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When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.", "A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow."], "mitigation": {"lang": "en:us", "value": "For any version of Open vSwitch, preventing packets with network\nprotocol number '0' from reaching Open vSwitch will prevent the issue.\nThis is difficult to achieve because Open vSwitch obtains packets before\nthe iptables or nftables host firewall, so iptables or nftables on the\nOpen vSwitch host cannot ordinarily block the vulnerability.\nAnother method would be to add a high priority flow to the flow table\nexplicitly matching on nw protocol '0' and handling that traffic\nseparately:\ntable=0 priority=32768,ip,ip_proto=0 actions=drop\nThis would need to be similarly done for IPv6 traffic as well."}, "name": "CVE-2023-1668", "package_state": 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are marked as \"Will not fix\".", "threat_severity": "Moderate"}

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