REDHAT-BUG-1954917
First published: Thu Apr 29 2021(Updated: )
A security issue was discovered in Kubernetes where an authorized user may be able to redirect traffic to private networks on a Node. Kubernetes clusters are only affected if an untrusted user can create or modify EndpointSlices. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kubernetes | <1.21.1 | 1.21.1 |
| redhat/kubernetes | <1.20.7 | 1.20.7 |
| redhat/kubernetes | <1.19.11 | 1.19.11 |
| redhat/kubernetes | <1.18.19 | 1.18.19 |
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Reference Links
- https://github.com/kubernetes/kubernetes/pull/101084
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1962296
- https://access.redhat.com/errata/RHSA-2021:2437
- https://access.redhat.com/security/cve/cve-2021-25737
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1954917#c14
- https://bugzilla.redhat.com/show_bug.cgi?id=1954917
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