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User Account Control (UAC) is a mandatory access control enforcement feature introduced with Microsoft's Windows Vista [1] and Windows Server 2008 operating systems, with a more relaxed [2] version also present in Windows 7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows 8.1, Windows Server 2012 R2, Windows 10, and Windows 11.
Mandatory Integrity Control is defined using a new access control entry (ACE) type to represent the object's IL in its security descriptor. In Windows, Access Control Lists (ACLs) are used to grant access rights (read, write, and execute permissions) and privileges to users or groups.
Features include: Windows Vista Web Filter—implemented as a Winsock LSP filter to function across all Web browsers—which prohibits access to websites based on categories of content or specific addresses (with an option to block all file downloads); Time Limits, which prevents standard users from logging in during a date or time specified by ...
For example, a user can be granted access to change anybody's password except for the root account, as follows: pete ALL = /usr/bin/passwd [A-z]*, !/usr/bin/passwd root User Account Control uses a combination of heuristic scanning and "application manifests" to determine if an application requires administrator privileges. [19]
Windows Vista adds mandatory access control info to DACLs. DACLs are the primary focus of User Account Control in Windows Vista and later. The second ACL, called system access control list (SACL), defines which interactions with the file or folder are to be audited and whether they should be logged when the activity is successful, failed or both.
Although User Account Control (UAC) is an important part of Vista's security infrastructure as it blocks software from silently gaining administrator privileges without the user's knowledge, it has been widely criticized for generating too many prompts. [197]
User Account Control in Windows Vista improves this by limiting application software to standard user privileges until an administrator authorizes an increase in privilege level. In this way, UAC prevents users from making inadvertent changes to system settings and locks down the computer to prevent unauthorized applications from installing or ...
When User Account Control is enabled, any process started with Administrator-level privileges does not inherit the drive mappings of the interactively logged on user, despite the same account being used. This can lead to scenarios where non-UAC processes such as Windows Explorer have access to an application on a network drive, but insufficient ...