Cilium NetworkPolicy bypass via pod labels
CVE-2023-39347

7.6HIGH

Key Information:

Vendor

Cilium

Status
Cilium
Vendor
CVE Published:
27 September 2023

What is CVE-2023-39347?

Cilium, a networking and security solution for Kubernetes, is vulnerable to improper label handling that can lead to the application of incorrect network policies. An attacker with the ability to update pod labels may manipulate these labels to bypass network restrictions. This manipulation occurs when Cilium incorrectly selects network policies based on user-provided labels during pod updates. Specifically, if an attacker supplies a non-existent namespace label, the associated CiliumNetworkPolicies fail to apply, thereby elevating the risk of unauthorized access to network resources. To mitigate this risk, users are encouraged to upgrade to the latest versions of Cilium, where this issue has been resolved.

Affected Version(s)

cilium >= 1.14.0, < 1.14.2 < 1.14.0, 1.14.2

cilium >= 1.13.0, < 1.13.7 < 1.13.0, 1.13.7

cilium < 1.12.14 < 1.12.14

References

https://github.com/cilium/cilium/security/advisories/GHSA...
x_refsource_CONFIRM
https://docs.cilium.io/en/latest/security/threat-model/#k...
x_refsource_MISC

CVSS V3.1

Score:
7.6
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2023-39347 : Cilium NetworkPolicy bypass via pod labels