CVE intelligence and bounded remediation

CVE-2023-1260 — An authentication bypass vulnerability was discovered in kube-apiserver

High CVSS 8

An authentication bypass vulnerability was discovered in kube-apiserver. This issue could allow a remote, authenticated attacker who has been given permissions "update, patch" the "pods/ephemeralcontainers" subresource beyond what the default is. They would then need to create a new pod or patch one that they already have access to. This might allow evasion of SCC admission restrictions, thereby gaining control of a privileged pod.

Severity
High
CVSS
8 (3.1)
Published
2023-09-24
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-288

Affected products

  • kubernetes / kube-apiserver
  • redhat / openshift_container_platform / 4.10
  • redhat / openshift_container_platform / 4.11
  • redhat / openshift_container_platform / 4.12
  • redhat / openshift_container_platform / 4.13

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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