| Name | CVE-2021-25735 |
| Description | A 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 990793 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| kubernetes (PTS) | bullseye | 1.20.5+really1.20.2-1 | fixed |
| bookworm | 1.20.5+really1.20.2-1.1 | fixed |
| trixie | 1.32.3+ds-1 | fixed |
| sid | 1.32.3+ds-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| kubernetes | source | (unstable) | 1.20.5+really1.20.2-1 | | | 990793 |
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