UNIX symbolic link following in Kubernetes - CVE-2019-11251
Published: October 31, 2019
Vulnerability identifier: #VU22431
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11251
CWE-ID: CWE-61
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue in kubectl cp. A local user can create two symbolic links and overwrite files on the system with privileges of the application.
Successful exploitation of this vulnerability may result in privilege escalation.
Affected software
Kubernetes
Red Hat OpenShift Container Platform
Red Hat OpenShift Container Platform
How to mitigate CVE-2019-11251
Install updates from vendor's website.
Kubernetes - addressed in versions 1.13.11, 1.14.7, 1.15.4, 1.16.0
Red Hat OpenShift Container Platform - update to 4.1.21
Red Hat OpenShift Container Platform - update to 4.1.21