The remote Ubuntu 21.10 host has packages installed that are affected by a vulnerability as referenced in the USN-5242-1 advisory.

    It was discovered that Open vSwitch incorrectly handled certain fragmented packets. A remote attacker     could possibly use this issue to cause Open vSwitch to consume resources, leading to a denial of service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - dpdk: librte_vhost Integer truncation in vhost_user_check_and_alloc_queue_pair() (CVE-2020-10723)

  - openvswitch: Integer Underflow in Organization Specific TLV (CVE-2022-4338)

  - The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote     attackers to cause a denial of service (delays of legitimate traffic) via crafted packet data that     requires excessive evaluation time within the packet classification algorithm for the MegaFlow cache, aka     a Tuple Space Explosion (TSE) attack. (CVE-2019-25076)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

An update of the openvswitch package has been released.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote host is affected by the vulnerability described in GLSA-202311-16 (Open vSwitch: Multiple Vulnerabilities)

  - A flaw was found in multiple versions of OpenvSwitch. Specially crafted LLDP packets can cause memory to     be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service.
    The highest threat from this vulnerability is to system availability. (CVE-2020-27827)

  - A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing     can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel     to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to     system availability. (CVE-2020-35498)

  - A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker     could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
    (CVE-2021-3905)

  - Open vSwitch (aka openvswitch) 2.11.0 through 2.15.0 has a use-after-free in decode_NXAST_RAW_ENCAP     (called from ofpact_decode and ofpacts_decode) during the decoding of a RAW_ENCAP action. (CVE-2021-36980)

  - An out-of-bounds read in Organization Specific TLV was found in various versions of OpenvSwitch.
    (CVE-2022-4337)

  - An integer underflow in Organization Specific TLV was found in various versions of OpenvSwitch.
    (CVE-2022-4338)

  - 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. (CVE-2023-1668)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
156915	Ubuntu 21.10 : Open vSwitch vulnerability (USN-5242-1)	Nessus	Ubuntu Local Security Checks	1/20/2022	8/27/2024	high
199866	RHEL 7 : openvswitch (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	6/3/2024	6/4/2024	critical
204056	Photon OS 3.0: Openvswitch PHSA-2022-3.0-0478	Nessus	PhotonOS Local Security Checks	7/24/2024	7/24/2024	high
195853	RHEL 8 : openvswitch (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	critical
203222	Photon OS 4.0: Openvswitch PHSA-2022-4.0-0271	Nessus	PhotonOS Local Security Checks	7/23/2024	7/23/2024	high
186285	GLSA-202311-16 : Open vSwitch: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	11/26/2023	11/26/2023	critical
195808	RHEL 7 : openvswitch (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	5/11/2024	5/31/2024	critical

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