SB2019121118 - Information disclosure in Kubernetes CSI sidecar containers for external-provisioner

Description

This security bulletin contains information about 1 security vulnerability.

1) Input validation error (CVE-ID: CVE-2019-11255)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied input in Kubernetes CSI sidecar containers for external-provisioner (versions prior to 0.4.3 and 1.0.2, in version 1.1,  and versions prior to 1.2.2 and 1.3.1), external-snapshotter (versions prior to 0.4.2 and 1.0.2, in version 1.1, versions prior to 1.2.2), and external-resizer (versions 0.1,  and 0.2) . A local user can gain unauthorized PersistentVolume data access or volume mutation during snapshot, restore from snapshot, cloning and resizing operations.

Remediation

Install update from vendor's website.

References

• https://access.redhat.com/errata/RHSA-2019:4099
• https://github.com/kubernetes/kubernetes/issues/85233
• https://groups.google.com/forum/#!topic/kubernetes-security-announce/aXiYN0q4uIw