CVE-2023-34242

Description

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.

How to fix CVE-2023-34242

To remediate CVE-2023-34242, upgrade the affected package to a fixed version below.

• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later
• —upgrade to 1.13.4 or later

Is CVE-2023-34242 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (9)

• from 0, < 1.13.4
• from 0, < 1.13.4
• from 0, < 1.13.4
• from 0, < 1.13.4
• from 0, < 1.13.4
• from 0, < 1.13.4
• from 0, < 1.13.4
• >= 1.13.0, < 1.13.4
• >= 1.13.0, < 1.13.4

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-34242
• PATCHgithub.com/cilium/cilium
• WEBgithub.com/cilium/cilium/releases/tag/v1.13.4
• WEBgithub.com/cilium/cilium/security/advisories/GHSA-r7wr-4w5q-55m6