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Cross-Site Scripting (XSS) vulnerability in JSON, Markdown and iPython Notebook previewers

lnielsen published GHSA-j9m2-6hq2-4r3c Jul 15, 2019
@lnielsen

lnielsen published Jul 15, 2019

moderate severity
Affected versions: <1.0.0a12
Patched versions: 1.0.0a12
Package: invenio-previewer
Package ecosystem: PyPI

Impact

Several Cross-Site Scripting (XSS) vulnerabilities have been found in the JSON, Markdown and iPython Notebook previewers. The vulnerabilities would allow a malicous user to upload a JSON, Markdown or Notebook file with embedded scripts that would be executed by a victims browser.

Patches

Invenio-Previewer v1.0.0a12 fixes the issue.

Workarounds

You can remediate the vulnerability without upgrading by disabling the affected previewers. You do this by adding the following to your configuration:

PREVIEWER_PREFERENCE = [
    'csv_dthreejs',
    'simple_image',
    # 'json_prismjs',
    'xml_prismjs',
    # 'mistune',
    'pdfjs',
    # 'ipynb',
    'zip',
]

Afterwards, you should not be able to preview JSON, Markdown or iPython Notebook files.

For more information

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