RubySec

Providing security resources for the Ruby community

CVE-2015-7565 (ember-source): Ember.js XSS Vulnerability with User-Supplied JSON

ADVISORIES

GEM

ember-source

UNAFFECTED VERSIONS

  • < 1.8.0

PATCHED VERSIONS

  • ~> 1.11.4
  • ~> 1.12.2
  • ~> 1.13.12
  • ~> 2.0.3
  • ~> 2.1.2
  • >= 2.2.1

DESCRIPTION

By default, Ember will escape any values in Handlebars templates that use double curlies ({{value}}). Developers can specifically opt out of this escaping behavior by passing an instance of SafeString rather than a raw string, which tells Ember that it should not escape the string because the developer has taken responsibility for escapement.

It is possible for an attacker to create a specially-crafted payload that causes a non-sanitized string to be treated as a SafeString, and thus bypass Ember’s normal escaping behavior. This could allow an attacker to execute arbitrary JavaScript in the context of the current domain (“XSS”).

All users running an affected release should either upgrade or use of the workarounds immediately.