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Code Issues Actions 8 Packages Projects Releases Wiki Activity

Fixes #7788: Improve XSS mitigation in Markdown renderer

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This commit is contained in:
jeremystretch 2021-11-11 15:38:34 -05:00
parent 2f064cdfd1
commit a799094227
2 changed files with 8 additions and 2 deletions
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1
docs/release-notes/version-3.0.md
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@ -17,6 +17,7 @@
* [#7766](https://github.com/netbox-community/netbox/issues/7766) - Add missing outer dimension columns to rack table
* [#7780](https://github.com/netbox-community/netbox/issues/7780) - Preserve multi-line values during CSV file import
* [#7783](https://github.com/netbox-community/netbox/issues/7783) - Fix indentation of locations under site view
* [#7788](https://github.com/netbox-community/netbox/issues/7788) - Improve XSS mitigation in Markdown renderer
* [#7791](https://github.com/netbox-community/netbox/issues/7791) - Enable sorting device bays table by installed device status
* [#7802](https://github.com/netbox-community/netbox/issues/7802) - Differentiate ID and VID columns in VLANs table

9
netbox/utilities/templatetags/helpers.py
View File

@ -40,14 +40,19 @@ def render_markdown(value):
"""
Render text as Markdown
"""
schemes = '|'.join(settings.ALLOWED_URL_SCHEMES)
# Strip HTML tags
value = strip_tags(value)
# Sanitize Markdown links
schemes = '|'.join(settings.ALLOWED_URL_SCHEMES)
pattern = fr'\[(.+)\]\((?!({schemes})).*:(.+)\)'
pattern = fr'\[([^\]]+)\]\((?!({schemes})).*:(.+)\)'
value = re.sub(pattern, '[\\1](\\3)', value, flags=re.IGNORECASE)
# Sanitize Markdown reference links
pattern = fr'\[(.+)\]:\w?(?!({schemes})).*:(.+)'
value = re.sub(pattern, '[\\1]: \\3', value, flags=re.IGNORECASE)
# Render Markdown
html = markdown(value, extensions=['fenced_code', 'tables'])