CVE-2023-27594

Impact

## Impact 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. Only IPv6 traffic is impacted by this vulnerability. This issue only manifests when: * Cilium is routing IPv6 traffic, and * Kube-proxy is used for service handling, and * NodePorts are used to route traffic to pods. IPv6 is disabled by default. Cilium's kube-proxy replacement feature is not affected by this vulnerability. ## Patches The problem has been fixed and is available on versions >=1.11.15, >=1.12.8, >=1.13.1 ## Workarounds Disable IPv6 routing (IPv6 is disabled by default). ## Acknowledgements The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to Yusuke Suzuki for both highlighting and fixing the issue. ## For more information If you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack). As usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: security@cilium.io - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.

Affected packages

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• GitHub advisory
• 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/releases/tag/v1.13.1
• https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hc
• https://github.com/advisories/GHSA-8fg8-jh2h-f2hc
• https://nvd.nist.gov/vuln/detail/CVE-2023-27594