Add fix from #283

Author: colincasey

lib/__tests__/cookieJar.spec.ts

@@ -29,7 +29,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-import {Cookie, CookieJar, MemoryCookieStore, ParameterError, SerializedCookieJar, Store} from '../cookie'
+import { Cookie, CookieJar, MemoryCookieStore, ParameterError, SerializedCookieJar, Store } from "../cookie";
 
 const { objectContaining, assertions } = expect
 jest.useFakeTimers()
@@ -1008,6 +1008,24 @@ it('should fix issue #197 - CookieJar().setCookie throws an error when empty coo
   )).rejects.toThrowError('Cookie failed to parse')
 })
 
+it('should fix issue #282 - Prototype pollution when setting a cookie with the domain __proto__', async () => {
+  const jar = new CookieJar(undefined, {
+    rejectPublicSuffixes: false
+  });
+  // try to pollute the prototype
+  jar.setCookieSync(
+    "Slonser=polluted; Domain=__proto__; Path=/notauth",
+    "https://__proto__/admin"
+  );
+  jar.setCookieSync(
+    "Auth=Lol; Domain=google.com; Path=/notauth",
+    "https://google.com/"
+  );
+
+  const pollutedObject = {};
+  expect('/notauth' in pollutedObject).toBe(false);
+})
+
 // special use domains under a sub-domain
 describe.each([
   "local",

lib/memstore.ts

@@ -29,9 +29,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 "use strict";
-import {Callback, Cookie, createPromiseCallback, pathMatch, permuteDomain} from "./cookie";
-import {Store} from './store'
-import {getCustomInspectSymbol, getUtilInspect} from './utilHelper'
+import { Callback, Cookie, createPromiseCallback, pathMatch, permuteDomain } from "./cookie";
+import { Store } from "./store";
+import { getCustomInspectSymbol, getUtilInspect } from "./utilHelper";
 
 export class MemoryCookieStore extends Store {
   override synchronous: boolean;
@@ -46,7 +46,7 @@ export class MemoryCookieStore extends Store {
   constructor() {
     super();
     this.synchronous = true;
-    this.idx = {};
+    this.idx = Object.create(null);
     const customInspectSymbol = getCustomInspectSymbol();
     if (customInspectSymbol) {
       // @ts-ignore
@@ -154,10 +154,10 @@ export class MemoryCookieStore extends Store {
       return promiseCallback.promise
     }
 
-    const domainEntry: { [key: string]: any } = this.idx[domain] ?? {}
+    const domainEntry: { [key: string]: any } = this.idx[domain] ?? Object.create(null)
     this.idx[domain] = domainEntry
 
-    const pathEntry: { [key: string]: any } = domainEntry[path] ?? {}
+    const pathEntry: { [key: string]: any } = domainEntry[path] ?? Object.create(null)
     domainEntry[path] = pathEntry
 
     pathEntry[key] = cookie
@@ -225,7 +225,7 @@ export class MemoryCookieStore extends Store {
     const promiseCallback = createPromiseCallback<void>(arguments)
     const cb = promiseCallback.callback
 
-    this.idx = {};
+    this.idx = Object.create(null);
 
     cb(null);
     return promiseCallback.promise
@@ -270,9 +270,9 @@ export class MemoryCookieStore extends Store {
 export function inspectFallback(val: { [x: string]: any; }) {
   const domains = Object.keys(val);
   if (domains.length === 0) {
-    return "{}";
+    return "[Object: null prototype] {}";
   }
-  let result = "{\n";
+  let result = "[Object: null prototype] {\n";
   Object.keys(val).forEach((domain, i) => {
     result += formatDomain(domain, val[domain]);
     if (i < domains.length - 1) {
@@ -286,7 +286,7 @@ export function inspectFallback(val: { [x: string]: any; }) {
 
 function formatDomain(domainName: string, domainValue: { [x: string]: any; }) {
   const indent = "  ";
-  let result = `${indent}'${domainName}': {\n`;
+  let result = `${indent}'${domainName}': [Object: null prototype] {\n`;
   Object.keys(domainValue).forEach((path, i, paths) => {
     result += formatPath(path, domainValue[path]);
     if (i < paths.length - 1) {
@@ -300,7 +300,7 @@ function formatDomain(domainName: string, domainValue: { [x: string]: any; }) {
 
 function formatPath(pathName: string, pathValue: { [x: string]: any; }) {
   const indent = "    ";
-  let result = `${indent}'${pathName}': {\n`;
+  let result = `${indent}'${pathName}': [Object: null prototype] {\n`;
   Object.keys(pathValue).forEach((cookieName, i, cookieNames) => {
     const cookie = pathValue[cookieName];
     result += `      ${cookieName}: ${cookie.inspect()}`;

test/cookie_jar_test.js

@@ -810,4 +810,29 @@ vows
       }
     }
   })
+  .addBatch({
+    "Issue #282 - Prototype pollution": {
+      "when setting a cookie with the domain __proto__": {
+        topic: function() {
+          const jar = new tough.CookieJar(undefined, {
+            rejectPublicSuffixes: false
+          });
+          // try to pollute the prototype
+          jar.setCookieSync(
+            "Slonser=polluted; Domain=__proto__; Path=/notauth",
+            "https://__proto__/admin"
+          );
+          jar.setCookieSync(
+            "Auth=Lol; Domain=google.com; Path=/notauth",
+            "https://google.com/"
+          );
+          this.callback();
+        },
+        "results in a cookie that is not affected by the attempted prototype pollution": function() {
+          const pollutedObject = {};
+          assert(pollutedObject["/notauth"] === undefined);
+        }
+      }
+    }
+  })
   .export(module);