Vulnerability · Published Mar 17, 2023 · Assigned by GitHub_M
CVE-2023-27595Cilium eBPF filters may be temporarily removed during agent restart
Medium 6.5
In plain English
A medium-severity security flaw in cilium from cilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In version 1.13.0, 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). This vulnerability is fixed in Cilium 1.13.1 or later. Cilium releases 1.12.x, 1.11.x, and earlier are not affected. There are no known workarounds.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/cilium/cilium | 1.13.1 | GHSA-r5x6-w42p-jhpp |
| Go | github.com/cilium/cilium | 1.13.1 | GO-2023-1644 |
Affected products (as reported)
Weakness: CWE-755 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
References
- https://github.com/cilium/cilium/security/advisories/GHSA-r5x6-w42p-jhpp x_refsource_CONFIRM
- https://github.com/cilium/cilium/pull/24336 x_refsource_MISC
- https://github.com/cilium/cilium/releases/tag/v1.13.1 x_refsource_MISC