CVE-2021-23383 (published 2021-05-04T09:15Z)

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 v2 base score: 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS v3 base score: 9.8, CRITICAL (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-1321
cwe_name: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
description: 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.
extended_description: 
				By adding or modifying attributes of an object prototype, it is possible to create attributes that exist on every object, or replace critical attributes with malicious ones. This can be problematic if the product depends on existence or non-existence of certain attributes, or uses pre-defined attributes of object prototype (such as hasOwnProperty, toString or valueOf).
				This weakness is usually exploited by using a special attribute of objects called proto,  constructor or prototype. Such attributes give access to the object prototype. This weakness is often found in code that assigns object attributes based on user input, or merges or clones objects recursively.
			
			

Fix information:
repo_url: https://github.com/handlebars-lang/handlebars.js
commit_details: repo_url: https://github.com/handlebars-lang/handlebars.js
author: Nils Knappmeier
author_date: 2021-02-13 13:40:53+01:00
msg: fix: escape property names in compat mode (#1736)
repository: repo_url: https://github.com/handlebars-lang/handlebars.js
repo_name: handlebars-lang/handlebars.js
description: Minimal templating on steroids.
repo_language: JavaScript
owner: handlebars-lang
file_changes: filename: javascript-compiler.js
change_type: ModificationType.MODIFY
diff: @@ -16,7 +16,12 @@ JavaScriptCompiler.prototype = {
     return this.internalNameLookup(parent, name);
   },
   depthedLookup: function(name) {
-    return [this.aliasable('container.lookup'), '(depths, "', name, '")'];
+    return [
+      this.aliasable('container.lookup'),
+      '(depths, ',
+      JSON.stringify(name),
+      ')'
+    ];
   },
 
   compilerInfo: function() {

programming_language: JavaScript
filename: package-lock.json
change_type: ModificationType.MODIFY
diff: @@ -1,6 +1,6 @@
 {
   "name": "handlebars",
-  "version": "4.7.5",
+  "version": "4.7.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2826,7 +2826,7 @@
         "request": "^2.88.0",
         "strip-json-comments": "^2.0.1",
         "tslint": "^5.14.0",
-        "typescript": "^3.9.0-dev.20200402"
+        "typescript": "^4.3.0-dev.20210213"
       },
       "dependencies": {
         "fs-extra": {
@@ -2841,9 +2841,9 @@
           }
         },
         "typescript": {
-          "version": "3.9.0-dev.20200402",
-          "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.0-dev.20200402.tgz",
-          "integrity": "sha512-CxOOy4lmaPnuyG34aP1kF2l++aou/IM+T0XsEeXZWb6xbIwx+3rt1DbLNS0pQIsLxi7NITq3x4M1qXhOQOAE6A==",
+          "version": "4.3.0-dev.20210213",
+          "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.0-dev.20210213.tgz",
+          "integrity": "sha512-zJG5QIkviTzzYRmKylVXIG2YTV7P18rKLclZu67WypYhsPtaC3KSDD5mOiXJsurDw5rqTqN/OgjQ37cpc11P3A==",
           "dev": true
         }
       }
@@ -3904,628 +3904,14 @@
       "dev": true
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-          "dev": true,
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-          "dev": true,
-          "optional": true
-        }
+        "nan": "^2.12.1"
       }
     },
     "functional-red-black-tree": {
@@ -7636,9 +7022,9 @@
       "dev": true
     },
     "nan": {
-      "version": "2.14.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
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+      "version": "2.14.2",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.2.tgz",
+      "integrity": "sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==",
       "dev": true,
       "optional": true
     },
@@ -7821,9 +7207,6 @@
       "dev": true,
       "requires": {
         "underscore": ">= 1.1.5"
-      },
-      "dependencies": {
-        "browserify": {}
       }
     },
     "nopt": {

programming_language: JavaScript
filename: security.js
change_type: ModificationType.MODIFY
diff: @@ -396,6 +396,28 @@ describe('security issues', function() {
       });
     });
   });
+
+  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');
+    });
+  });
 });
 
 function wrapToAdjustContainer(precompiledTemplateFunction) {

programming_language: JavaScript