Intermittent HTTP policy bypass

Impact

Cilium’s HTTP policies are not consistently applied to all traffic in the scope of the policies, leading to HTTP traffic being incorrectly and intermittently forwarded when it should be dropped.

Patches

This issue affects:

• Cilium v1.13 between v1.13.9 and v1.13.12 inclusive
• Cilium v1.14 between v1.14.0 and v1.14.7 inclusive
• Cilium v1.15.0 and v1.15.1

This issue has been patched in:

• Cilium v1.15.2
• Cilium v1.14.8
• Cilium v1.13.13

Workarounds

There is no workaround for this issue – affected users are strongly encouraged to upgrade.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @romikps for discovering and reporting this issue, and @sayboras and @jrajahalme for preparing the fix.

For more information

If you have any questions or comments about this advisory, please reach out on Slack.

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [email protected]. This is a private mailing list for the Cilium internal security team, and your report will be treated as top priority.