Description (CNA)
Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `Handlebars.compile()` accepts a pre-parsed AST object in addition to a template string. The `value` field of a `NumberLiteral` AST node is emitted directly into the generated JavaScript without quoting or sanitization. An attacker who can supply a crafted AST to `compile()` can therefore inject and execute arbitrary JavaScript, leading to Remote Code Execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. Validate input type before calling `Handlebars.compile()`; ensure the argument is always a `string`, never a plain object or JSON-deserialized value. Use the Handlebars runtime-only build (`handlebars/runtime`) on the server if templates are pre-compiled at build time; `compile()` will be unavailable.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| handlebars-lang / handlebars.js | affected >= 4.0.0, < 4.7.9 |
CWE
CWE-843, CWE-94
References
- https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2w6w-674q-4c4q
- https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
- https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in Handlebars. An attacker can exploit this by supplying a crafted Abstract Syntax Tree (AST) object to the `Handlebars.compile()` function. This allows the injection and execution of arbitrary JavaScript code due to improper sanitization of the `value` field in `NumberLiteral` AST nodes. This vulnerability can lead to Remote Code Execution (RCE) on the server.