IT Best Practices Tip: nist_V-38504
The /etc/shadow file must have mode 0000.
The "/etc/shadow" file contains the list of local system accounts and stores password hashes. Protection of this file is critical for system security. Failure to give ownership of this file to root provides the designated owner with access to sensitive information which could weaken the system security posture.
How to Check Correct Configuration
To check the permissions of "/etc/shadow", run the command:
$ ls -l /etc/shadow
If properly configured, the output should indicate the following permissions: "----------"
If it does not, this is a finding.
How to Fix
To properly set the permissions of "/etc/shadow", run the command:
# chmod 0000 /etc/shadow