Bandit Level 19 → Level 20

To gain access to the next level, you should use the setuid binary in the homedirectory. Execute it without arguments to find out how to use it. The password for this level can be found in the usual place (/etc/bandit_pass), after you have used the setuid binary.

解密

bandit19@bandit:~$ ls -l
total 8
-rwsr-x--- 1 bandit20 bandit19 7296 Oct 16  2018 bandit20-do
bandit19@bandit:~$ ./bandit20-do cat /etc/bandit_pass/bandit20
GbKksEFF4yrVs6il55v6gwY5aVje5f0j

知识点

  1. ls -l看到文件bandit20-do在执行位上的标志为s，表名设置了setuid，即“执行该文件会以文件所有者的身份”，而非普通的执行者身份；