GHSA-gj55-2xf9-67rq HTML injection in JupyterLite leading to DOM Clobbering

• PyPI jupyterlite-core: < 0.4.1 → fixed in 0.4.1

Impact The vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature. A malicious user can access any data accessible from JupyterLite and perform arbitrary actions in JupyterLite environment. Patches JupyterLite 0.4.1 was patched. Workarounds There is no workaround for the underlying DOM Clobbering susceptibility. However, select plugins can be disabled on deployments which cannot update in a timely fashion to minimise the risk. These are: • `@jupyterlab/mathjax-extension:plugin` - users will loose ability to preview mathematical equations • `@jupyterlab/markdownviewer-extension:plugin` - users will loose ability to open Markdown previews • `@jupyterlab/mathjax2-extension:plugin` (if installed with optional `jupyterlab-mathjax2` package) - an older version of the mathjax plugin for JupyterLab 4.x To disable these extensions populate the `disabledExtensions` key in `jupyter-config-data` stanza of `jupyter-lite.json` as documented on https://jupyterlite.readthedocs.io/en/stable/howto/configure/config_files.html#jupyter-lite-json ```json { "jupyter-lite-schema-version": 0, "jupyter-config-data": { "appName": "My JupyterLite App", "disabledExtensions": [ "@jupyterlab/markdownviewer-extension:plugin", "@jupyterlab/mathjax-extension:plugin", "@jupyterlab/mathjax2-extension:plugin" ] } } ``` To confirm that the plugins were disabled manual inspection of the built page is required. References Upstream advisory: https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-9q39-rmj3-p4r2 Notes This change has a potential to break rendering of some markdown. There is a setting in Sanitizer which allows to revert to the previous sanitizer settings (`allowNamedProperties`).