CVE-2021-25735

NameCVE-2021-25735
DescriptionA security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs990793

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
kubernetes (PTS)bullseye1.20.5+really1.20.2-1fixed
sid, trixie, bookworm1.20.5+really1.20.2-1.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
kubernetessource(unstable)1.20.5+really1.20.2-1990793

Notes

https://www.openwall.com/lists/oss-security/2021/04/14/1
https://github.com/kubernetes/kubernetes/issues/100096
Server components no longer built since 1.20.5+really1.20.2-1, marking that as fixed

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