CVE-2023-30851 Potential HTTP policy bypass when using header rules in Cilium
Attackers can bypass HTTP policies in Cilium when specific multi-endpoint allow-all rules are configured, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-30851?
CVE-2023-30851 is a low-severity vulnerability in cilium, published on 25 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. This issue only impacts users who have a HTTP policy that applies to multiple `toEndpoints` AND have an allow-all rule in place that affects only one of those endpoints. In such cases, a wildcard rule will be appended to the set of HTTP rules, which could cause bypass of HTTP policies. This issue has been patched in Cilium 1.11.16, 1.12.9, and 1.13.2.
Weakness: CWE-693
Which versions are affected by CVE-2023-30851?
14 open source packages ship an affected version, including github.com/cilium/cilium, cilium and cilium-operator. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cilium/cilium Go | All versions | 1.11.16, 1.12.9, 1.13.2 |
github.com/cilium/cilium Go | All versions | 1.11.16 |
github.com/cilium/cilium Go | All versions | 1.11.16 |
github.com/cilium/cilium Go | From 1.12.0 | 1.12.9 |
github.com/cilium/cilium Go | From 1.12.0 | 1.12.9 |
github.com/cilium/cilium Go | From 1.13.0 | 1.13.2 |
8 more packages
github.com/cilium/cilium Go | From 1.13.0 | 1.13.2 |
cilium Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
cilium-operator Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
cilium-proxy Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
hubble Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
hubble-relay Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
hubble-ui Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
hubble-ui-backend Bitnami | All versions | 1.11.16, 1.12.9, 1.13.2 |
Products include Cilium Cilium.
How do I fix CVE-2023-30851?
Upgrade github.com/cilium/cilium to a fixed version for your release line: 1.11.16, 1.12.9 or 1.13.2.
Is CVE-2023-30851 being exploited?
There is no known exploitation of CVE-2023-30851 in the wild and no public exploit code.
Other vulnerabilities in cilium
- CVE-2026-49445 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access
- CVE-2022-29178 Incorrect Default Permissions in Cilium
- CVE-2024-28860 Insecure IPsec transport encryption in Cilium
- CVE-2026-41520 Cillium exposes sensitive information included in the cilium-bugtool debug archive
- CVE-2024-37307 Cilium leaks sensitive information in cilium-bugtool
Sources
Also known as BIT-cilium-2023-30851, BIT-cilium-operator-2023-30851, BIT-cilium-proxy-2023-30851, BIT-hubble-2023-30851, BIT-hubble-relay-2023-30851, BIT-hubble-ui-2023-30851 and 3 more.