Microsoft has released a huge update for Windows 8.1 (KB3000850)
Microsoft has quietly released a new service pack for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2. This is a huge Service Pack (KB3000850) which weighs about 723 MB 60 and fixes various problems in the latest version of Windows. Deployment started on 18 November and, interestingly, this patch belongs to the category of optional updates.
In KB3000850 includes all previous updates released since the launch of the last major update in April 2014, Technically this Service Pack, however unlike the updates in April, November is optional, i.e. without it, your system will continue to receive updates. Microsoft also points out that this update does not change the version number of the operating system.
The company also released two additional updates: MS14-068/KB3011780 and MS14-066/KB3018238.
The KB3011780 update fixes a problem with the network authentication Protocol (Kerberos) that could allow attackers to elevate unprivileged user account to domain administrator account of the domain. This update corrects a problem in Windows Vista, Windows 7, Windows 8.1 and even in Windows Technical Preview.
Patch KB3018238 is a revised version of KB2992611 and updates addresses a vulnerability that could allow remote code execution. If you have already downloaded and installed the previous KB2992611, the company also recommends that you install the latest update.