Kubernetes kubelet API

[Y M via Snort-sigs <snort-sigs () lists snort org>]

Hi,

The first rule addresses the unauthenticated read-only HTTP access potentially disclosing sensitive information about 
pods. The second rule address the remote execution attempts over the HTTPS read/write port. No pcaps available.

# --------------------
# Date: 2018-05-06
# Title: Analysis of a Kubernetes hack — Backdooring through kubelet
# Reference: https://medium.com/handy-tech/analysis-of-a-kubernetes-hack-backdooring-through-kubelet-823be5c3d67c
# Tests: syntax only

alert tcp $EXTERNAL_NET any -> $HOME_NET [10250,10255] (msg:"SERVER-OTHER Kubernetes kubelet API read-only pods 
information access attempt"; flow:to_server,established; content:"GET"; http_method; content:"/pods"; 
fast_pattern:only; http_uri; 
reference:url,medium.com/handy-tech/analysis-of-a-kubernetes-hack-backdooring-through-kubelet-823be5c3d67c; 
classtype:attempted-admin; sid:8000039; rev:1;)

alert tcp $EXTERNAL_NET any -> $HOME_NET [10250,10255] (msg:"SERVER-OTHER Kubernetes kubelet API pod remote execution 
attempt"; flow:to_server,established; content:"POST"; http_method; content:"/exec/"; fast_pattern:only; http_uri; 
content:"?command="; http_uri; 
reference:url,medium.com/handy-tech/analysis-of-a-kubernetes-hack-backdooring-through-kubelet-823be5c3d67c; 
classtype:attempted-admin; sid:8000040; rev:1;)

Thanks.
YM

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