Unbounded name compression could lead to Denial of Service
CVE: CVE-2024-8508
Component: unbound
CWE: CWE-606
Severity: Moderate
CVSS v3: 5.3/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Release date: 2024-10-03T16:27:54.540000+00:00

A flaw was found in Unbound which can lead to degraded performance and an eventual denial of service when handling replies with very large RRsets that require name compression to be applied. Versions prior to 1.21.1 do not have a hard limit on the number of name compression calculations that Unbound can perform per packet, meaning that if a specially crafted query is passed for the contents of a malicious zone with very large RRsets, Unbound may spend a considerable amount of time applying name compression to downstream replies, locking the CPU until the whole packet has been processed.


Remediation:
For OpenShift Container Platform 4.16 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:

      https://docs.openshift.com/container-platform/4.16/release_notes/ocp-4-16-release-notes.html

You may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release tab=tags.

The sha values for the release are as follows:

      (For x86_64 architecture)
      The image digest is sha256:7aacace57ab6ec468dd98b0b3e0f3fc440b29afce21b90bd716fed0db487e9e9

      (For s390x architecture)
      The image digest is sha256:83d85abae03310d7875f484ea2ba5d0224fe9196d7be0556032feb9685282472

      (For ppc64le architecture)
      The image digest is sha256:e9a6f42c118d20b1e81dcd17c4a2166becdd558dd55d5badd33a36cdda5118fa

      (For aarch64 architecture)
      The image digest is sha256:184c6892722a60f87a0efea8eaca8fbbca3cebfc7c0eb6496005c241ce383a22

All OpenShift Container Platform 4.16 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.openshift.com/container-platform/4.16/updating/updating_a_cluster/updating-cluster-cli.html
For OpenShift Container Platform 4.17 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:

      https://docs.openshift.com/container-platform/4.17/release_notes/ocp-4-17-release-notes.html

You may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.

The sha values for the release are as follows:

      (For x86_64 architecture)
      The image digest is sha256:e0907823bc8989b02bb1bd55d5f08262dd0e4846173e792c14e7684fbd476c0d

      (For s390x architecture)
      The image digest is sha256:0ceb174ca670cfa3202ce15e1a884478bd4474c6bf2cf74fac0a44681bfbb8f3

      (For ppc64le architecture)
      The image digest is sha256:460da6202791b5d3ec0ddd71a577723ffc68e35cf728ebbef832ef0a3c42e7be

      (For aarch64 architecture)
      The image digest is sha256:4b48c890a1229bdb587fb4865fbebbb9f466e7e4a9bae0fbc7ec85352c5d6041

All OpenShift Container Platform 4.17 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.openshift.com/container-platform/4.17/updating/updating_a_cluster/updating-cluster-cli.html