RHSA-2022:8827: Red Hat Security Advisory: RHACS 3.73 enhancement and security update

Ubuntu Security Notice 5776-1 - It was discovered that containerd incorrectly handled memory when receiving certain faulty Exec or ExecSync commands. A remote attacker could possibly use this issue to cause a denial of service or crash containerd. It was discovered that containerd incorrectly set up inheritable file capabilities. An attacker could possibly use this issue to escalate privileges inside a container. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS.

Red Hat Security Advisory 2022-8827-01 - Updated images are now available for Red Hat Advanced Cluster Security (RHACS). The updated image includes new features and bug fixes.

## Summary A number of vulnerabilities have been found in `cosign verify-blob`, where Cosign would successfully verify an artifact when verification should have failed. ## Vulnerability 1: Bundle mismatch causes invalid verification. ### Summary A cosign bundle can be crafted to successfully verify a blob even if the embedded rekorBundle does not reference the given signature. ### Details Cosign supports "bundles" which intend to allow offline verification of the signature and rekor inclusion. By using the --bundle flag in cosign sign-blob, cosign will create a JSON file called a "bundle". These bundles include three fields: base64Signature, cert, and rekorBundle. The desired behavior is that the verification of these bundles would: - verify the provided blob using the included signature and certificate - verify the rekorBundle SET - verify the rekorBundle payload references the given artifact. It appears that step three is not being performed, allowing "any old rekorBundle" to p...

Cosign is a project under the sigstore organization which aims to make signatures invisible infrastructure. In versions prior to 1.12.0 a number of vulnerabilities have been found in cosign verify-blob, where Cosign would successfully verify an artifact when verification should have failed. First a cosign bundle can be crafted to successfully verify a blob even if the embedded rekorBundle does not reference the given signature. Second, when providing identity flags, the email and issuer of a certificate is not checked when verifying a Rekor bundle, and the GitHub Actions identity is never checked. Third, providing an invalid Rekor bundle without the experimental flag results in a successful verification. And fourth an invalid transparency log entry will result in immediate success for verification. Details and examples of these issues can be seen in the GHSA-8gw7-4j42-w388 advisory linked. Users are advised to upgrade to 1.12.0. There are no known workarounds for these issues.

Red Hat Security Advisory 2022-4956-01 - Red Hat Advanced Cluster Management for Kubernetes 2.5.0 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and security issues. Issues addressed include privilege escalation and traversal vulnerabilities.

Red Hat Advanced Cluster Management for Kubernetes 2.5.0 is now generally available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE links in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original. Related CVEs: * CVE-2021-3918: nodejs-json-schema: Prototype pollution vulnerability * CVE-2021-41190: opencontainers: OCI manifest and index parsing confusion * CVE-2021-43565: golang.org/x/crypto: empty plaintext packet causes panic * CVE-2021-43816: containerd: Unprivileged pod may bind mount any privileged regular file on disk * CVE-2021-43858: minio: user priv...

The imgcrypt library provides API exensions for containerd to support encrypted container images and implements the ctd-decoder command line tool for use by containerd to decrypt encrypted container images. The imgcrypt function `CheckAuthorization` is supposed to check whether the current used is authorized to access an encrypted image and prevent the user from running an image that another user previously decrypted on the same system. In versions prior to 1.1.4, a failure occurs when an image with a ManifestList is used and the architecture of the local host is not the first one in the ManifestList. Only the first architecture in the list was tested, which may not have its layers available locally since it could not be run on the host architecture. Therefore, the verdict on unavailable layers was that the image could be run anticipating that image run failure would occur later due to the layers not being available. However, this verdict to allow the image to run enabled other archite...