CVE-2020-26278mediumCWE-250

CVE-2020-26278: fallo de gravedad media en weaveworks weave

Weave Net Pods running in host PID namespace can be used to escalate other Kubernetes vulnerabilities

Publicada el · Actualizada el

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Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

13Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 5.8epss 0.7%
En resumen

Los pods de Weave Net en Kubernetes se ejecutaban con acceso innecesario al espacio de nombres de procesos del host (hostPID), permitiendo a un atacante que obtenga ejecución de código dentro del pod tomar control de todo el host. Este era un permiso peligroso que no era necesario para que el software funcionara.

Detalle técnico

CVE-2020-26278 explota la configuración innecesaria de hostPID: true en los manifiestos DaemonSet de Weave Net, permitiendo a un atacante con ejecución de código dentro del pod privilegiado acceder y manipular todos los procesos del host y el sistema de archivos raíz. La vulnerabilidad requiere un vector de ataque secundario (p. ej., otra vulnerabilidad o configuración incorrecta en Kubernetes) para comprometer inicialmente el pod de Weave Net; la explotación permite el compromiso total del host debido a las capacidades combinadas de privilegios elevados y hostPID.

Resumen generado y traducido por IA a partir de la descripción oficial.
Weave Net is open source software which creates a virtual network that connects Docker containers across multiple hosts and enables their automatic discovery. Weave Net before version 2.8.0 has a vulnerability in which can allow an attacker to take over any host in the cluster. Weave Net is supplied with a manifest that runs pods on every node in a Kubernetes cluster, which are responsible for managing network connections for all other pods in the cluster. This requires a lot of power over the host, and the manifest sets `privileged: true`, which gives it that power. It also set `hostPID: true`, which gave it the ability to access all other processes on the host, and write anywhere in the root filesystem of the host. This setting was not necessary, and is being removed. You are only vulnerable if you have an additional vulnerability (e.g. a bug in Kubernetes) or misconfiguration that allows an attacker to run code inside the Weave Net pod, No such bug is known at the time of release, and there are no known instances of this being exploited. Weave Net 2.8.0 removes the hostPID setting and moves CNI plugin install to an init container. Users who do not update to 2.8.0 can edit the hostPID line in their existing DaemonSet manifest to say false instead of true, arrange some other way to install CNI plugins (e.g. Ansible) and remove those mounts from the DaemonSet manifest.
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
Productos afectados
weaveworks · weave