CVE-2021-41134: Stored XSS in Jupyter nbdime

Q: What is CVE-2021-41134?

CVE-2021-41134 is a stored cross-site scripting (XSS) vulnerability in the Jupyter Nbdime project.

Q: Which versions of nbdime are affected by CVE-2021-41134?

Versions 1.0.0 to 1.1.1, 2.0.0 to 2.1.1, 3.0.0 to 3.1.1 of nbdime are affected by CVE-2021-41134.

Q: How severe is CVE-2021-41134?

CVE-2021-41134 has a severity score of 5.4 (high).

Q: How do I fix CVE-2021-41134?

To fix CVE-2021-41134, upgrade to a version of nbdime that is not affected by the vulnerability.

Q: Where can I find more information about CVE-2021-41134?

You can find more information about CVE-2021-41134 in the Jupyter Nbdime project's GitHub repository and security advisories.

Published Nov 3, 2021

Updated

Impact

Improper handling of user controlled input caused a stored cross-site scripting (XSS) vulnerability. All previous versions of nbdime are affected.

Patches

Security patches will be released for each of the major versions of the nbdime packages since version 1.x of the nbdime python package.

Python - nbdime 1.x: Patched in v. 1.1.1 - nbdime 2.x: Patched in v. 2.1.1 - nbdime 3.x: Patched in v. 3.1.1

npm - nbdime 6.x version: Patched in 6.1.2 - nbdime 5.x version: Patched in 5.0.2 - nbdime-jupyterlab 1.x version: Patched in 1.0.1 - nbdime-jupyterlab 2.x version: Patched in 2.1.1

For more information If you have any questions or comments about this advisory email us at security@ipython.org.

Other sources

nbdime provides tools for diffing and merging of Jupyter Notebooks. In affected versions a stored cross-site scripting (XSS) issue exists within the Jupyter-owned nbdime project. It appears that when reading the file name and path from disk, the extension does not sanitize the string it constructs before returning it to be displayed. The diffNotebookCheckpoint function within nbdime causes this issue. When attempting to display the name of the local notebook (diffNotebookCheckpoint), nbdime appears to simply append .ipynb to the name of the input file. The NbdimeWidget is then created, and the base string is passed through to the request API function. From there, the frontend simply renders the HTML tag and anything along with it. Users are advised to patch to the most recent version of the affected product.

— MITRE

Affected Software

14 affected componentsFixes available

npm/nbdime-jupyterlab>=2.0.0<2.1.1

2.1.1

npm/nbdime-jupyterlab<1.0.1

1.0.1

npm/nbdime>=6.0.0<6.1.2

6.1.2

npm/nbdime<5.0.2

5.0.2

pip/nbdime>=3.0.0<3.1.1

3.1.1

pip/nbdime>=2.0.0<2.1.1

2.1.1

pip/nbdime<1.1.1

1.1.1

jupyter nbdime python>=1.0.0<1.1.1

jupyter nbdime python>=2.0.0<2.1.1

jupyter nbdime python>=3.0.0<=3.1.1

jupyter Nbdime Node.js>=5.0.0<5.0.2

jupyter Nbdime Node.js>=6.0.0<6.1.2

jupyter Nbdime-jupyterlab Node.js>=1.0.0<1.0.1

jupyter Nbdime-jupyterlab Node.js>=2.0.0<2.1.1

Remediation

Patch Available

https://github.com/jupyter/nbdime/commit/e44a5cc7677f24b45ebafc756db49058c2f750ea

Event History

Nov 3, 2021

CVE Published

via MITRE·05:50 PM

Data Sourced

via MITRE·05:50 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·06:15 PM

RemedyDescriptionSeverityWeaknessAffected Software

Nov 8, 2021

Advisory Published

via GitHub·06:09 PM

Frequently Asked Questions

What is CVE-2021-41134?

CVE-2021-41134 is a stored cross-site scripting (XSS) vulnerability in the Jupyter Nbdime project.

Which versions of nbdime are affected by CVE-2021-41134?

Versions 1.0.0 to 1.1.1, 2.0.0 to 2.1.1, 3.0.0 to 3.1.1 of nbdime are affected by CVE-2021-41134.

How severe is CVE-2021-41134?