From 2c738f5c52cfb384b43d977a56a3ab7ce465df9b Mon Sep 17 00:00:00 2001
From: Takayuki Sato <sttk.xslet@gmail.com>
Date: Thu, 18 Mar 2021 22:03:00 +0900
Subject: [PATCH] Fix: Avoids prototype pollution (#7)

---
 .eslintrc                   |  27 +---------
 index.js                    |   8 +++
 package.json                |   1 +
 test/copy-props-proc.js     | 102 ++++++++++++++++++++++++++++++++++++
 test/web/copy-props-proc.js | 102 ++++++++++++++++++++++++++++++++++++
 web/copy-props.js           |   8 +++
 web/copy-props.min.js       |   2 +-
 web/copy-props.min.js.map   |   2 +-
 8 files changed, 225 insertions(+), 27 deletions(-)

diff --git a/.eslintrc b/.eslintrc
index 8880395..76e7721 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,29 +1,6 @@
 {
-  "env": {
-    "node": true
-  },
+  "extends": "gulp",
   "rules": {
-    "array-bracket-spacing": [2, "never"],
-    "block-scoped-var": 2,
-    "brace-style": [2, "1tbs"],
-    "camelcase": 1,
-    "computed-property-spacing": [2, "never"],
-    "curly": 2,
-    "eol-last": 2,
-    "eqeqeq": [2, "smart"],
-    "max-depth": [1, 3],
-    "max-len": [1, 80],
-    "max-statements": [1, 40],
-    "new-cap": 1,
-    "no-extend-native": 2,
-    "no-mixed-spaces-and-tabs": 2,
-    "no-trailing-spaces": 2,
-    "no-unused-vars": 1,
-    "no-use-before-define": [2, "nofunc"],
-    "object-curly-spacing": [2, "always"],
-    "quotes": [2, "single", "avoid-escape"],
-    "semi": [2, "always"],
-    "keyword-spacing": [2, { "before": true, "after": true }],
-    "space-unary-ops": 2
+    "max-statements": 0
   }
 }
diff --git a/index.js b/index.js
index 37bdfdc..994807e 100644
--- a/index.js
+++ b/index.js
@@ -184,6 +184,10 @@ function setDeep(obj, keyChain, valueCreator) {
 
 function _setDeep(obj, keyElems, depth, valueCreator) {
   var key = keyElems.shift();
+  if (isPossibilityOfPrototypePollution(key)) {
+    return;
+  }
+
   if (!keyElems.length) {
     var value = valueCreator(obj, key, depth);
     if (value === undefined) {
@@ -224,3 +228,7 @@ function newUndefined() {
 function isObject(v) {
   return Object.prototype.toString.call(v) === '[object Object]';
 }
+
+function isPossibilityOfPrototypePollution(key) {
+  return (key === '__proto__' || key === 'constructor');
+}
diff --git a/package.json b/package.json
index 85bd124..46848b9 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "chai": "^3.5.0",
     "coveralls": "^3.1.0",
     "eslint": "^7.9.0",
+    "eslint-config-gulp": "^5.0.1",
     "mocha": "^3.5.3",
     "nyc": "^15.1.0",
     "uglify-js": "^3.10.4"
diff --git a/test/copy-props-proc.js b/test/copy-props-proc.js
index 039dc2e..be9a231 100644
--- a/test/copy-props-proc.js
+++ b/test/copy-props-proc.js
@@ -701,4 +701,106 @@ describe('Processing', function() {
 
   });
 
