[Security] Bump handlebars from 4.1.1 to 4.3.0

[dependabot-preview]

Bumps handlebars from 4.1.1 to 4.3.0. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

High severity vulnerability that affects handlebars Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's proto and defineGetter properties, which may allow an attacker to execute arbitrary code through crafted payloads.

Affected versions: < 4.3.0

Changelog

Sourced from handlebars's changelog.

v4.3.0 - September 24th, 2019

Fixes:

• Security: Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72
• Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72

Features:

• Add new runtime option allowCallsToHelperMissing to allow calling blockHelperMissing and helperMissing.

Breaking changes:

Compatibility notes:

• Compiler revision increased - 06b7224

  • This means that template compiled with versions prior to 4.3.0 will not work with runtimes >= 4.3.0 The increase was done because the "helperMissing" and "blockHelperMissing" are now moved from the helpers to the internal "container.hooks" object, so old templates will not be able to call them anymore. We suggest that you always recompile your templates with the latest compiler in your build pipelines.

• Disallow calling "helperMissing" and "blockHelperMissing" directly - 2078c72

  • Calling "helperMissing" and "blockHelperMissing" directly from a template (like in {{blockHelperMissing}} was never intended and was part of the exploits that have been revealed early in 2019 (see wycats/handlebars.js#1495). It is also part of a new exploit that is not captured by the earlier fix. In order to harden Handlebars against such exploits, calling thos helpers is now not possible anymore. Overriding those helpers is still possible.
  • If you really need this behavior, you can set the runtime option allowCallsToHelperMissing to true and the calls will again be possible

Both bullet points imly that Handlebars is not 100% percent compatible to 4.2.0, despite the minor version bump.

We consider it more important to resolve a major security issue than to maintain 100% compatibility.

Commits

v4.2.1 - September 20th, 2019

Bugfixes:

• The "browser" property in the package.json has been updated to use the common-js builds instead of the minified UMD - c55a7be, #1553

Compatibility notes:

• No compatibility issues should arise

Commits

v4.2.0 - September 3rd, 2019

Chore/Test:

• Use custom grunt-saucelab with current sauce-connect proxy - f119497
• Add framework for various integration tests - f9cce4d

... (truncated)

Commits

• a89081d v4.3.0
• bba6560 Update release notes
• 06b7224 adjust compiler revision
• 2078c72 Disallow calling "helperMissing" and "blockHelperMissing" directly
• fff3e40 v4.2.1
• 35bcd44 Update release notes
• 00b4f2f Fix some small typos.
• e47b5ec integration-tests for various webpack-scenarios
• c55a7be fix: use cjs for browser fields
• 164c7ce v4.2.0
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #153.