The kernel in Apple iOS before 8 and Apple TV before 7 uses a predictable random number generator during the early portion of the boot process, which allows attackers to bypass certain kernel-hardening protection mechanisms by using a user-space process to observe data related to the random numbers.
archives.neohapsis.com/archives/bugtraq/2014-09/0106.html
archives.neohapsis.com/archives/bugtraq/2014-09/0107.html
archives.neohapsis.com/archives/bugtraq/2014-10/0101.html
support.apple.com/kb/HT6441
support.apple.com/kb/HT6442
www.securityfocus.com/bid/69882
www.securityfocus.com/bid/69911
www.securitytracker.com/id/1030866
exchange.xforce.ibmcloud.com/vulnerabilities/96096
support.apple.com/kb/HT6535