CVE-2023-5366

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license.

Security Fix(es):

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.(CVE-2023-5366)

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

These are all security issues fixed in the libopenvswitch-3_1-0-3.1.0-18.1 package on the GA media of openSUSE Tumbleweed.

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch3 fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

• CVE-2023-5366: Fixed missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

Update to v3.1.7:

• CVE-2023-3966: openvswitch, openvswitch3: Invalid memory access in Geneve with HW offload (bsc#1219465).
• CVE-2024-2182: openvswitch: ov: insufficient validation of incoming BFD packets may lead to denial of service (bsc#1255435).
• CVE-2023-1668: openvswitch: remote traffic denial of service via crafted packets with IP proto 0 (bsc#1210054).
• CVE-2023-3153: openvswitch,openvswitch3: service monitor MAC flow is not rate limited (bsc#1212125).
• CVE-2023-5366: openvswitch: missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch3 fixes the following issues:

Update to v3.1.7:

• CVE-2023-3966: openvswitch, openvswitch3: Invalid memory access in Geneve with HW offload (bsc#1219465).
• CVE-2024-2182: openvswitch: ov: insufficient validation of incoming BFD packets may lead to denial of service (bsc#1255435).
• CVE-2023-1668: openvswitch: remote traffic denial of service via crafted packets with IP proto 0 (bsc#1210054).
• CVE-2023-3153: openvswitch,openvswitch3: service monitor MAC flow is not rate limited (bsc#1212125).
• CVE-2023-5366: openvswitch: missing masks on a final stage with ports trie (bsc#1216002).

This update for openvswitch fixes the following issues:

Update OpenvSwitch to v3.1.7 and OVN to v23.03.3.

Security issues fixed:

• CVE-2023-3966: ovs: invalid memory access and potential denial of service via specially crafted Geneve packets (bsc#1219465).
• CVE-2023-5366: ovs: OpenFlow rules may be bypassed via specially crafted ICMPv6 Neighbor Advertisement packets sent between virtual machines t(bsc#1216002).
• CVE-2024-2182: ovn: denial of service via injection of specially crafted BFD packets from inside unprivileged workloads (bsc#1255435).
• CVE-2025-0650: ovn: egress ACLs may be bypassed via specially crafted UDP packet (bsc#1236353).

Other updates and bugfixes:

• OpenvSwitch:
  • https://www.openvswitch.org/releases/NEWS-3.1.7.txt
  • v3.1.7
    • Bug fixes
    • OVS validated with DPDK 22.11.7.
  • v3.1.6
    • Bug fixes
    • OVS validated with DPDK 22.11.6.
  • v3.1.5
    • Bug fixes
    • OVS validated with DPDK 22.11.5.
  • v3.1.4
    • Bug fixes
    • OVS validated with DPDK 22.11.4.
• OVN:
  • https://github.com/ovn-org/ovn/blob/branch-23.03/NEWS
  • v23.03.3
    • Bug fixes
    • Add "garp-max-timeout-sec" config option to vswitchd external-ids to cap the time between when ovn-controller sends gARP packets.
  • v23.03.1
    • Bug fixes
    • CT entries are not flushed by default anymore whenever a load balancer backend is removed. A new, per-LB, option 'ct_flush' can be used to restore the previous behavior. Disabled by default.
    • Always allow IPv6 Router Discovery, Neighbor Discovery, and Multicast Listener Discovery protocols, regardless of ACLs defined.
    • Send ICMP Fragmentation Needed packets back to offending ports when communicating with multichassis ports using frames that don't fit through a tunnel. This is done only for logical switches that are attached to a physical network via a localnet port, in which case multichassis ports may have an effective MTU different from regular ports and hence may need this mechanism to maintain connectivity with other peers in the network.
    • ECMP routes use L4_SYM dp-hash by default if the datapath supports it. Existing sessions might get re-hashed to a different ECMP path when OVN detects the algorithm support in the datapath during an upgrade or restart of ovn-controller.

This update for openvswitch fixes the following issues:

Update OpenvSwitch to v3.1.7 and OVN to v23.03.3:

Security issues fixed:

• CVE-2023-3966: ovs: invalid memory access and potential denial of service via specially crafted Geneve packets (bsc#1219465).
• CVE-2023-5366: ovs: OpenFlow rules may be bypassed via specially crafted ICMPv6 Neighbor Advertisement packets sent between virtual machines t(bsc#1216002).
• CVE-2024-2182: ovn: denial of service via injection of specially crafted BFD packets from inside unprivileged workloads (bsc#1255435).
• CVE-2025-0650: ovn: egress ACLs may be bypassed via specially crafted UDP packet (bsc#1236353).

Other updates and bugfixes:

• OpenvSwitch upstream bugfix updates:

  • https://www.openvswitch.org/releases/NEWS-3.1.7.txt
  • v3.1.7
    • Bug fixes
    • OVS validated with DPDK 22.11.7.
  • v3.1.6
    • Bug fixes
    • OVS validated with DPDK 22.11.6.
  • v3.1.5
    • Bug fixes
    • OVS validated with DPDK 22.11.5.
  • v3.1.4
    • Bug fixes
    • OVS validated with DPDK 22.11.4.

• OVN upstream bugfix updates:

  • https://github.com/ovn-org/ovn/blob/branch-23.03/NEWS
  • v23.03.3
    • Bug fixes
    • Add "garp-max-timeout-sec" config option to vswitchd external-ids to cap the time between when ovn-controller sends gARP packets.
  • v23.03.1
    • Bug fixes
    • CT entries are not flushed by default anymore whenever a load balancer backend is removed. A new, per-LB, option 'ct_flush' can be used to restore the previous behavior. Disabled by default.
    • Always allow IPv6 Router Discovery, Neighbor Discovery, and Multicast Listener Discovery protocols, regardless of ACLs defined.
    • Send ICMP Fragmentation Needed packets back to offending ports when communicating with multichassis ports using frames that don't fit through a tunnel. This is done only for logical switches that are attached to a physical network via a localnet port, in which case multichassis ports may have an effective MTU different from regular ports and hence may need this mechanism to maintain connectivity with other peers in the network.
    • ECMP routes use L4_SYM dp-hash by default if the datapath supports it. Existing sessions might get re-hashed to a different ECMP path when OVN detects the algorithm support in the datapath during an upgrade or restart of ovn-controller.

It was discovered that Open vSwitch did not correctly handle OpenFlow rules for ICMPv6 Neighbour Advertisement packets. A local attacker could possibly use this issue to redirect traffic to arbitrary IP addresses.

Timothy Redaelli and Haresh Khandelwal discovered that Open vSwitch incorrectly handled certain crafted Geneve packets when hardware offloading via the netlink path is enabled. A remote attacker could possibly use this issue to cause Open vSwitch to crash, leading to a denial of service. (CVE-2023-3966)

It was discovered that Open vSwitch incorrectly handled certain ICMPv6 Neighbor Advertisement packets. A remote attacker could possibly use this issue to redirect traffic to arbitrary IP addresses. (CVE-2023-5366)