CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/navisec/CVE-2021-4034-PwnKit

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

PwnKit PoC for Polkit pkexec CVE-2021-4034

Readme

# CVE-2021-4034-PwnKit
PwnKit PoC for Polkit pkexec CVE-2021-4034 

Based on the PoC by blasty  
[blasty-vs-pkexec.c](https://haxx.in/files/blasty-vs-pkexec.c)

For PwnKit details see the blog poet at Qualys
[PwnKit: Local Privilege Escalation Vulnerability Discovered in polkit’s pkexec (CVE-2021-4034)](https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034)


## Summary
This repo is a nim based PwnKit PoC. The payload shared library is embedded in the executable, so gcc is not required on the target.


To get set up with a nim enviroment, see HuskyHacks post. 
[Nim on the Attack: Process Injection Using Nim and the Windows API](https://huskyhacks.dev/2021/07/17/nim-exploit-dev/)

Issues and PRs welcome.

## Setup

Clone the repo and run make to create the navipwnkit executable.

Copy the executable to the target and run to get root.

![navipwnkit getting root](/screenshots/navipwnkit.png)

File Snapshot


 [4.0K]  /data/pocs/116d402f81b6593525a21e0ec988693465abf783
├── [1.0K]  LICENSE
├── [ 187]  Makefile
├── [ 612]  navipwnkit.nim
├── [ 414]  payload.nim
├── [1008]  README.md
└── [4.0K]  screenshots
    └── [ 12K]  navipwnkit.png

1 directory, 6 files

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