module
Microsoft Windows ALPC Task Scheduler Local Privilege Elevation
| Disclosed | Created |
|---|---|
| 08/27/2018 | 03/19/2019 |
Disclosed
08/27/2018
Created
03/19/2019
Description
On vulnerable versions of Windows the alpc endpoint method SchRpcSetSecurity implemented
by the task scheduler service can be used to write arbitrary DACLs to `.job` files located
in `c:\windows\tasks` because the scheduler does not use impersonation when checking this
location. Since users can create files in the `c:\windows\tasks` folder, a hardlink can be
created to a file the user has read access to. After creating a hardlink, the vulnerability
can be triggered to set the DACL on the linked file.
WARNING:
The PrintConfig.dll (%windir%\system32\driverstor\filerepository\prnms003*) on the target host
will be overwritten when the exploit runs.
This module has been tested against Windows 10 Pro x64.
by the task scheduler service can be used to write arbitrary DACLs to `.job` files located
in `c:\windows\tasks` because the scheduler does not use impersonation when checking this
location. Since users can create files in the `c:\windows\tasks` folder, a hardlink can be
created to a file the user has read access to. After creating a hardlink, the vulnerability
can be triggered to set the DACL on the linked file.
WARNING:
The PrintConfig.dll (%windir%\system32\driverstor\filerepository\prnms003*) on the target host
will be overwritten when the exploit runs.
This module has been tested against Windows 10 Pro x64.
Authors
SandboxEscaperbwatters-r7asoto-r7Jacob Robles
Platform
Windows
References
Module Options
To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:
msf > use exploit/windows/local/alpc_taskscheduler
msf /(r) > show actions
...actions...
msf /(r) > set ACTION < action-name >
msf /(r) > show options
...show and set options...
msf /(r) > run
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