Sharp has Unrestricted File Upload via Client-Controlled Validation Rules

Sharp is a content management framework built for Laravel as a package. Versions prior to 9.20.0 contain a vulnerability in the file upload endpoint that allows authenticated users to bypass all file type restrictions. The upload endpoint within the `ApiFormUploadController` accepts a client-controlled `validation_rule` parameter. This parameter is directly passed into the Laravel validator without sufficient server-side enforcement. By intercepting the request and sending `validation_rule[]=file`, an attacker can completely bypass all MIME type and file extension restrictions. This issue has been addressed in version 9.20.0 by removing the client-controlled validation rules and strictly defining upload rules server-side. As a workaround, ensure that the storage disk used for Sharp uploads is strictly private. Under default configurations, an attacker cannot directly execute uploaded PHP files unless a public disk configuration is explicitly used.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

危险类型文件的不加限制上传

sharp 代码问题漏洞

sharp是lovell个人开发者的一款用于将常见格式的大图像转换为更小的、对 Web 友好的 JPEG、PNG、WebP、GIF 和不同尺寸的 AVIF 图像。 Sharp 9.20.0之前版本存在代码问题漏洞，该漏洞源于文件上传端点存在客户端控制的validation_rule参数，可能导致绕过所有文件类型限制。

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