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.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4816 advisory.

  - 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. (CVE-2019-11244)

  - Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service. The     attacker sends continual pings to an HTTP/2 peer, causing the peer to build an internal queue of     responses. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
    (CVE-2019-9512)

  - 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. (CVE-2019-11246)

  - 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. (CVE-2019-11251)

  - 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. (CVE-2019-11247)

  - 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.
    (CVE-2019-11249)

  - Go before 1.12.10 and 1.13.x before 1.13.1 allow HTTP Request Smuggling. (CVE-2019-16276)

  - Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to     v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads,     causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable.
    Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger     this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by     default for backwards compatibility. (CVE-2019-11253)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update for atomic-openshift is now available for Red Hat OpenShift Container Platform 3.9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.

This advisory contains the atomic-openshift RPM package for Red Hat OpenShift Container Platform 3.9.102.

Security Fix(es) :

* kubernetes: YAML parsing vulnerable to 'Billion Laughs' attack, allowing for remote denial of service (CVE-2019-11253)

* atomic-openshift: OpenShift builds don't verify SSH Host Keys for the Git repository (CVE-2019-10150)

* kubernetes: Incomplete fixes for CVE-2019-1002101 and CVE-2019-11246, kubectl cp potential directory traversal (CVE-2019-11249)

* kubernetes: `kubectl cp` allows for arbitrary file write via double symlinks (CVE-2019-11251)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:3239 advisory.

  - kubernetes: Incomplete fixes for CVE-2019-1002101 and CVE-2019-11246, kubectl cp potential directory     traversal (CVE-2019-11249)

  - kubernetes: YAML parsing vulnerable to Billion Laughs attack, allowing for remote denial of service     (CVE-2019-11253)

  - kube-apiserver: DoS with crafted patch of type json-patch (CVE-2019-1002100)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the kubernetes package has been released.

Update to v1.15.2 + carry upstream #81330

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
180704	Oracle Linux 7 : kubernetes (ELSA-2019-4816)	Nessus	Oracle Linux Local Security Checks	high
130747	RHEL 7 : OpenShift Container Platform 3.9 atomic-openshift (RHSA-2019:3811)	Nessus	Red Hat Local Security Checks	medium
130384	RHEL 7 : OpenShift Container Platform 3.10 atomic-openshift (RHSA-2019:3239)	Nessus	Red Hat Local Security Checks	medium
130125	Photon OS 3.0: Kubernetes PHSA-2019-3.0-0031	Nessus	PhotonOS Local Security Checks	high
129784	Photon OS 1.0: Kubernetes PHSA-2019-1.0-0252	Nessus	PhotonOS Local Security Checks	high
129691	Photon OS 2.0: Kubernetes PHSA-2019-2.0-0177	Nessus	PhotonOS Local Security Checks	high
129682	Photon OS 1.0: Kubernetes PHSA-2019-1.0-0255	Nessus	PhotonOS Local Security Checks	high
128127	Fedora 30 : kubernetes (2019-2b8ef08c95)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2019-11249

medium

Tenable Plugins

high

medium

medium

high

high

high

high

high