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CVE-2023-41333— Bypass of namespace restrictions in CiliumNetworkPolicy

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存在访问控制错误漏洞，该漏洞源于允许攻击者绕过CiliumNetworkPolicy中的命名空间限制。受影响的产品和版本：Cilium 1.14.1及之前版本，1.12.13及之前版本，1.13.6及之前版本。

CVSS 6.9 · Medium EPSS 0.48% · P40
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I. Basic Information for CVE-2023-41333

Vulnerability Information
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Vulnerability Title
Bypass of namespace restrictions in CiliumNetworkPolicy
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 create or modify CiliumNetworkPolicy objects in a particular namespace is able to affect traffic on an entire Cilium cluster, potentially bypassing policy enforcement in other namespaces. By using a crafted `endpointSelector` that uses the `DoesNotExist` operator on the `reserved:init` label, the attacker can create policies that bypass namespace restrictions and affect the entire Cilium cluster. This includes potentially allowing or denying all traffic. This attack requires API server access, as described in the Kubernetes API Server Attacker section of the Cilium Threat Model. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. As a workaround an admission webhook can be used to prevent the use of `endpointSelectors` that use the `DoesNotExist` operator on the `reserved:init` label in CiliumNetworkPolicies.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 访问控制错误漏洞
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存在访问控制错误漏洞，该漏洞源于允许攻击者绕过CiliumNetworkPolicy中的命名空间限制。受影响的产品和版本：Cilium 1.14.1及之前版本，1.12.13及之前版本，1.13.6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-2023-41333

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III. Intelligence Information for CVE-2023-41333

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Patches & Fixes for CVE-2023-41333 (1)

Vendor Advisories for CVE-2023-41333 (1)

Other References for CVE-2023-41333 (1)

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

CVE-2023-39347 7.6 HIGH Cilium NetworkPolicy bypass via pod labels
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-306

V. Comments for CVE-2023-41333

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