WebKit, as used in Apple Safari before 6.1.3 and 7.x before 7.0.3, does not properly validate WebProcess IPC messages, which allows remote attackers to bypass a sandbox protection mechanism and read arbitrary files by leveraging WebProcess access.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-1375
http://archives.neohapsis.com/archives/bugtraq/2014-04/0009.html