CVE-2023-27594 Information

Description

Cilium is a networking observability and security solution with an eBPF-based dataplane. Prior to versions 1.11.15 1.12.8 and 1.13.1 under specific conditions Cilium may misattribute the source IP address of traffic to a cluster identifying external traffic as coming from the host on which Cilium is running. As a consequence network policies for that cluster might be bypassed depending on the specific network policies enabled. This issue only manifests when Cilium is routing IPv6 traffic and NodePorts are used to route traffic to pods. IPv6 and endpoint routes are both disabled by default. The problem has been fixed and is available on versions 1.11.15 1.12.8 and 1.13.1. As a workaround disable IPv6 routing.

Reference

https://github.com/cilium/cilium/releases/tag/v1.13.1 https://github.com/cilium/cilium/releases/tag/v1.11.15 https://github.com/cilium/cilium/releases/tag/v1.12.8 https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc