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CVE-2020-27904 PoC — Apple Kernel 安全漏洞

Source
https://github.com/pattern-f/xattr-oob-swap
Associated Vulnerability
Title:Apple Kernel 安全漏洞 (CVE-2020-27904)
Description:A logic issue existed resulting in memory corruption. This was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1. An application may be able to execute arbitrary code with kernel privileges.
Description
Demo exploit code for CVE-2020-27904, a tfp0 bug.
Readme
# xattr-oob-swap

CVE-2020-27904: a tfp0 bug for macOS 10.15.x and below.

Demo exploit code for my [talk](https://www.blackhat.com/asia-21/briefings/schedule/#the-price-of-compatibility-defeating-macos-kernel-using-extended-file-attributes-21799) at BlackHat ASIA 2021.

The vulnerability has been fixed in macOS Big Sur 11.0, and the latest 10.15&10.14 security update.

# Warranty

**Use it on your own risk. This will make you macOS panic.** I build it for security researchers only.

# Current state

Get tfp0. Tested on **macOS 10.15.2 (19C57)**, MacBook Pro with 16 GB RAM.

Fix kheap by yourself. I leave it empty on purpose.

# Credits

* Almost everything starts from oob_timestamp: Brandon Azad (@_bazad)

# License

GPL-3.0 License

# Misc

my twitter [@pattern_F_](https://twitter.com/pattern_F_)

English is hard for me...

英语太难了...
File Snapshot

 [4.0K]  /data/pocs/f29a5feb2e271c2b12a47ac965c125dd5ca36328
├── [4.0K]  exploit-1
│   ├── [7.5K]  apple_double.c
│   ├── [3.8K]  apple_double.h
│   ├── [ 21K]  exploit.c
│   ├── [1.8K]  ipc_port.h
│   └── [ 292]  main.c
├── [ 34K]  LICENSE
├── [  77]  Makefile
├── [4.0K]  mylib
│   ├── [ 20K]  IOSurface_lib.c
│   ├── [ 962]  kapi.h
│   ├── [3.2K]  kapi_memory.c
│   ├── [4.3K]  k_offsets.c
│   ├── [2.5K]  k_offsets.h
│   ├── [4.8K]  k_utils.c
│   ├── [ 516]  k_utils.h
│   ├── [1.8K]  mycommon.h
│   ├── [1.8K]  sys_darwin.c
│   ├── [ 53K]  user_kernel_alloc.c
│   ├── [3.0K]  user_kernel_alloc.h
│   ├── [6.7K]  utils.c
│   └── [ 938]  utils.h
├── [ 856]  README.md
└── [ 510]  run-exploit.py

2 directories, 22 files
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