PsiTransfer: Upload PATCH path traversal can create `config.<NODE_ENV>.js` and lead to code execution on restart

PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, the upload PATCH flow under `/files/:uploadId` validates the mounted request path using the still-encoded `req.path`, but the downstream tus handler later writes using the decoded `req.params.uploadId`. In deployments that use a supported custom `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config.<NODE_ENV>.js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.

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

对路径名的限制不恰当(路径遍历)

PsiTransfer 路径遍历漏洞

PsiTransfer是Christoph Wiechert个人开发者的一个简单的开源自托管文件共享解决方案。 PsiTransfer 2.4.3之前版本存在路径遍历漏洞，该漏洞源于上传PATCH流程验证已编码的请求路径但下游tus处理器使用解码后的参数，可能导致路径遍历和任意代码执行。

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