Jupyter Server Proxy has a reflected XSS issue in host parameter

Jupyter Server Proxy allows users to run arbitrary external processes alongside their notebook server and provide authenticated web access to them. Versions of 3.x prior to 3.2.4 and 4.x prior to 4.2.0 have a reflected cross-site scripting (XSS) issue. The `/proxy` endpoint accepts a `host` path segment in the format `/proxy/<host>`. When this endpoint is called with an invalid `host` value, `jupyter-server-proxy` replies with a response that includes the value of `host`, without sanitization [2]. A third-party actor can leverage this by sending a phishing link with an invalid `host` value containing custom JavaScript to a user. When the user clicks this phishing link, the browser renders the response of `GET /proxy/<host>`, which runs the custom JavaScript contained in `host` set by the actor. As any arbitrary JavaScript can be run after the user clicks on a phishing link, this issue permits extensive access to the user's JupyterLab instance for an actor. Patches are included in versions 4.2.0 and 3.2.4. As a workaround, server operators who are unable to upgrade can disable the `jupyter-server-proxy` extension.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Jupyter Server Proxy 安全漏洞

Jupyter Server Proxy是JupyterHub开源的一个库，允许在笔记本服务器旁边运行任意外部进程。 Jupyter Server Proxy 3.2.4 之前、4.2.0 之前版本存在安全漏洞，该漏洞源于允许用户在其笔记本服务器运行任意外部进程，并为其提供经过身份验证的 Web 访问。

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