LocalSend path traversal vulnerability in the file upload endpoint allows nearby devices to execute arbitrary commands

LocalSend is a free, open-source app that allows users to securely share files and messages with nearby devices over their local network without needing an internet connection. Prior to version 1.17.0, due to the missing sanitization of the path in the `POST /api/localsend/v2/prepare-upload` and the `POST /api/localsend/v2/upload` endpoint, a malicious file transfer request can write files to the arbitrary location on the system, resulting in the remote command execution. A malicious file transfer request sent by nearby devices can write files into an arbitrary directory. This usually allows command execution via the startup folder on Windows or Bash-related files on Linux. If the user enables the `Quick Save` feature, it will silently write files without explicit user interaction. Version 1.17.0 fixes this issue.

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对路径名的限制不恰当(路径遍历)

LocalSend 路径遍历漏洞

LocalSend是LocalSend开源的一个 AirDrop 的开源跨平台替代方案。 LocalSend 1.17.0之前版本存在路径遍历漏洞，该漏洞源于路径清理不足。攻击者利用该漏洞可以远程执行命令。

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