CVE-2023-34242
LowCVSS 3.4Exploitation Probability (EPSS)
Low risk22th percentile — higher than 22% of all known CVEs
Summary
Cilium, a networking, observability, and security solution, prior to version 1.13.4 had a vulnerability that allowed unintended access to secrets and services across namespaces when Gateway API was enabled. The lack of namespace checks when creating ReferenceGrant allowed attackers to use secrets that should not be visible to them.
Risk Assessment
The organization may be exposed to unauthorized access to sensitive data and services, potentially leading to serious security incidents. Attackers could exploit this vulnerability to communicate with services they should not have access to.
Recommendation
It is recommended to update Cilium to version 1.13.4 or later. Alternatively, restrict the creation of ReferenceGrant resources to admin users using Kubernetes RBAC.
Original NVD description (English source)
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to version 1.13.4, when Gateway API is enabled in Cilium, the absence of a check on the namespace in which a ReferenceGrant is created could result in Cilium unintentionally gaining visibility of secrets (including certificates) and services across namespaces. An attacker on an affected cluster can leverage this issue to use cluster secrets that should not be visible to them, or communicate with services that they should not have access to. Gateway API functionality is disabled by default. This vulnerability is fixed in Cilium release 1.13.4. As a workaround, restrict the creation of `ReferenceGrant` resources to admin users by using Kubernetes RBAC.