CVE-2023-27594
As a consequence, network policies for that cluster might be bypassed, depending on the specific network policies enabled.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.55%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, 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. This issue only manifests when Cilium is routing IPv6 traffic and NodePorts are used to route traffic to pods. IPv6 and endpoint routes are both disabled by default. The problem has been fixed and is available on versions 1.11.15, 1.12.8, and 1.13.1. As a workaround, disable IPv6 routing.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 0.55% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-285, CWE-863
- Affected
- cilium/cilium
- Source
- security-advisories@github.com
References
- https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
- https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hcThird Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
- https://github.com/cilium/cilium/security/advisories/GHSA-8fg8-jh2h-f2hcThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.