Vulnerability identifier: #VU23548

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11255

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Kubernetes
Server applications / Frameworks for developing and running applications

Vendor: Kubernetes

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.16.0 - 1.16.3, 1.12.0 - 1.12.10

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

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.