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CVE-2020-8557

Kubernetes node disk Denial of Service by writing to container /etc/hosts

The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift
CVE-2020-8555

Kubernetes kube-controller-manager SSRF

The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).

CVSS 3.1 · 6.3 Medium EPSS 3.7% KEV · Not listed
Vendors
Fedoraproject Kubernetes Redhat
Products
Fedora Kubernetes Openshift
CVE-2020-8553

Kubernetes ingress-nginx Compromise of auth via subset/superset namespace names

The Kubernetes ingress-nginx component prior to version 0.28.0 allows a user with the ability to create namespaces and to read and create ingress objects to overwrite the password file of another ingress which uses nginx.ingress.kubernetes.io/auth-type: basic and which has a hyphenated namespace or secret name.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Kubernetes
Products
Ingress-nginx
CVE-2020-8552

Kubernetes API server denial of service

The Kubernetes API server component in versions prior to 1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via successful API requests.

CVSS 3.1 · 5.3 Medium EPSS 2.8% KEV · Not listed
Vendors
Fedoraproject Kubernetes Redhat
Products
Fedora Kubernetes Openshift
CVE-2020-8551

Kubernetes kubelet denial of service

The Kubelet component in versions 1.15.0-1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via the kubelet API, including the unauthenticated HTTP read-only API typically served on port 10255, and the authenticated HTTPS API typically served on port 10250.

CVSS 3.1 · 4.3 Medium EPSS 1.2% KEV · Not listed
Vendors
Fedoraproject Kubernetes Redhat
Products
Fedora Kubernetes Openshift
CVE-2019-9946

kubernetes: Incorrect rule injection in CNI portmap plugin

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes. The CNI 'portmap' plugin, used to setup HostPorts for CNI, inserts rules at the front of the iptables nat chains; which take precedence over the KUBE- SERVICES chain. Because of this, the HostPort/portmap rule could match incoming traffic even if there were better fitting, more specific service definition rules like NodePorts later in the chain. The issue is fixed in CNI 0.7.5 and Kubernetes 1.11.9, 1.12.7, 1.13.5, and 1.14.0.

CVSS 3.0 · 7.5 High EPSS 3.2% KEV · Not listed
Vendors
Cncf Kubernetes Netapp and 1 more
Products
Portmap Kubernetes Cloud Insights and 2 more
CVE-2019-14891

cri-o: infra container reparented to systemd following OOM Killer killing it's conmon

A flaw was found in cri-o, as a result of all pod-related processes being placed in the same memory cgroup. This can result in container management (conmon) processes being killed if a workload process triggers an out-of-memory (OOM) condition for the cgroup. An attacker could abuse this flaw to get host network access on an cri-o host.

CVSS 3.1 · 5.0 Medium EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Kubernetes Redhat
Products
Fedora Cri-o Openshift and 1 more
CVE-2019-11255

Kubernetes CSI volume snapshot, cloning and resizing features can result in unauthorized volume data access or mutation

Improper input validation in Kubernetes CSI sidecar containers for external-provisioner (<v0.4.3, <v1.0.2, v1.1, <v1.2.2, <v1.3.1), external-snapshotter (<v0.4.2, <v1.0.2, v1.1, <1.2.2), and external-resizer (v0.1, v0.2) could result in unauthorized PersistentVolume data access or volume mutation during snapshot, restore from snapshot, cloning and resizing operations.

CVSS 3.1 · 4.8 Medium EPSS 2.0% KEV · Not listed
Vendors
Kubernetes Redhat
Products
External-provisioner External-resizer External-snapshotter and 2 more
CVE-2019-11254

Kubernetes API Server denial of service vulnerability from malicious YAML payloads

The Kubernetes API Server component in versions 1.1-1.14, and versions prior to 1.15.10, 1.16.7 and 1.17.3 allows an authorized user who sends malicious YAML payloads to cause the kube-apiserver to consume excessive CPU cycles while parsing YAML.

CVSS 3.1 · 6.5 Medium EPSS 3.2% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift
CVE-2019-11252

Credential leakage when failing to mount

The Kubernetes kube-controller-manager in versions v1.0-v1.17 is vulnerable to a credential leakage via error messages in mount failure logs and events for AzureFile and CephFS volumes.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift
CVE-2019-11251

kubectl cp allows symlink directory traversal

The Kubernetes kubectl cp command in versions 1.1-1.12, and versions prior to 1.13.11, 1.14.7, and 1.15.4 allows a combination of two symlinks provided by tar output of a malicious container to place a file outside of the destination directory specified in the kubectl cp invocation. This could be used to allow an attacker to place a nefarious file using a symlink, outside of the destination tree.

CVSS 3.1 · 4.8 Medium EPSS 2.6% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift
CVE-2019-11250

Kubernetes client-go logs authorization headers at debug verbosity levels

The Kubernetes client-go library logs request headers at verbosity levels of 7 or higher. This can disclose credentials to unauthorized users via logs or command output. Kubernetes components (such as kube-apiserver) prior to v1.16.0, which make use of basic or bearer token authentication, and run at high verbosity levels, are affected.

