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CVE-2023-39347— Cilium NetworkPolicy bypass via pod labels

Quick assessment

Affected
cilium cilium
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cilium是一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium存在数据伪造问题漏洞，该漏洞源于允许Kubernetes用户更新Pod标签来绕过网络策略。受影响的产品和版本：Cilium 1.13.6及之前版本，1.14.1及之前版本，1.12.13及之前版本。

CVSS 7.6 · High EPSS 0.50% · P41
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I. Basic Information for CVE-2023-39347

Vulnerability Information
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Vulnerability Title
Cilium NetworkPolicy bypass via pod labels
Source: CVE Program / CVE List V5
Vulnerability Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An attacker with the ability to update pod labels can cause Cilium to apply incorrect network policies. This issue arises due to the fact that on pod update, Cilium incorrectly uses user-provided pod labels to select the policies which apply to the workload in question. This can affect Cilium network policies that use the namespace, service account or cluster constructs to restrict traffic, Cilium clusterwide network policies that use Cilium namespace labels to select the Pod and Kubernetes network policies. Non-existent construct names can be provided, which bypass all network policies applicable to the construct. For example, providing a pod with a non-existent namespace as the value of the `io.kubernetes.pod.namespace` label results in none of the namespaced CiliumNetworkPolicies applying to the pod in question. This attack requires the attacker to have Kubernetes API Server access, as described in the Cilium Threat Model. This issue has been resolved in: Cilium versions 1.14.2, 1.13.7, and 1.12.14. Users are advised to upgrade. As a workaround an admission webhook can be used to prevent pod label updates to the `k8s:io.kubernetes.pod.namespace` and `io.cilium.k8s.policy.*` keys.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是一个开源软件。用于提供和透明地保护应用程序工作负载（如应用程序容器或进程）之间的网络连接和负载平衡。 Cilium存在数据伪造问题漏洞，该漏洞源于允许Kubernetes用户更新Pod标签来绕过网络策略。受影响的产品和版本：Cilium 1.13.6及之前版本，1.14.1及之前版本，1.12.13及之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cilium cilium >= 1.14.0, < 1.14.2 -

II. Public POCs for CVE-2023-39347

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III. Intelligence Information for CVE-2023-39347

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Vendor Advisories for CVE-2023-39347 (1)

Other References for CVE-2023-39347 (1)

Same Patch Batch · cilium · 2023-09-26 · 3 CVEs total

CVE-2023-41333 6.9 MEDIUM Bypass of namespace restrictions in CiliumNetworkPolicy
CVE-2023-41332 3.5 LOW Denial of service via Kubernetes annotations in specific Cilium configurations

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-345

V. Comments for CVE-2023-39347

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