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: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

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

Remarks

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