中危 通过 pod 标签绕过 Cilium NetworkPolicy (CVE-2023-39347)

CVE编号

CVE-2023-39347

利用情况

暂无

补丁情况

官方补丁

披露时间

2023-07-28

漏洞描述

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.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://docs.cilium.io/en/latest/security/threat-model/#kubernetes-api-server...
https://github.com/cilium/cilium/security/advisories/GHSA-gj2r-phwg-6rww

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	cilium	cilium	*		Up to (excluding) 1.12.14
	运行在以下环境
	应用	cilium	cilium	*	From (including) 1.13.0	Up to (excluding) 1.13.7
	运行在以下环境
	应用	cilium	cilium	*	From (including) 1.14.0	Up to (excluding) 1.14.2

阿里云评分 5.9

• 攻击路径 远程
• 攻击复杂度 容易
• 权限要求 无需权限
• 影响范围 全局影响
• EXP成熟度 未验证
• 补丁情况 官方补丁
• 数据保密性 无影响
• 数据完整性 无影响
• 服务器危害 无影响
• 全网数量 N/A

CWE-ID	漏洞类型
CWE-345	对数据真实性的验证不充分

Exp相关链接

- avd.aliyun.com