fix: authentication adapter app ID validation may be circumvented; this fixes a vulnerability that affects configurations which allow users to authenticate using the Parse Server authentication adapter for *Facebook* or *Spotify* and where the server-side authentication adapter configuration appIds is set as a string (e.g. abc) instead of an array of strings (e.g. ["abc"]) ([GHSA-r657-33vp-gp22](GHSA-r657-33vp-gp22)) (#8186)

Author: mtrezza

spec/AuthenticationAdapters.spec.js

@@ -441,6 +441,29 @@ describe('AuthenticationProviders', function () {
     expect(httpsRequest.get.calls.first().args[0].includes('appsecret_proof')).toBe(true);
   });
 
+  it('should throw error when Facebook request appId is wrong data type', async () => {
+    const httpsRequest = require('../lib/Adapters/Auth/httpsRequest');
+    spyOn(httpsRequest, 'get').and.callFake(() => {
+      return Promise.resolve({ id: 'a' });
+    });
+    const options = {
+      facebook: {
+        appIds: 'abcd',
+        appSecret: 'secret_sauce',
+      },
+    };
+    const authData = {
+      access_token: 'badtoken',
+    };
+    const { adapter, appIds, providerOptions } = authenticationLoader.loadAuthAdapter(
+      'facebook',
+      options
+    );
+    await expectAsync(adapter.validateAppId(appIds, authData, providerOptions)).toBeRejectedWith(
+      new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'appIds must be an array.')
+    );
+  });
+
   it('should handle Facebook appSecret for validating auth data', async () => {
     const httpsRequest = require('../lib/Adapters/Auth/httpsRequest');
     spyOn(httpsRequest, 'get').and.callFake(() => {

src/Adapters/Auth/facebook.js

@@ -29,22 +29,23 @@ function validateAuthData(authData, options) {
 }
 
 // Returns a promise that fulfills iff this app id is valid.
-function validateAppId(appIds, authData, options) {
+async function validateAppId(appIds, authData, options) {
   var access_token = authData.access_token;
   if (process.env.TESTING && access_token === 'test') {
-    return Promise.resolve();
+    return;
+  }
+  if (!Array.isArray(appIds)) {
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'appIds must be an array.');
   }
   if (!appIds.length) {
     throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is not configured.');
   }
-  return graphRequest(
-    'app?access_token=' + access_token + getAppSecretPath(authData, options)
-  ).then(data => {
-    if (data && appIds.indexOf(data.id) != -1) {
-      return;
-    }
+  const data = await graphRequest(
+    `app?access_token=${access_token}${getAppSecretPath(authData, options)}`
+  );
+  if (!data || !appIds.includes(data.id)) {
     throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is invalid for this user.');
-  });
+  }
 }
 
 // A promisey wrapper for FB graph requests.

src/Adapters/Auth/spotify.js

@@ -13,17 +13,18 @@ function validateAuthData(authData) {
 }
 
 // Returns a promise that fulfills if this app id is valid.
-function validateAppId(appIds, authData) {
-  var access_token = authData.access_token;
+async function validateAppId(appIds, authData) {
+  const access_token = authData.access_token;
+  if (!Array.isArray(appIds)) {
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'appIds must be an array.');
+  }
   if (!appIds.length) {
     throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Spotify auth is not configured.');
   }
-  return request('me', access_token).then(data => {
-    if (data && appIds.indexOf(data.id) != -1) {
-      return;
-    }
+  const data = await request('me', access_token);
+  if (!data || !appIds.includes(data.id)) {
     throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Spotify auth is invalid for this user.');
-  });
+  }
 }
 
 // A promisey wrapper for Spotify API requests.