CVE-2024-43803 (GCVE-0-2024-43803)
Vulnerability from cvelistv5
Published
2024-09-03 18:56
Modified
2024-09-03 19:30
Severity ?
4.9 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-653 - Improper Isolation or Compartmentalization
Summary
The Bare Metal Operator (BMO) implements a Kubernetes API for managing bare metal hosts in Metal3. The `BareMetalHost` (BMH) CRD allows the `userData`, `metaData`, and `networkData` for the provisioned host to be specified as links to Kubernetes Secrets. There are fields for both the `Name` and `Namespace` of the Secret, meaning that versions of the baremetal-operator prior to 0.8.0, 0.6.2, and 0.5.2 will read a `Secret` from any namespace. A user with access to create or edit a `BareMetalHost` can thus exfiltrate a `Secret` from another namespace by using it as e.g. the `userData` for provisioning some host (note that this need not be a real host, it could be a VM somewhere). BMO will only read a key with the name `value` (or `userData`, `metaData`, or `networkData`), so that limits the exposure somewhat. `value` is probably a pretty common key though. Secrets used by _other_ `BareMetalHost`s in different namespaces are always vulnerable. It is probably relatively unusual for anyone other than cluster administrators to have RBAC access to create/edit a `BareMetalHost`. This vulnerability is only meaningful, if the cluster has users other than administrators and users' privileges are limited to their respective namespaces. The patch prevents BMO from accepting links to Secrets from other namespaces as BMH input. Any BMH configuration is only read from the same namespace only. The problem is patched in BMO releases v0.7.0, v0.6.2 and v0.5.2 and users should upgrade to those versions. Prior upgrading, duplicate the BMC Secrets to the namespace where the corresponding BMH is. After upgrade, remove the old Secrets. As a workaround, an operator can configure BMO RBAC to be namespace scoped for Secrets, instead of cluster scoped, to prevent BMO from accessing Secrets from other namespaces.
References
Impacted products
Vendor Product Version
metal3-io baremetal-operator Version: >= 0.7.0, < 0.8.0
Version: >= 0.6.0, < 0.6.2
Version: < 0.5.2
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Un usuario con acceso para crear o editar un `BareMetalHost` puede, por lo tanto, exfiltrar un `Secret` de otro espacio de nombres al usarlo, por ejemplo, como `userData` para aprovisionar alg\u00fan host (tenga en cuenta que no es necesario que sea un host real, podr\u00eda ser una m\u00e1quina virtual en alg\u00fan lugar). BMO solo leer\u00e1 una clave con el nombre `value` (o `userData`, `metaData` o `networkData`), por lo que limita un poco la exposici\u00f3n. `value` es probablemente una clave bastante com\u00fan. Los secretos utilizados por _otros_ `BareMetalHost` en diferentes espacios de nombres siempre son vulnerables. Es probablemente relativamente inusual que alguien que no sea un administrador del cl\u00faster tenga acceso RBAC para crear o editar un `BareMetalHost`. Esta vulnerabilidad solo es significativa si el cl\u00faster tiene usuarios que no sean administradores y los privilegios de los usuarios est\u00e1n limitados a sus respectivos espacios de nombres. 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