Cross-site Scripting in Goto Anything allows arbitrary code execution in Joplin

Vulnerability Description

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. This vulnerability is caused by adding note titles to the document using React's `dangerouslySetInnerHTML`, without first escaping HTML entities. Joplin lacks a Content-Security-Policy with a restrictive `script-src`. This allows arbitrary JavaScript execution via inline `onclick`/`onload` event handlers in unsanitized HTML. Additionally, Joplin's main window is created with `nodeIntegration` set to `true`, allowing arbitrary JavaScript execution to result in arbitrary code execution. Anyone who 1) receives notes from unknown sources and 2) uses <kbd>ctrl</kbd>-<kbd>p</kbd> to search is impacted. This issue has been addressed in version 3.1.24 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

References

• https://github.com/laurent22/joplin/security/advisories/GHSA-9gfv-q6wj-fr3c
• https://github.com/laurent22/joplin/commit/360ece6f8873ef81afbfb98b25faad696ffccdb6
• https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src
• https://github.com/laurent22/joplin/blob/2fc9bd476b0d9abcddb0a46f615a48333779d225/packages/app-desktop/plugins/GotoAnything.tsx#L558