CVSS 3.1 · 6.5 Medium EPSS 1.8% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift Openshift Container Platform
CVE-2019-11249

kubectl cp allows symlink directory traversal

The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes runs tar inside the container to create a tar archive, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. Kubernetes affected versions include versions prior to 1.13.9, versions prior to 1.14.5, versions prior to 1.15.2, and versions 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11, 1.12.

CVSS 3.1 · 6.5 Medium EPSS 3.7% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift Openshift Container Platform
CVE-2019-11248

Kubernetes kubelet exposes /debug/pprof info on healthz port

The debugging endpoint /debug/pprof is exposed over the unauthenticated Kubelet healthz port. The go pprof endpoint is exposed over the Kubelet's healthz port. This debugging endpoint can potentially leak sensitive information such as internal Kubelet memory addresses and configuration, or for limited denial of service. Versions prior to 1.15.0, 1.14.4, 1.13.8, and 1.12.10 are affected. The issue is of medium severity, but not exposed by the default configuration.

CVSS 3.1 · 8.2 High EPSS 75.1% KEV · Not listed
Vendors
Kubernetes
Products
Kubernetes
CVE-2019-11247

Kubernetes kube-apiserver allows access to custom resources via wrong scope

The Kubernetes kube-apiserver mistakenly allows access to a cluster-scoped custom resource if the request is made as if the resource were namespaced. Authorizations for the resource accessed in this manner are enforced using roles and role bindings within the namespace, meaning that a user with access only to a resource in one namespace could create, view update or delete the cluster-scoped resource (according to their namespace role privileges). Kubernetes affected versions include versions prior to 1.13.9, versions prior to 1.14.5, versions prior to 1.15.2, and versions 1.7, 1.8, 1.9, 1.10, 1.11, 1.12.

CVSS 3.1 · 8.1 High EPSS 2.1% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift Openshift Container Platform
CVE-2019-11246

kubectl cp allows symlink directory traversal

The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes runs tar inside the container to create a tar archive, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. Kubernetes affected versions include versions prior to 1.12.9, versions prior to 1.13.6, versions prior to 1.14.2, and versions 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11.

CVSS 3.1 · 6.5 Medium EPSS 3.6% KEV · Not listed
Vendors
Kubernetes Redhat
Products
Kubernetes Openshift
CVE-2019-11245

kubelet-started container uid changes to root after first restart or if image is already pulled to the node

In kubelet v1.13.6 and v1.14.2, containers for pods that do not specify an explicit runAsUser attempt to run as uid 0 (root) on container restart, or if the image was previously pulled to the node. If the pod specified mustRunAsNonRoot: true, the kubelet will refuse to start the container as root. If the pod did not specify mustRunAsNonRoot: true, the kubelet will run the container as uid 0.

CVSS 3.0 · 4.9 Medium EPSS < 1% KEV · Not listed
Vendors
Kubernetes
Products
Kubernetes
CVE-2019-11244

kubectl creates world-writeable cached schema files

In Kubernetes v1.8.x-v1.14.x, schema info is cached by kubectl in the location specified by --cache-dir (defaulting to $HOME/.kube/http-cache), written with world-writeable permissions (rw-rw-rw-). If --cache-dir is specified and pointed at a different location accessible to other users/groups, the written files may be modified by other users/groups and disrupt the kubectl invocation.

CVSS 3.1 · 5.0 Medium EPSS < 1% KEV · Not listed
Vendors
Kubernetes Netapp Redhat
Products
Kubernetes Trident Openshift and 1 more
CVE-2019-11243

kubernetes: Authentication information exposure in rest.AnonymousClientConfig()

In Kubernetes v1.12.0-v1.12.4 and v1.13.0, the rest.AnonymousClientConfig() method returns a copy of the provided config, with credentials removed (bearer token, username/password, and client certificate/key data). In the affected versions, rest.AnonymousClientConfig() did not effectively clear service account credentials loaded using rest.InClusterConfig()

CVSS 3.1 · 8.1 High EPSS 1.7% KEV · Not listed
Vendors
Kubernetes Netapp
Products
Kubernetes Trident
CVE-2019-10223

kube-state-metrics: annotations exposed as metrics in combination with `kubectl` can allow for exposure of secrets

A security issue was discovered in the kube-state-metrics versions v1.7.0 and v1.7.1. An experimental feature was added to the v1.7.0 release that enabled annotations to be exposed as metrics. By default, the kube-state-metrics metrics only expose metadata about Secrets. However, a combination of the default `kubectl` behavior and this new feature can cause the entire secret content to end up in metric labels thus inadvertently exposing the secret content in metrics. This feature has been reverted and released as the v1.7.2 release. If you are running the v1.7.0 or v1.7.1 release, please upgrade to the v1.7.2 release as soon as possible.

CVSS 3.1 · 6.5 Medium EPSS 1.8% KEV · Not listed
Vendors
Kubernetes Linux Redhat
Products
Kube-state-metrics Linux Kernel Openshift Container Platform