GHSA-r5x6-w42p-jhpp BIT-cilium-2023-27595 BIT-cilium-operator-2023-27595 BIT-cilium-proxy-2023-27595 BIT-hubble-2023-27595 BIT-hubble-relay-2023-27595 BIT-hubble-ui-2023-27595 BIT-hubble-ui-backend-2023-27595 CVE-2023-27595 GO-2023-1644
Cilium eBPF filters may be temporarily removed during agent restart
- Severity
- 6.5 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 0.73%
- Chance of exploitation in the next 30 days. Higher than 54.42% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-755 Improper Handling of Exceptional Conditions
- Fix
1.13.1- Upgrade github.com/cilium/cilium to this version or later
Description
Impact
When Cilium is started, there is a short period when Cilium eBPF programs are not attached to the host. During this period, the host does not implement any of Cilium's featureset. This can cause disruption to newly established connections during this period due to the lack of Load Balancing, or can cause Network Policy bypass due to the lack of Network Policy enforcement during the window. This vulnerability impacts any Cilium-managed endpoints on the node (such as Kubernetes Pods), as well as the host network namespace (including Host Firewall).
Patches
This vulnerability is fixed by https://github.com/cilium/cilium/pull/24336, included in Cilium 1.13.1 or later. Cilium releases 1.12.x, 1.11.x and earlier are not affected.
Workarounds
There are no known workarounds.
Acknowledgements
The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to Louis DeLosSantos and Timo Beckers for investigating and fixing the issue.
For more information
If you have any questions or comments about this advisory, please reach out on 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 versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/cilium/cilium | >= 1.13.0, < 1.13.1 |
1.13.1 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/cilium/cilium Go → 1.13.1
- go
go get github.com/cilium/cilium@v1.13.1 && go mod tidy
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Weakness
CWE-755: Improper Handling of Exceptional Conditions
The product does not handle or incorrectly handles an exceptional condition.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-fm8w-2m5w-9j7r Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match | Medium | Also affects github.com/cilium/cilium |
| GHSA-w7c2-w76w-5hmj Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces | High | Also affects github.com/cilium/cilium |
| GHSA-q6h5-q3q6-f87x CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation | Medium | Also affects github.com/cilium/cilium |
| GHSA-3fcv-jvfp-m4q9 Cilium vulnerable to sensitive information disclosure and cluster disruption via local Envoy admin socket access | High | Also affects github.com/cilium/cilium |
| GHSA-gj49-89wh-h4gj Cillium exposes sensitive information included in the cilium-bugtool debug archive | Medium | Also affects github.com/cilium/cilium |
| GHSA-hxv8-4j4r-cqgv Cilium L7 proxy may bypass Kubernetes NetworkPolicy for same-node traffic | Medium | Also affects github.com/cilium/cilium |
| GHSA-5r23-prx4-mqg3 Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled | Medium | Also affects github.com/cilium/cilium |
| GHSA-38pp-6gcp-rqvm Cilium with misconfigured toGroups in policies can lead to unrestricted egress traffic | Medium | Also affects github.com/cilium/cilium |
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