Which of the following best explains why the SUID permission is set on the file? /bin/passwd

Question

Options

• ATo allow normal users to update the /etc/shadow file
• BTo ensure group permission on the file stay up to date
• CTo indicate an attacker has compromised the system
• DTo mark the file as immutable

• A
  95% (38)
• C
  3% (1)
• D
  3% (1)

Explanation

The Set User ID (SUID) permission allows a file to execute with the privileges of the file owner, rather than the user who runs it. The /bin/passwd command is used by users to change their own passwords. The actual password hashes are stored in /etc/shadow, which is only writable by the root user. Since normal users do not have direct write permissions on /etc/shadow, the SUID bit on /bin/passwd enables the command to run with root privileges, allowing password changes.

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