[Security] Bump bleach from 3.1.1 to 3.1.2

[dependabot-preview]

Bumps bleach from 3.1.1 to 3.1.2. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects bleach

Impact

A mutation XSS affects users calling bleach.clean with all of:

• the svg or math in the allowed/whitelisted tags
• an RCDATA tag (see below) in the allowed/whitelisted tags
• the keyword argument strip=False

Patches

Users are encouraged to upgrade to bleach v3.1.2 or greater.

Workarounds

• modify bleach.clean calls to use strip=True, or not whitelist math or svg tags and one or more of the following tags:

script
noscript
style
</tr></table> ... (truncated)
Affected versions: < 3.1.2

Changelog

Sourced from bleach's changelog.

Version 3.1.2 (March 11th, 2020)

Security fixes

• bleach.clean behavior parsing embedded MathML and SVG content with RCDATA tags did not match browser behavior and could result in a mutation XSS.

  Calls to bleach.clean with strip=False and math or svg tags and one or more of the RCDATA tags script, noscript, style, noframes, iframe, noembed, or xmp in the allowed tags whitelist were vulnerable to a mutation XSS.

  This security issue was confirmed in Bleach version v3.1.1. Earlier versions are likely affected too.

  Anyone using Bleach <=v3.1.1 is encouraged to upgrade.

  https://bugzilla.mozilla.org/show_bug.cgi?id=1621692

Backwards incompatible changes

None

Features

None

Bug fixes

None

Commits

• 78a0672 Update for v3.1.2 release
• 7b625ff add wheel to requirements-dev
• e4e9e21 fix bug 1621692
• See full diff in compare view

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