Cilium vulnerable to information leakage via incorrect ReferenceGrant handling
CVE-2023-34242

5.3MEDIUM

Key Information:

Vendor

cilium

Status
cilium
Vendor
CVE Published:
15 June 2023

What is CVE-2023-34242?

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.

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Affected Version(s)

cilium < 1.13.4

References

https://github.com/cilium/cilium/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/cilium/cilium/releases/tag/v1.13.4
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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