CVE-2021-23383 (JavaScript, published 2021-05-04T09:15Z)
Description: value: The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to compile templates coming from an untrusted source.
Severity: HIGH (CVSS v3 base score: 9.8)
Weakness: CWE-1321 \u2014 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
Repository: https://github.com/handlebars-lang/handlebars.js
Files changed:
lib/handlebars/compiler/javascript-compiler.js
package-lock.json
spec/security.js
Commit message: fix: escape property names in compat mode (#1736)


Vulnerable code:
    return [this.aliasable('container.lookup'), '(depths, "', name, '")'];
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Fixed code:
    return [
      this.aliasable('container.lookup'),
      '(depths, ',
      JSON.stringify(name),
      ')'
    ];
  "version": "4.7.6",
        "typescript": "^4.3.0-dev.20210213"
          "version": "4.3.0-dev.20210213",
          "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.0-dev.20210213.tgz",
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      "version": "1.2.13",
      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
      "integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
        "nan": "^2.12.1"
      "version": "2.14.2",
      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.2.tgz",
      "integrity": "sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==",

  describe('escapes template variables', function() {
    it('in compat mode', function() {
      expectTemplate("{{'a\\b'}}")
        .withCompileOptions({ compat: true })
        .withInput({ 'a\\b': 'c' })
        .toCompileTo('c');
    });

    it('in default mode', function() {
      expectTemplate("{{'a\\b'}}")
        .withCompileOptions()
        .withInput({ 'a\\b': 'c' })
        .toCompileTo('c');
    });
    it('in default mode', function() {
      expectTemplate("{{'a\\b'}}")
        .withCompileOptions({ strict: true })
        .withInput({ 'a\\b': 'c' })
        .toCompileTo('c');
    });
  });