Subject: [ASA-202108-10] jupyterlab: cross-site scripting

Arch Linux Security Advisory ASA-202108-10
==========================================

Severity: High
Date    : 2021-08-10
CVE-ID  : CVE-2021-32797
Package : jupyterlab
Type    : cross-site scripting
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2266

Summary
=======

The package jupyterlab before version 3.1.4-1 is vulnerable to cross-
site scripting.

Resolution
==========

Upgrade to 3.1.4-1.

# pacman -Syu "jupyterlab>=3.1.4-1"

The problem has been fixed upstream in version 3.1.4.

Workaround
==========

None.

Description
===========

In JupyterLab before version 3.1.4, untrusted notebooks can execute
code on load. In particular JupyterLab doesn't sanitize the action
attribute of the HTML <form> element. Using this it is possible to
trigger the form validation outside of the form itself. This is a
remote code execution, but requires user action to open a notebook.

Impact
======

An attacker could perform remote code execution using a maliciously
crafted notebook file.

References
==========

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-4952-p58q-6crx
https://github.com/jupyterlab/jupyterlab/commit/504825938c0abfa2fb8ff8d529308830a5ae42ed
https://security.archlinux.org/CVE-2021-32797