CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/cd80-ctf/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

A simple proof-of-concept for CVE-2021-4034 (pkexec local privilege escalation)

Readme

# CVE-2021-4034
A simple proof-of-concept for CVE-2021-4034 (pkexec local privilege escalation). Based on the excellent [summary](https://packetstormsecurity.com/files/165726/Polkit-pkexec-Local-Privilege-Escalation.html) by our friends at Qualsys.

# How do?
1. Clone this repository onto a machine with a vulnerable version of `pkexec`.
2. `./run.sh`
3. Shenanigans.

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →

Goal Reached Thanks to every supporter — we hit 100%!