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:A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.

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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