CVE-2021-4034# 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.
## Usage
### Build
This creates a Pyinstaller executable using the Python source code.
*Requires Pyinstaller be installed (`pip3 install pyinstaller`)*
*May also require extra imports or dependencies when building, depending on your environment. This can easily be done by using Pyinstaller's provided `--hidden-import` option*
```bash
pyinstaller CVE-2021-4034.py --clean --onefile -n exploit
```
### Run (Binary)
```bash
./exploit
```
### Run (Source)
```bash
python3 CVE-2021-4034.py
```
[4.0K] /data/pocs/fec684bbe9318c47d78d1fde3f4d92feb7f7793a
├── [1.3K] LICENSE
├── [1.1K] README.md
└── [4.0K] src
└── [3.2K] CVE-2021-4034.py
1 directory, 3 files