+  describe('Avoid a prototype pollution vulnerability', function() {
+
+    describe('The critical property key is in a src object', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var maliciousSrcJson = '{"__proto__":{"polluted":"polluted"},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse(maliciousSrcJson), {})).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype', function(done) {
+        var maliciousSrcJson = '{"constructor":{"prototype":{"polluted":"polluted"}},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse(maliciousSrcJson), {})).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property key is in a dest object and using reverse', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var maliciousSrcJson = '{"__proto__":{"polluted":"polluted"},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, JSON.parse(maliciousSrcJson), true)).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype', function(done) {
+        var maliciousSrcJson = '{"constructor":{"prototype":{"polluted":"polluted"}},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, JSON.parse(maliciousSrcJson), true)).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property value is in a fromto object', function() {
+
+      it('should ignore a property value: __proto__', function(done) {
+        var fromto = { a: '__proto__.poluuted', b: 'c' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({ a: 'polluted', b: 1 }, {}, fromto)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property value: constructor.prototype', function(done) {
+        var fromto = { a: 'constructor.prototype.polluted', b: 'c' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({ a: 'polluted', b: 1 }, {}, fromto)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property key is in a fromto object and using reverse', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var fromto = { '__proto__.poluuted': 'a', c: 'b' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, { a: 'polluted', b: 1 }, fromto, true)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype and using reverse', function(done) {
+        var fromto = { 'constructor.prototype.polluted': 'a', c: 'b' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, { a: 'polluted', b: 1 }, fromto, true)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical element is in a fromto array', function() {
+
+      it('should ignore an element: __proto__', function(done) {
+        var fromto = ['__proto__.polluted', 'b'];
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse('{"__proto__":{"polluted":"polluted"},"b":1}'), {}, fromto)).to.deep.equal({ b: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore an element: constructor.prototype', function(done) {
+        var fromto = ['constructor.prototype.polluted', 'b'];
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse('{"constructor":{"prototype":{"polluted":"polluted"}},"b":1}'), {}, fromto)).to.deep.equal({ b: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+  });
 });
diff --git a/test/web/copy-props-proc.js b/test/web/copy-props-proc.js
index 40d4585..815e42f 100644
--- a/test/web/copy-props-proc.js
+++ b/test/web/copy-props-proc.js
@@ -701,4 +701,106 @@ describe('Processing', function() {
 
   });
 
+  describe('Avoid a prototype pollution vulnerability', function() {
+
+    describe('The critical property key is in a src object', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var maliciousSrcJson = '{"__proto__":{"polluted":"polluted"},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse(maliciousSrcJson), {})).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype', function(done) {
+        var maliciousSrcJson = '{"constructor":{"prototype":{"polluted":"polluted"}},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse(maliciousSrcJson), {})).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property key is in a dest object and using reverse', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var maliciousSrcJson = '{"__proto__":{"polluted":"polluted"},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, JSON.parse(maliciousSrcJson), true)).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype', function(done) {
+        var maliciousSrcJson = '{"constructor":{"prototype":{"polluted":"polluted"}},"a":1}';
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, JSON.parse(maliciousSrcJson), true)).to.deep.equal({ a: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property value is in a fromto object', function() {
+
+      it('should ignore a property value: __proto__', function(done) {
+        var fromto = { a: '__proto__.poluuted', b: 'c' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({ a: 'polluted', b: 1 }, {}, fromto)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property value: constructor.prototype', function(done) {
+        var fromto = { a: 'constructor.prototype.polluted', b: 'c' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({ a: 'polluted', b: 1 }, {}, fromto)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical property key is in a fromto object and using reverse', function() {
+
+      it('should ignore a property key: __proto__', function(done) {
+        var fromto = { '__proto__.poluuted': 'a', c: 'b' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, { a: 'polluted', b: 1 }, fromto, true)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore a property key: constructor.prototype and using reverse', function(done) {
+        var fromto = { 'constructor.prototype.polluted': 'a', c: 'b' };
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps({}, { a: 'polluted', b: 1 }, fromto, true)).to.deep.equal({ c: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+
+    describe('The critical element is in a fromto array', function() {
+
+      it('should ignore an element: __proto__', function(done) {
+        var fromto = ['__proto__.polluted', 'b'];
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse('{"__proto__":{"polluted":"polluted"},"b":1}'), {}, fromto)).to.deep.equal({ b: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+      it('should ignore an element: constructor.prototype', function(done) {
+        var fromto = ['constructor.prototype.polluted', 'b'];
+        expect({}.polluted).to.be.undefined;
+        expect(copyProps(JSON.parse('{"constructor":{"prototype":{"polluted":"polluted"}},"b":1}'), {}, fromto)).to.deep.equal({ b: 1 });
+        expect({}.polluted).to.be.undefined;
+        done();
+      });
+
+    });
+  });
 });
diff --git a/web/copy-props.js b/web/copy-props.js
index 9dd95df..31337a3 100644
--- a/web/copy-props.js
+++ b/web/copy-props.js
@@ -185,6 +185,10 @@ function setDeep(obj, keyChain, valueCreator) {
 
