Link following in Kubernetes - CVE-2019-1002101

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Main Vulnerability Database Vulnerabilities #VU31128

Link following in Kubernetes - CVE-2019-1002101

Published: April 1, 2019 / Updated: July 17, 2020


Vulnerability identifier: #VU31128
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-1002101
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local 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 creates a tar inside the container, 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. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.


Affected software

Kubernetes
Red Hat OpenShift Container Platform
Fedora
kubernetes
atomic-openshift (Red Hat package)
IBM Cloud Pak for Watson AIOps

How to mitigate CVE-2019-1002101

Install update from vendor's website.

Kubernetes - update to 1.13.5
kubernetes - addressed in versions 1.13.5-1.fc29, 1.13.5-1.fc30, 1.15.2-1.fc30
atomic-openshift (Red Hat package) - addressed in versions 3.9.89-1.git.0.9454f2a.el7, 3.10.149-1.git.0.05de590.el7, 3.10.181-1.git.0.3ab4b3d.el7, 3.11.117-1.git.0.14e54a3.el7
IBM Cloud Pak for Watson AIOps - update to 4.8.1

External References

Related Security Bulletins