Permissions, Privileges, and Access Controls in Kubernetes - CVE-2019-11249

Vulnerability identifier: #VU30806

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-11249

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote non-authenticated attacker to manipulate data.

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.

Kubernetes
k3s (Alpine package)
kubernetes
atomic-openshift (Red Hat package)
openshift (Red Hat package)
atomic-enterprise-service-catalog (Red Hat package)
openshift-ansible (Red Hat package)
jenkins-2-plugins (Red Hat package)
Red Hat OpenShift Container Platform
Fedora

Install update from vendor's website.

Kubernetes - update to 1.15.2
k3s (Alpine package) - update to 0.8.0-r0
Red Hat OpenShift Container Platform - update to 4.1.16
kubernetes - update to 1.15.2-1.fc30
atomic-openshift (Red Hat package) - update to 3.10.181-1.git.0.3ab4b3d.el7
openshift (Red Hat package) - addressed in versions 4.1.16-201909090609.git.0.2f97059.el7, 4.1.16-201909090609.git.0.2f97059.el8
atomic-enterprise-service-catalog (Red Hat package) - update to 4.1.16-201909090609.git.1.cc4acc1.el7
openshift-ansible (Red Hat package) - update to 4.1.16-201909090609.git.162.a0800db.el7
jenkins-2-plugins (Red Hat package) - update to 4.1.1567784275-1.el7

• https://access.redhat.com/errata/RHBA-2019:2794
• https://access.redhat.com/errata/RHBA-2019:2816
• https://access.redhat.com/errata/RHBA-2019:2824
• https://access.redhat.com/errata/RHSA-2019:3239
• https://access.redhat.com/errata/RHSA-2019:3811
• https://github.com/kubernetes/kubernetes/issues/80984
• https://groups.google.com/d/msg/kubernetes-security-announce/vUtEcSEY6SM/v2ZZxsmtFQAJ
• https://security.netapp.com/advisory/ntap-20190919-0003/

• Multiple vulnerabilities in Kubernetes Kubernetes
• Permissions, Privileges, and Access Controls in k3s (Alpine package)
• Red Hat OpenShift Container Platform 3.10 update for atomic-openshift
• Permissions, Privileges, and Access Controls in Red Hat OpenShift Container Platform 4.1 packages
• Fedora 30 update for kubernetes