Process explorer integrity level11/11/2023 Therefore, all objects that are created by a process with a subject integrity level less than the default level (medium) are explicitly labeled by the security subsystem. Processes with a low integrity level will not be able to modify any object with either an explicit or implicit integrity level of medium or higher, regardless of the access rights granted in the DACL to the security principal. If a process is running with a subject integrity level less than the default integrity level of medium, that process will have restricted access permissions to all objects that have an implicit medium integrity level. A medium-integrity application that tried to open the user's high-integrity documents would receive an Access Denied error. After UAC is enabled, the user would not be able to open files that were created when UAC was disabled. However, if UAC is enabled by local computer or Group Policy, most processes run by the same user are assigned a filtered security access token at a medium integrity level. The high label would seem appropriate, even though the inherited DACL permissions for the user profile provide sufficient access control for user access. If all objects are explicitly labeled at the subject’s integrity level, then all files such as documents and spreadsheets that the user creates would be assigned a high integrity level. When UAC is disabled, a user who is a member of the local Administrators group has all processes running with a full privilege access token at a high integrity level. A specific example is based on the ability to enable or disable User Account Control by using local security policy. The thread objects within the explorer.exe process are assigned an integrity level of medium, which is the integrity level of the primary access token of the creating process.Ī number of design constraints required using the default implicit mandatory label of medium, instead of assigning an explicit mandatory label based on the subject’s integrity level for most object types. When the explorer.exe process creates a new thread, the thread object is given a security descriptor, and the security subsystem assigns an integrity level to the thread object based on the integrity level of the creating process. The primary access token for explorer.exe is inherited from the creating parent process, userinit.exe, and has an integrity level of medium. The mandatory label on the explorer.exe process is set to the integrity level of the creating process, userinit.exe, which is medium. The process object includes a security descriptor and primary access token. When userinit.exe calls CreateProcess to launch the shell, the process object for explorer.exe is initialized. When the process object is created, the security descriptor for that process is assigned the integrity level from the access token that is assigned as the primary access token to the new process. CreateProcessAsUser creates a process object and an initial thread, among other things.
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