tls: fix object prototype type confusion

Use `Object.create(null)` for dictionary objects so that keys from
certificate strings or the authorityInfoAccess field cannot conflict
with Object.prototype properties.

PR-URL: https://github.com/nodejs/node/pull/14447
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

1 files changed, 22 insertions, 8 deletions

diff --git a/test/parallel/test-tls-translate-peer-certificate.js b/test/parallel/test-tls-translate-peer-certificate.js
index 537c00a009..f8499e0c7e 100644
--- a/test/parallel/test-tls-translate-peer-certificate.js
+++ b/test/parallel/test-tls-translate-peer-certificate.js
@@ -1,3 +1,4 @@
+/* eslint-disable no-proto */
 'use strict';
 const common = require('../common');
 
@@ -7,8 +8,12 @@ if (!common.hasCrypto)
 const { strictEqual, deepStrictEqual } = require('assert');
 const { translatePeerCertificate } = require('_tls_common');
 
-const certString = 'A=1\nB=2\nC=3';
-const certObject = { A: '1', B: '2', C: '3' };
+const certString = '__proto__=42\nA=1\nB=2\nC=3';
+const certObject = Object.create(null);
+certObject.__proto__ = '42';
+certObject.A = '1';
+certObject.B = '2';
+certObject.C = '3';
 
 strictEqual(translatePeerCertificate(null), null);
 strictEqual(translatePeerCertificate(undefined), null);
@@ -19,14 +24,14 @@ strictEqual(translatePeerCertificate(1), 1);
 deepStrictEqual(translatePeerCertificate({}), {});
 
 deepStrictEqual(translatePeerCertificate({ issuer: '' }),
-                { issuer: {} });
+                { issuer: Object.create(null) });
 deepStrictEqual(translatePeerCertificate({ issuer: null }),
                 { issuer: null });
 deepStrictEqual(translatePeerCertificate({ issuer: certString }),
                 { issuer: certObject });
 
 deepStrictEqual(translatePeerCertificate({ subject: '' }),
-                { subject: {} });
+                { subject: Object.create(null) });
 deepStrictEqual(translatePeerCertificate({ subject: null }),
                 { subject: null });
 deepStrictEqual(translatePeerCertificate({ subject: certString }),
@@ -47,9 +52,18 @@ deepStrictEqual(
 }
 
 deepStrictEqual(translatePeerCertificate({ infoAccess: '' }),
-                { infoAccess: {} });
+                { infoAccess: Object.create(null) });
 deepStrictEqual(translatePeerCertificate({ infoAccess: null }),
                 { infoAccess: null });
-deepStrictEqual(
-  translatePeerCertificate({ infoAccess: 'OCSP - URI:file:///etc/passwd' }),
-  { infoAccess: { 'OCSP - URI': ['file:///etc/passwd'] } });
+{
+  const input =
+      '__proto__:mostly harmless\n' +
+      'hasOwnProperty:not a function\n' +
+      'OCSP - URI:file:///etc/passwd\n';
+  const expected = Object.create(null);
+  expected.__proto__ = ['mostly harmless'];
+  expected.hasOwnProperty = ['not a function'];
+  expected['OCSP - URI'] = ['file:///etc/passwd'];
+  deepStrictEqual(translatePeerCertificate({ infoAccess: input }),
+                  { infoAccess: expected });
+}