CVE-2021-3156 PoC — Sudo 缓冲区错误漏洞

Source

https://github.com/Rvn0xsy/CVE-2021-3156-plus

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。

Description

CVE-2021-3156非交互式执行命令

Readme

# CVE-2021-3156

![2021-02-10-02-18-07](images/450acf1a2f14793aafa987905b20eeba.png)

> This is a warehouse modification based on [@CptGibbon](https://github.com/CptGibbon/CVE-2021-3156 ) and supports arbitrary command execution.

相关阅读：[CVE-2021-3156 - Exploit修改](https://payloads.online/archivers/2021-02-09/1)

#### Root shell PoC for CVE-2021-3156 (no bruteforce)

For educational purposes etc.

Tested on :

- @CptGibbon Ubuntu 20.04 against sudo 1.8.31
- @Rvn0xsy Ubuntu 17.10

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 "Command"`

File Snapshot


 [4.0K]  /data/pocs/aa06167e628f596fb9fb4ed6feae6ce43c9a2f05
├── [3.1K]  exploit.c
├── [4.0K]  images
│   └── [101K]  450acf1a2f14793aafa987905b20eeba.png
├── [ 211]  Makefile
├── [1.0K]  README.md
└── [ 607]  shellcode.c

1 directory, 5 files

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