#kubernetes

### Summary _Short summary of the problem. Make the impact and severity as clear as possible. A flawed implementation of the Kubernetes aggregation layer's authentication flow could enable bypassing RBAC controls. ### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._ It was discovered that the `virt-api` component fails to correctly authenticate the client when receiving API requests over mTLS. In particular, it fails to validate the CN (Common Name) field in the received client TLS certificates against the set of allowed values defined in the `extension-apiserver-authentication` configmap. The Kubernetes API server proxies received client requests through a component called aggregator (part of K8S's API server), and authenticates to the `virt-api` server using a certificate signed by the CA specified via the `--requestheader-client-ca-file` CLI flag. This CA bundle is primarily used in the context of aggr...

### Impact A bug was found in containerd's CRI Attach implementation where a user can exhaust memory on the host due to goroutine leaks. Repetitive calls of CRI Attach (e.g., [`kubectl attach`](https://kubernetes.io/docs/reference/kubectl/generated/kubectl_attach/)) could increase the memory usage of containerd. ### Patches This bug has been fixed in the following containerd versions: * 2.2.0 * 2.1.5 * 2.0.7 * 1.7.29 Users should update to these versions to resolve the issue. ### Workarounds Set up an admission controller to control accesses to `pods/attach` resources. e.g., [Validating Admission Policy](https://kubernetes.io/docs/reference/access-authn-authz/validating-admission-policy/). ### Credits The containerd project would like to thank @Wheat2018 for responsibly disclosing this issue in accordance with the [containerd security policy](https://github.com/containerd/project/blob/main/SECURITY.md). ### References https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025...

### Impact An overly broad default permission vulnerability was found in containerd. - `/var/lib/containerd` was created with the permission bits 0o711, while it should be created with 0o700 - Allowed local users on the host to potentially access the metadata store and the content store - `/run/containerd/io.containerd.grpc.v1.cri` was created with 0o755, while it should be created with 0o700 - Allowed local users on the host to potentially access the contents of Kubernetes local volumes. The contents of volumes might include setuid binaries, which could allow a local user on the host to elevate privileges on the host. - `/run/containerd/io.containerd.sandbox.controller.v1.shim` was created with 0o711, while it should be created with 0o700 The directory paths may differ depending on the daemon configuration. When the `temp` directory path is specified in the daemon configuration, that directory was also created with 0o711, while it should be created with 0o700. ### Patches Thi...

Cybercrime has stopped being a problem of just the internet — it’s becoming a problem of the real world. Online scams now fund organized crime, hackers rent violence like a service, and even trusted apps or social platforms are turning into attack vectors. The result is a global system where every digital weakness can be turned into physical harm, economic loss, or political

## Summary Cross-namespace Secret access vulnerability in DiscoveryServiceCertificate allows users to bypass RBAC and access Secrets in unauthorized namespaces. ## Affected Versions All versions prior to v0.13.4 ## Patched Versions v0.13.4 and later ## Impact Users with permission to create DiscoveryServiceCertificate resources in one namespace can indirectly read Secrets from other namespaces, completely bypassing Kubernetes RBAC security boundaries. ## Workarounds Restrict DiscoveryServiceCertificate create permissions to cluster administrators only until patched version is deployed. ## Credit Thanks to @debuggerchen for the responsible disclosure.

Tel Aviv, Israel, 29th October 2025, CyberNewsWire

### Summary A malicious host may provide a crafted LUKS2 volume to a Contrast pod VM that uses the [secure persistent volume](https://docs.edgeless.systems/contrast/howto/encrypted-storage) feature. The guest will open the volume and write secret data using a volume key known to the attacker. LUKS2 volume metadata is (a) not authenticated and (b) supports null key-encryption algorithms, allowing an attacker to create a volume such that the volume: - Opens (cryptsetup open) without error using any passphrase or token - Records all writes in plaintext (or ciphertext with an attacker-known key) ### Details Contrast uses cryptsetup to setup secure persistent volumes, using the secret seed as key for the cryptsetup encryption. To do so the Contrast Initializer will invoke the `cryptsetup` CLI. If the device provided by Kubernetes is a identified as cryptsetup device, the Initializer assumes a pod restart happened and the device was previously encrypted with the secret seed. The Initia...

Threat actors tied to North Korea have been observed targeting the Web3 and blockchain sectors as part of twin campaigns tracked as GhostCall and GhostHire. According to Kaspersky, the campaigns are part of a broader operation called SnatchCrypto that has been underway since at least 2017. The activity is attributed to a Lazarus Group sub-cluster called BlueNoroff, which is also known as APT38,

### Impact **Note: The exploitation of this issue requires that the malicious user have access to Rancher’s audit log storage.** A vulnerability has been identified in Rancher Manager, where sensitive information, including secret data, cluster import URLs, and registration tokens, is exposed to any entity with access to Rancher audit logs. This happens in two different ways: 1. Secret Annotation Leakage: When creating Kubernetes Secrets using the `stringData` field, the cleartext value is embedded in the `kubectl.kubernetes.io/last-applied-configuration` annotation. This annotation is included in Rancher audit logs within both the request and response bodies, exposing secret material that should be redacted. 2. Cluster Registration Token Leakage: During the import or creation of downstream clusters (Custom, Imported, or Harvester), Rancher audit logs record full cluster registration manifests and tokens, including: a. Non-expiring import URLs such as `/v3/import/<token>_c-m-xxxx.yam...

### Impact This is an authentication bypass vulnerability in the Karmada Dashboard API. The backend API endpoints (e.g., /api/v1/secret, /api/v1/service) did not enforce authentication, allowing unauthenticated users to access sensitive cluster information such as Secrets and Services directly. Although the web UI required a valid JWT for access, the API itself remained exposed to direct requests without any authentication checks. Any user or entity with network access to the Karmada Dashboard service could exploit this vulnerability to retrieve sensitive data. ### Patches The issue has been fixed in Karmada Dashboard v0.2.0. This release enforces authentication for all API endpoints. Users are strongly advised to upgrade to version v0.2.0 or later as soon as possible. ### Workarounds If upgrading is not immediately feasible, users can mitigate the risk by: - Restricting network access to the Karmada Dashboard service using Kubernetes Network Policies, firewall rules, or ingress con...