Permissions, Privileges, and Access Controls in Kubelet - CVE-2021-25749

Vulnerability identifier: #VU71640

CSH Severity: Low

CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-25749

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due incorrect privilege management. Windows workloads can be executed with the ContainerAdministrator privileges even when the runAsNonRoot option is set to "true".

Kubelet
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Enterprise Storage
SUSE Linux Enterprise Server 15 SP3 LTSS
Containers Module
kubernetes1.23-client
kubernetes1.23-client-common
kubernetes1.23-client-debuginfo
OpenShift Container Platform for Windows Containers

Install updates from vendor's website.

Kubelet - addressed in versions 1.22.14, 1.23.5, 1.23.11, 1.25.0
kubernetes1.23-client - update to 1.23.17-150300.7.6.1
kubernetes1.23-client-common - update to 1.23.17-150300.7.6.1
kubernetes1.23-client-debuginfo - update to 1.23.17-150300.7.6.1
OpenShift Container Platform for Windows Containers - update to 7.0.0

• https://bugzilla.redhat.com/show_bug.cgi?id=2127808

• Privilege escalation in Kubernetes Kubelet
• Multiple vulnerabilities in Red Hat OpenShift support for Windows Containers
• SUSE update for kubernetes1.23