An issue was discovered in certain Apple products. macOS before 10.12.2 is affected. The issue involves the "OpenPAM" component, which allows local users to obtain sensitive information by leveraging mishandling of failed PAM authentication by a sandboxed app.
Apple Security Advisory 2016-12-13-1 - macOS 10.12.2 is now available and addresses arbitrary code execution, denial of service, and various other vulnerabilities.