CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

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

CVE-2021-4034

Readme

# CVE-2021-4043

A memory corruption vulnerability was discovered in pkexec of polkit (previously PolicyKit).

[![asciicast](https://asciinema.org/a/2ofNaUmmZeO7HT6fNZXpV15FD.svg)](https://asciinema.org/a/2ofNaUmmZeO7HT6fNZXpV15FD)

## Reference

- https://beny23.github.io/posts/pwnkit_how_to_check_and_exploit/
- https://beaglesecurity.com/blog/vulnerability/pwnkit-linux-system-bug-allowing-distro-root-access.html
- https://thehackernews.com/2022/01/12-year-old-polkit-flaw-lets.html

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 →