of the network sessions as a malicious network session, a policy action module that executes a policy action on the sub-packet corresponding to the malicious network session based on the identification of the malicious network session, and a forwarding component that forms a reconstructed packet comprising the packet header and the sub-packets excluding the sub-packet corresponding to the malicious network session and forwards the reconstructed packet.

主权项

1. A method comprising:
receiving, with an intrusion prevention device, a packet of a packet flow, the packet comprising a packet header and a plurality of sub-packets encapsulated within a payload of the packet, each of the plurality of sub-packets corresponding to respective encapsulated network sessions, wherein the intrusion prevention device is positioned between a source of the packet and a destination for the packet; analyzing, with the intrusion prevention device, each of the plurality of sub-packets encapsulated within the packet; identifying, with the intrusion prevention device, one of the encapsulated network sessions as a malicious encapsulated network session based on the analysis of the plurality of sub-packets; executing, with the intrusion prevention device, a targeted policy action on the one of the sub-packets corresponding to the malicious encapsulated network session based on the identification of the encapsulated network session as a malicious encapsulated network session; forming, with the intrusion prevention device, a reconstructed packet comprising the packet header and the plurality of sub-packets excluding at least the sub-packet corresponding to the malicious encapsulated network session; and forwarding the reconstructed packet with the intrusion prevention device.