chore(deps): bump github.com/microcosm-cc/bluemonday from 1.0.9 to 1.0.21

[dependabot[bot]]

Bumps github.com/microcosm-cc/bluemonday from 1.0.9 to 1.0.21.

Release notes

Sourced from github.com/microcosm-cc/bluemonday's releases.

Very minor bug fix to remove empty elements without attributes

Thanks to @​Gusted for microcosm-cc/bluemonday#151 which fixes a bug that allowed a policy to be defined in a way that input could've allowed an empty and meaningless element to be left in the output when it should not have done so.

This is not a security issue, and the details can be seen in the PR comment.

Updated x/net/html

This is an update of dependencies, specifically it updates the HTML parser within go/net/html.

The update removes a capability, Microsoft style comments that allow browser conditionals no longer works. This is due to a fix on the part of the Go team to prevent XSS within HTML comments, and the commit in question is here https://github.com/golang/net/commit/06994584 . There is no easy to see safe way to restore that functionality without adding more risk to those who .AllowComments() and so I am accepting that this non-standard use of HTML comments is no longer supported.

As part of this version, the older release of v1.0.19 is retracted.

Add SVG inline images, improve RGB color and length matching, fix bug

What's Changed

• css: improve RGB hex color and length matching by @​hochhaus in microcosm-cc/bluemonday#142
• css: add support for image/svg+xml for data-uri inline images
• html: fix double-escaping of content within HTML attributes
• tests: added more tests to provide examples of proofs of some open issues

New Contributors

• @​hochhaus made their first contribution in microcosm-cc/bluemonday#142

Full Changelog: https://github.com/microcosm-cc/bluemonday/compare/v1.0.18...v1.0.19

Fix bug in iframe sandboxvalues

What's Changed

• Fix incorrect handling of iframe SandboxValues by @​kiwiz in microcosm-cc/bluemonday#138

Full Changelog: https://github.com/microcosm-cc/bluemonday/compare/v1.0.17...v1.0.18

Add support for the "sandbox" attribute on the "iframe" element

As per microcosm-cc/bluemonday#135 @​kiwiz has added support to bluemonday that allows the iframe element to correctly declare the security attribute sandbox.

You can read about that attribute here: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#attr-sandbox

No other change is in this release.

Prevent a HTML sanitization vulnerability

CVE-2021-42576

A vulnerability was discovered by https://github.com/TomAnthony https://www.tomanthony.co.uk/ which allowed the contents of a style tag to be leaked unsanitized by bluemonday into the HTML output. Further it was demonstrated that if the form elements select and option were allowed by the policy that this could result in a successful XSS.

You would only be vulnerable to if if you allowed style, select and option in your HTML sanitization policy:

p := bluemonday.NewPolicy()
p.AllowElements("style","select")
html := p.Sanitize(`<select><option><style><script>alert(1)</script>`)
fmt.Println(html)

... (truncated)

Commits

• 1ee3c12 go mod && go fmt: update dependencies and format code
• 07c5693 Merge pull request #151 from Gusted/self-closing-tag-bug
• cc9997e Don't write self-closing tag with empty attributes
• 705c34a Updated x/net/html to ensure latest version from the Go team, retracted v1.0....
• 84409dd Only test n-1 Go versions
• 8fc9802 Merge branch 'main' of github.com:microcosm-cc/bluemonday into main
• c66f9ff Updated Go version, retract old versions of this package which are always con...
• a232bac Removed outdated build badge
• 97a5b1f Test recent Go versions
• 9ec48cf Test recent Go versions
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #167 (c0ccdea) into master (cf61161) will decrease coverage by 0.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   15.44%   15.38%   -0.06%     
==========================================
  Files          24       24              
  Lines        1716     1716              
==========================================
- Hits          265      264       -1     
- Misses       1400     1401       +1     
  Partials       51       51              

Flag	Coverage Δ
unittests	15.38% <ø> (-0.06%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/sgtm/http_server.go	66.39% <0.00%> (-0.41%)	:arrow_down:

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[dependabot[bot]]

Superseded by #200.