Information
The /etc/shadow file is used to store the information about user accounts that is critical to the security of those accounts, such as the hashed password and other security information.
Rationale:
If attackers can gain read access to the /etc/shadow file, they can easily run a password cracking program against the hashed password to break it. Other security information that is stored in the /etc/shadow file (such as expiration) could also be useful to subvert the user accounts.
Solution
Run the following command to remove excess permissions:
# /bin/chmod u-wx,go-rwx /etc/shadow
Default Value:
OS Default: Yes