□ Win + E : Execute windows Explorer □ Win + R : Execute Windows run □ Win + T : Check program thumbnail in order at the taskbar □ Win + U : Execute ease of access center at control panel □ Win + D : Minimize

□ Command to check linux distribution type, version    ○ cat /etc/*-release    ○ cat /etc/issue* □ Command to check linux kernel version : uname -a It is posted also at :

□ Checking Available shells : cat /etc/shells □ Environment variable for recording depth of shell : SHLVL(=SHell LeVeL) ps. Checking Shell depth : env | grpe SH SHLVL = 1 is a state that only login-shell

□ .bashrc : Bash shell configuration file. It is loaded when you execute Bash shell with no-login □ .bash_profile : Bash shell configuration file. It is loaded when you login with bash shell You can see

□ setresuid/setresgid : SET R(eal), E(ffective), S(aved) UID/GID □ It changes permission of currently active processes. □ man page : Also posted at :

After login, Go to "home / flag01" path, you can see the flag01 file. setuid is set. And when you execute the file, It prints out "and now what?". Through a given source, it can be expected the following

1. Login level00(Check login status using whoami command) 2. Insert command : find / -perm -4000 -user flag00 -exec ls -al 1> ~/00result.txt 2> /dev/null {} \; A. find : Command to search for files

Introduction to Nebula