CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/PwnFunction/CVE-2021-4034

Associated Vulnerability

Title:polkit 缓冲区错误漏洞 (CVE-2021-4034)
Description:polkit是一个在类 Unix操作系统中控制系统范围权限的组件。通过定义和审核权限规则，实现不同优先级进程间的通讯。 polkit 的 pkexec application存在缓冲区错误漏洞，攻击者可利用该漏洞通过精心设计环境变量诱导pkexec执行任意代码。成功执行攻击后，如果目标计算机上没有权限的用户拥有管理权限，攻击可能会导致本地权限升级。

Description

Proof of concept for pwnkit vulnerability

Readme

# CVE-2021-4034

Local privilege escalation via `pkexec`

## YouTube video

<p>
  <a href='https://www.youtube.com/watch?v=eTcVLqKpZJc'>
    <img src="https://user-images.githubusercontent.com/19750782/162562498-078f4bcb-4403-4ec4-acd4-b59530f081db.png" alt="PwnFunction YouTube Video" width="600">
  </a>
</p>

Watch the [✨ YouTube Video](https://www.youtube.com/watch?v=eTcVLqKpZJc)

## Run locally

```sh
make all && ./pwnkit && make clean
```

## Run in docker

```sh
# Build the docker image
docker build -t pwnkit .

# Run the exploit
docker run -it pwnkit bash
make all && ./pwnkit && make clean
```

## Detect using snyk-cli

```
snyk container test pwnkit:latest --file=Dockerfile
```

## Resources

- [Qualys Security Advisory](https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt)
- [argv silliness](https://ryiron.wordpress.com/2013/12/16/argv-silliness/)

File Snapshot


 [4.0K]  /data/pocs/db71f4c3693eb9048d2305c1adee17693409c6ae
├── [ 327]  conversion-mod.c
├── [ 474]  Dockerfile
├── [ 367]  Makefile
├── [6.0K]  pwnkit.c
└── [ 876]  README.md

0 directories, 5 files

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