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A very common issue that we still constantly encounter is shown in heap level 2 of exploit-exercises.com. This is a classic use-after-free vulnerability. Lets try to understand the code first. We have here a big while loop inside of main. In each round it prints the variable auth, which is a pointer to an object of this auth struct up here. And auth has the attributes name which is a string up to 32 characters and an integer. And the other variable that is printed is a char pointer service, which can point to a string in memory. So both of these are addresses - pointers. Then we read a line from standard input. Maximum 128 bytes, so this is a secure fgets read. No buffer overflow. Afterwards we have a couple of ifs that check if the input line is one of the following commands. Either auth, reset, service or login. Lets execute the program as well and then lets talk about each command. When we first start the program, both the auth and the service pointer are null. Now we wa
