CVE-2023-30851: Potential HTTP policy bypass when using header rules in Cilium

May 22, 2023

Impact

This issue only impacts users who:

Have a HTTP policy that applies to multiple toEndpoints AND
Have an allow-all rule in place that affects only one of those endpoints

In such cases, a wildcard rule will be appended to the set of HTTP rules, which could cause bypass of HTTP policies.

References

github.com/advisories/GHSA-2h44-x2wx-49f4
github.com/cilium/cilium/releases/tag/v1.11.16
github.com/cilium/cilium/releases/tag/v1.12.9
github.com/cilium/cilium/releases/tag/v1.13.2
github.com/cilium/cilium/security/advisories/GHSA-2h44-x2wx-49f4

Code Behaviors & Features

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