 function _setDeep(obj, keyElems, depth, valueCreator) {
   var key = keyElems.shift();
+  if (isPossibilityOfPrototypePollution(key)) {
+    return;
+  }
+
   if (!keyElems.length) {
     var value = valueCreator(obj, key, depth);
     if (value === undefined) {
@@ -226,6 +230,10 @@ function isObject(v) {
   return Object.prototype.toString.call(v) === '[object Object]';
 }
 
+function isPossibilityOfPrototypePollution(key) {
+  return (key === '__proto__' || key === 'constructor');
+}
+
 },{"each-props":4,"is-plain-object":8}],2:[function(require,module,exports){
 /*!
  * array-each <https://github.com/jonschlinkert/array-each>
diff --git a/web/copy-props.min.js b/web/copy-props.min.js
index 26b2781..bd809c7 100644
--- a/web/copy-props.min.js
+++ b/web/copy-props.min.js
@@ -1,2 +1,2 @@
-!function(t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).copyProps=t()}(function(){return function i(u,a,c){function f(r,t){if(!a[r]){if(!u[r]){var n="function"==typeof require&&require;if(!t&&n)return n(r,!0);if(s)return s(r,!0);var e=new Error("Cannot find module '"+r+"'");throw e.code="MODULE_NOT_FOUND",e}var o=a[r]={exports:{}};u[r][0].call(o.exports,function(t){return f(u[r][1][t]||t)},o,o.exports,i,u,a,c)}return a[r].exports}for(var s="function"==typeof require&&require,t=0;t<c.length;t++)f(c[t]);return f}({1:[function(t,r,n){"use strict";var a=t("each-props"),c=t("is-plain-object").isPlainObject;function f(t,r,o){if(!c(t)){var i=o.fromto[r];if(i){delete o.fromto[r],Array.isArray(i)||(i=[i]);for(var u={keyChain:r,value:t,key:o.name,depth:o.depth,parent:o.parent},a=0,n=i.length;a<n;a++)l(o.dest,i[a],function(t,r,n){var e={keyChain:i[a],value:t[r],key:r,depth:n,parent:t};return o.convert(u,e)})}}}function s(t,o,i){if(c(t)){for(var r in t)return;l(i.dest,o,e)}else{var u={keyChain:o,value:t,key:i.name,depth:i.depth,parent:i.parent};l(i.dest,o,function(t,r,n){var e={keyChain:o,value:t[r],key:r,depth:n,parent:t};return i.convert(u,e)})}}function e(){return{}}function p(t){return t.value}function l(t,r,n){!function t(r,n,e,o){var i=n.shift();if(!n.length){var u=o(r,i,e);if(void 0===u)return;if(c(u)&&c(r[i]))return;return void(r[i]=u)}c(r[i])||(r[i]={});t(r[i],n,e+1,o)}(t,r.split("."),1,n)}function y(){}function v(t){return"[object Object]"===Object.prototype.toString.call(t)}r.exports=function(t,r,n,e,o){var i;v(t)||(t={}),v(r)||(r={}),n=c(n)?function(t){var r,n={};for(r in t){var e=t[r];"string"==typeof e&&(n[r]=e)}return n}(n):Array.isArray(n)?function(t){for(var r={},n=0,e=t.length;n<e;n++){var o=t[n];"string"==typeof o&&(r[o]=o)}return r}(n):("boolean"==typeof n?(o=n,e=p):"function"==typeof n&&(o=e,e=n),null),"function"!=typeof e&&(e=("boolean"==typeof e&&(o=e),p)),"boolean"!