tijme/kernel-mii

Cobalt Strike (CS) Beacon Object File (BOF) foundation for kernel exploitation using CVE-2021-21551.

Cobalt Strike Beacon Object File foundation for kernel exploitation using CVE-2021-21551.
^{Built by Tijme. Credits to Alex for teaching me! Made possible by Northwave Security}

Description

This is a Cobalt Strike (CS) Beacon Object File (BOF) which exploits CVE-2021-21551. It only overwrites the beacon process token with the system process token. But this BOF is mostly just a good foundation for further kernel exploitation via CS.

Usage

Clone this repository first. Then review the code, compile from source and use it in Cobalt Strike.

Compiling

make

Usage

Load the KernelMii.cna script using the Cobalt Strike Script Manager. Then use the command below to execute the exploit.

$ kernel_mii

Alternatively (and for testing purposes), you can directly run the compiled executable. This will spawn a command prompt as SYSTEM.

$ .\KernelMii.x64.exe

Limitations

• If the vulnerable driver is not installed, you need to be local admin to install it.

Todo

• Load the vulnerable driver from memory instead of from disk.
• Delete the vulnerable driver if it was not preinstalled.
• Make the exploit stable & compatible with multiple Windows versions.

Issues

Issues or new features can be reported via the issue tracker. Please make sure your issue or feature has not yet been reported by anyone else before submitting a new one.

License

Copyright (c) 2022 Tijme Gommers & Northwave Security. All rights reserved. View LICENSE.md for the full license.