SB2022110606 - Time-of-check time-of-use (TOCTOU) race condition in Kubernetes

Description

This security bulletin contains information about 1 vulnerability.

1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2020-8562)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote privileged user to gain access to potentially sensitive information.

The vulnerability exists due to a time-of-check time-of-use (TOCTOU) race condition flaw in the API Server proxy. A remote privileged user can send a specially-crafted request and exploit this vulnerability to gain access to private networks on the Kubernetes control plane components.

Remediation

Install update from vendor's website.

References

• https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY
• https://github.com/kubernetes/kubernetes/issues/101493
• https://security.netapp.com/advisory/ntap-20220225-0002/