=typeof o&&(o=!1),o&&(i=t,t=r,r=i,n=n&&function(t){var r,n={};for(r in t){var e=t[r];n[e]||(n[e]=[]),n[e].push(r)}return n}(n));var u={dest:r,fromto:n,convert:e};return n?(a(t,f,u),function(t,r){for(var n in r){var e=r[n];Array.isArray(e)||(e=[e]);for(var o=0,i=e.length;o<i;o++)l(t,e[o],y)}}(r,n)):a(t,s,u),r}},{"each-props":4,"is-plain-object":8}],2:[function(t,r,n){"use strict";r.exports=function(t,r,n){if(null!=t)for(var e=t.length,o=-1;++o<e;){var i=t[o];if(!1===r.call(n,i,o,t))break}}},{}],3:[function(t,r,n){"use strict";function i(t,r,n){return r=null==r?n||0:r<0?Math.max(t+r,0):Math.min(r,t)}r.exports=function(t,r,n){var e=t.length,o=[];for(r=i(e,r),n=i(e,n,e);r<n;)o.push(t[r++]);return o}},{}],4:[function(t,r,n){"use strict";var b=t("is-plain-object"),d=t("object.defaults/immutable");r.exports=function(t,r,n){var e;e=t,"[object Object]"!==Object.prototype.toString.call(e)||"function"==typeof r&&(b(n)||(n={}),function t(r,n,e,o,i){var u=Object.keys(r);{var a;"function"==typeof i.sort&&(a=i.sort(u),Array.isArray(a)&&(u=a))}o+=1;for(var c=0,f=u.length;c<f;c++){var s=u[c],p=n+"."+s,l=r[s],y=d(i);y.name=s,y.index=c,y.count=f,y.depth=o,y.parent=r;var v=e(l,p.slice(1),y);!v&&b(l)&&t(l,p,e,o,i)}}(t,"",r,0,n))}},{"is-plain-object":5,"object.defaults/immutable":10}],5:[function(t,r,n){"use strict";var e=t("isobject");function o(t){return!0===e(t)&&"[object Object]"===Object.prototype.toString.call(t)}r.exports=function(t){var r,n;return!1!==o(t)&&("function"==typeof(r=t.constructor)&&(!1!==o(n=r.prototype)&&!1!==n.hasOwnProperty("isPrototypeOf")))}},{isobject:9}],6:[function(t,r,n){"use strict";r.exports=function(t,r,n){for(var e in t)if(!1===r.call(n,t[e],e,t))break}},{}],7:[function(t,r,n){"use strict";var i=t("for-in"),u=Object.prototype.hasOwnProperty;r.exports=function(n,e,o){i(n,function(t,r){if(u.call(n,r))return e.call(o,n[r],r,n)})}},{"for-in":6}],8:[function(t,r,n){"use strict";function e(t){return"[object Object]"===Object.prototype.toString.call(t)}Object.defineProperty(n,"__esModule",{value:!0}),n.isPlainObject=function(t){var r,n;return!1!==e(t)&&(void 0===(r=t.constructor)||!1!==e(n=r.prototype)&&!1!==n.hasOwnProperty("isPrototypeOf"))}},{}],9:[function(t,r,n){"use strict";r.exports=function(t){return null!=t&&"object"==typeof t&&!1===Array.isArray(t)}},{}],10:[function(t,r,n){"use strict";var e=t("array-slice"),o=t("./mutable");r.exports=function(){var t=e(arguments);return o.apply(null,[{}].concat(t))}},{"./mutable":11,"array-slice":3}],11:[function(t,r,n){"use strict";var e=t("array-each"),o=t("array-slice"),i=t("for-own"),u=t("isobject");r.exports=function(n,t){return null==n?{}:(e(o(arguments,1),function(t){u(t)&&i(t,function(t,r){null==n[r]&&(n[r]=t)})}),n)}},{"array-each":2,"array-slice":3,"for-own":7,isobject:9}]},{},[1])(1)});
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