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https://github.com/didi/kemon

An Open-Source Pre and Post Callback-Based Framework for macOS Kernel Monitoring.
https://github.com/didi/kemon

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An Open-Source Pre and Post Callback-Based Framework for macOS Kernel Monitoring.

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# Kemon

An Open Source Pre and Post Callback-based Framework for macOS Kernel Monitoring.



[ Breaking News - 08/28/2019 ]  

macOS Catalina 10.15 Beta 7 Release Notes  

https://developer.apple.com/documentation/macos_release_notes/macos_catalina_10_15_beta_7_release_notes



Endpoint Security

 - The kauth API has been removed. (50419013)



/* After testing, I found that these Kauth interfaces are not really removed, and Kemon still works. But I think this release note means that the door to the macOS kernel is closing. (08/28/2019) */



## What is Kemon?

Kemon is an open source Pre and Post callback-based framework [1] for macOS kernel monitoring [2]. With the power of Kemon, we can easily implement XPC/IPC communication monitoring [3], Mandatory Access Control (MAC) policy filtering, network traffic and kernel extension firewall, etc. In general, from an attacker's perspective, this framework can help achieve more powerful Rootkit. From the perspective of defense, Kemon can help construct more granular monitoring capabilities.



I also implemented several kernel fuzzers [4] [7] based on this framework, which helped me find many kernel vulnerabilities, such as:



1. Graphics related kernel extensions:  

CVE-2017-7155, CVE-2017-7163, CVE-2017-13883 [10], CVE-2018-4350, CVE-2018-4396, CVE-2018-4418 [11], CVE-2019-8807 [12], CVE-2022-22631, CVE-2022-22661, CVE-2022-46706 [22], etc.



2. Wi-Fi IO80211FamilyV1/V2 [5] [9]:  

CVE-2020-9832, CVE-2020-9833, CVE-2020-9834 [14], CVE-2020-9899 [15], CVE-2020-10013 [16] [17] [18], CVE-2022-26761 [23], CVE-2022-26762 [24], CVE-2022-32837, CVE-2022-32847, CVE-2022-32860 [25] [26] [27], CVE-2022-32925, CVE-2022-46709 [28] [29], CVE-2023-38610 [30] [31], etc.



3. Bluetooth Host Controller Interface (HCI) [6]:  

CVE-2020-3892, CVE-2020-3893, CVE-2020-3905, CVE-2020-3907, CVE-2020-3908, CVE-2020-3912, CVE-2020-9779, CVE-2020-9853 [13], CVE-2020-9831 [14], CVE-2020-9928, CVE-2020-9929 [15], etc.



4. Kernel memory mapping mechanism [8]:  

CVE-2020-27914, CVE-2020-27915, CVE-2020-27936 [19] [20], CVE-2021-30678 [21], etc.



## Supported Features

Kemon's features include：

- file operation monitoring

- process creation monitoring

- dynamic library and kernel extension monitoring

- network traffic monitoring

- Mandatory Access Control (MAC) policy monitoring, etc.



In addition, Kemon project can also extend the Pre and Post callback-based monitoring interfaces for any macOS kernel function.



## Getting Started

### How to build the Kemon kernel extension

Please use Xcode project or makefile to build the Kemon kext driver



### How to use the Kemon kernel extension

Please turn off macOS System Integrity Protection (SIP) check if you don't have a valid kernel certificate  

Use the command "sudo chown -R root:wheel kemon.kext" to change the owner of the Kemon kernel extension  

Use the command "sudo kextload kemon.kext" to install the Kemon kernel extension  

Use the command "sudo kextunload kemon.kext" to uninstall the Kemon kernel extension



## Contributing

Welcome to contribute by creating issues or sending pull requests. See Contributing Guide for guidelines.



## License

Kemon is licensed under the Apache License 2.0. See the LICENSE file.



## References

1. https://patents.google.com/patent/US11106491B2

2. https://www.blackhat.com/us-18/arsenal/schedule/#kemon-an-open-source-pre-and-post-callback-based-framework-for-macos-kernel-monitoring-12085

3. https://www.blackhat.com/us-19/arsenal/schedule/#ksbox-a-fine-grained-macos-malware-sandbox-15059

4. https://www.defcon.org/html/defcon-26/dc-26-speakers.html#Wang

5. https://www.blackhat.com/us-20/briefings/schedule/index.html#dive-into-apple-iofamilyv-20023

6. https://www.blackhat.com/eu-20/briefings/schedule/index.html#please-make-a-dentist-appointment-asap-attacking-iobluetoothfamily-hci-and-vendor-specific-commands-21155

7. https://www.blackhat.com/us-20/arsenal/schedule/index.html#macos-bluetooth-analysis-suite-mbas-19886

8. https://www.blackhat.com/asia-21/briefings/schedule/index.html#racing-the-dark-a-new-tocttou-story-from-apples-core-22214

9. https://www.blackhat.com/us-22/briefings/schedule/#dive-into-apple-iofamily-vol--27728

10. https://support.apple.com/en-us/HT208331

11. https://support.apple.com/en-us/HT209193

12. https://support.apple.com/en-us/HT210722

13. https://support.apple.com/en-us/HT211100

14. https://support.apple.com/en-us/HT211170

15. https://support.apple.com/en-us/HT211289

16. https://support.apple.com/en-us/HT211843

17. https://support.apple.com/en-us/HT211849

18. https://support.apple.com/en-us/HT211850

19. https://support.apple.com/en-us/HT211931

20. https://support.apple.com/en-us/HT212011

21. https://support.apple.com/en-us/HT212529

22. https://support.apple.com/en-us/HT213183

23. https://support.apple.com/en-us/HT213257

24. https://support.apple.com/en-us/HT213258

25. https://support.apple.com/en-us/HT213346

26. https://support.apple.com/en-us/HT213345

27. https://support.apple.com/en-us/HT213344

28. https://support.apple.com/en-us/HT213446

29. https://support.apple.com/en-us/HT213486

30. https://support.apple.com/en-us/HT213938

31. https://support.apple.com/en-us/HT213940