Katalog CVE

CVE-2026-120091

WysokieCVSS 8.7
Opublikowano: Przetłumaczono: NVD NIST

Streszczenie

Temporal Server zawiera moduł Worker Controller Instance (go.temporal.io/auto-scaled-workers), który rejestruje dostawcę obliczeń 'k8s' budującego klienta Kubernetes na podstawie konfiguracji z żądania wywołującego, a nie z konfiguracji operatora. Uwierzytelniony użytkownik z uprawnieniami tylko do odczytu w jednej przestrzeni nazw może wywołać operację ValidateWorkerDeploymentVersionComputeConfig, co prowadzi do wykonania dowolnego polecenia na hoście Worker Service z uprawnieniami procesu serwera. Ponieważ proces ten posiada dane uwierzytelniające do wszystkich przestrzeni nazw i materiały TLS klastra, skutki wykraczają poza przestrzeń nazw wywołującego.

Ocena ryzyka

Podatność pozwala na eskalację uprawnień i wykonanie dowolnego polecenia na hoście Worker Service, co może prowadzić do przejęcia całego klastra Kubernetes i dostępu do danych wszystkich przestrzeni nazw. W wersjach 1.31.0–1.31.2 domyślna konfiguracja jest podatna, jeśli allowlista dostawców obliczeń nie jest ustawiona.

Rekomendacja

Zaktualizuj Temporal Server do wersji 1.31.3 lub nowszej (albo 1.32.0 lub nowszej) i upewnij się, że ustawienie workercontroller.compute_providers.enabled nie zawiera 'k8s' (a w wersjach 1.31.0–1.31.2 jest jawnie ustawione). Sprawdź również, czy niestandardowy autoryzator nie zezwala na wywołanie ValidateWorkerDeploymentVersionComputeConfig bez uprawnień zapisu do przestrzeni nazw.

Inne podatności w Temporal Server

Zobacz wszystkie
Oryginalny opis (angielski, źródło NVD)

Temporal Server compiles a Worker Controller Instance module, go.temporal.io/auto-scaled-workers, into its Worker Service, and that module registers a compute provider named k8s whose function is to manage workers running in a Kubernetes cluster. The k8s provider built its Kubernetes client from the client configuration supplied in the caller's request rather than from operator configuration, and building and using that client could run a command of the caller's choosing on the Worker Service host, under the account the server process runs as. Two frontend operations reach the provider. CreateWorkerDeploymentVersion requires a namespace write role. ValidateWorkerDeploymentVersionComputeConfig is registered as a read-only namespace operation, so an authenticated caller holding only a read role in a single namespace can reach the provider through it, and that route does not require a worker deployment to already exist. Execution happens while the submitted configuration is validated, so no scaling decision, task arrival, or unusual request sequence is required. Because the Worker Service process holds the persistence credentials for every namespace in the cluster and the cluster's TLS material, the consequence reaches beyond the caller's namespace to the cluster as a whole. The provider is present in the official temporal-server binaries and container images for the affected releases. The control that keeps it unreachable is the compute provider allowlist, the dynamic configuration setting workercontroller.compute_providers.enabled. On Temporal Server 1.31.0 through 1.31.2 that allowlist does not deny by default: when the setting is unset the check is skipped and every registered compute provider is permitted, k8s included, so a stock deployment of those releases is exposed. On 1.31.3 and later 1.31 releases, and on 1.32.0 and later 1.32 releases, the allowlist denies by default, and a deployment is exposed only where k8s has been added to it. The 1.30 release line does not include the Worker Controller Instance module and is unaffected. To determine whether a deployment is affected, check the following together. The deployed Temporal Server version is in an affected range. The Worker Service is running, which it is in the default service set and therefore in a stock deployment. The effective value of workercontroller.compute_providers.enabled contains k8s, or, on 1.31.0 through 1.31.2 only, is unset; check both the global value and every namespace-constrained override, because an override can add k8s for a single namespace. And authorization is configured, meaning a real authorizer and claim mapper are in place; a deployment running with no authorizer already grants every caller unrestricted access to every namespace, so it has no namespace boundary for this to cross. Deployments that use a custom authorizer should also check whether it permits ValidateWorkerDeploymentVersionComputeConfig to callers without namespace write access. The separate per-namespace dynamic configuration setting workercontroller.enabled does not gate the affected path on any affected release.

Dane podatności pochodzą z NVD (NIST) · CISA KEV · EPSS