CVE-2021-3156 PoC — Sudo 缓冲区错误漏洞

Source

https://github.com/donghyunlee00/CVE-2021-3156

Associated Vulnerability

Title:Sudo 缓冲区错误漏洞 (CVE-2021-3156)
Description:Sudo是一款使用于类Unix系统的，允许用户通过安全的方式使用特殊的权限执行命令的程序。 Sudo 1.9.5p2 之前版本存在缓冲区错误漏洞，攻击者可使用sudoedit -s和一个以单个反斜杠字符结束的命令行参数升级到root。

Readme

# CVE-2021-3156
#### Root shell PoC for CVE-2021-3156 (no bruteforce)
For educational purposes etc.

Tested on Ubuntu 20.04 against sudo 1.8.31

All research credit: **Qualys Research Team**
Check out the details on their [blog](https://blog.qualys.com/vulnerabilities-research/2021/01/26/cve-2021-3156-heap-based-buffer-overflow-in-sudo-baron-samedit).

You can check your version of sudo is vulnerable with: `$ sudoedit -s Y`.
If it asks for your password it's most likely vulnerable, if it prints usage information it isn't.
You can downgrade to the vulnerable version on Ubuntu 20.04 for testing purposes with `$ sudo apt install sudo=1.8.31-1ubuntu1`

#### Usage
`$ make`

`$ ./exploit`

File Snapshot


 [4.0K]  /data/pocs/8e2db213e757cd7ffedfadb6a4b0f26b43f7e918
├── [5.6K]  CVE-2021-3156.tar.gz
├── [ 16K]  exploit
├── [2.0K]  exploit.c
├── [4.0K]  libnss_x
│   └── [ 14K]  x.so.2
├── [ 208]  Makefile
├── [ 692]  README.md
└── [ 599]  shellcode.c

1 directory, 7 files

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