P0sixspwn

p0sixspwn is an untethered jailbreak for iOS 6.1.3-6.1.6 by winocm, iH8sn0w and SquiffyPwn. It was initially made available as an Cydia package on Saurik's repo to untether already jailbroken devices. It works with all devices that support iOS 6.1.3-6.1.6 and 5.2.1 - 5.3 on Apple TV 2G. On 30 December 2013, a Mac OS X program was released to perform a jailbreak. A Windows program was released on 3 January 2014.

Cydia Package Changelog

 * 1.0-5 the initial release of the untether
 * 1.0-9 iPhone 4 (iPhone3,1) boot loop fix
 * 1.1-1 Automatically reboot after 30 seconds if device did not boot. (iH8sn0w's repo only)
 * 1.1-2 Automatically reboot after one minute if device did not boot due to 30 seconds was too quick. (iH8sn0w's repo only)
 * 1.1-3 Automatically reboot after two minutes if device did not boot due to 60 seconds was too quick. (iH8sn0w's repo only)
 * 1.2-1 Various bug fixes.
 * 1.3-2 Fixes iMessage, LTE issues and Apple TV 2G support.
 * 1.4-1 Support iOS 6.1.6.

Exploits

 * posix_spawn kernel information leak (by i0n1c)
 * posix_spawn kernel exploit (CVE-2013-3954) (by i0n1c)
 * mach_msg_ool_descriptor_ts for heap shaping
 * AMFID_code_signing_evasi0n7
 * DeveloperDiskImage race condition (by comex)
 * launchd.conf untether

Interesting strings
These strings were found on the jailbroken device in /var/untether/untether: This suggests that there was plans to jailbreak Apple TVs: