CVE-2021-25737
low
CVSS v3
—
CVSS v2
—
VIR risk
2.5
Description
A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-25737
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-25737.html
Vendor advisory: arch — https://security.archlinux.org/ASA-202106-29
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 1.21.1-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 1.20.5+really1.20.2-1 |
| debian | bullseye | fixed | 1.20.5+really1.20.2-1 |
| debian | forky | fixed | 1.20.5+really1.20.2-1 |
| debian | sid | fixed | 1.20.5+really1.20.2-1 |
| debian | trixie | fixed | 1.20.5+really1.20.2-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | k8s.io/kubernetes | >=1.16.0,<1.18.19 | 1.18.19 |
| Go | k8s.io/kubernetes | >=1.19.0,<1.19.11 | 1.19.11 |
| Go | k8s.io/kubernetes | >=1.20.0,<1.20.7 | 1.20.7 |
| Go | k8s.io/kubernetes | >=1.21.0,<1.21.1 | 1.21.1 |
References
- https://security.archlinux.org/ASA-202106-29
- https://www.suse.com/security/cve/CVE-2021-25737.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-25737
- https://github.com/kubernetes/kubernetes/issues/102106
- https://github.com/kubernetes/kubernetes
- https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY
- https://security.netapp.com/advisory/ntap-20211004-0004
- https://github.com/advisories/GHSA-mfv7-gq43-w965
- https://security-tracker.debian.org/tracker/CVE-2021-25737
Verify integrity in audit chain (admin only). AS-IS.