Vulnerability identifier: #VU22937

Vulnerability risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11244

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

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

Vendor: Kubernetes

Description

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

The vulnerability exists due to insecure default permissions for cache files directory, specified by "-cache-dir" option . A local user in a non-default Kubernetes configuration gain gain read/write access to cache files and gain access to sensitive information or disrupt kubectl invocation.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.8.0 - 1.8.15, 1.9.0 - 1.9.11, 1.10.0 - 1.10.13, 1.11.0 - 1.11.10, 1.12.0 - 1.12.10, 1.13.0 - 1.13.12, 1.14.0 - 1.14.9

---

External links
http://github.com/kubernetes/kubernetes/issues/76676
http://github.com/kubernetes/kubernetes/issues/80581
http://github.com/kubernetes/kubernetes/pull/77874/commits/f228ae3364729caed59087e23c42868454bc3ff4

---

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.