App - System

If I run /bin/dash from bash then I do not get permission to open the .passwd file. But when /bin/dash runs from the executable then I get permission to open the .passwd file. Why does this happen?

When a program runs a command its run as the owner of the program which in this case is the cracked account

Hey, guys
Can anyone explain why I got the message "Yeah dude ! You win !" but didn’t get dash shell?

I tried this on my Linux Mint 18.2, gave the binary suid bit, owner is a sudo user, group is the current user etc.
But ch13 is still executed as current user, not the file owner. What am I missing here?