The Red Hat Enterprise Linux operating system must set the umask value to 077 for all local interactive user accounts.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Part of SRG-OS-000480-GPOS-00227

Associated with: CCI-000318 CCI-000368 CCI-001812 CCI-001813 CCI-001814

SV-86673r2_rule The Red Hat Enterprise Linux operating system must set the umask value to 077 for all local interactive user accounts.

Vulnerability discussion

The umask controls the default access mode assigned to newly created files. A umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a four-digit number, the first digit representing special access modes is typically ignored or required to be "0". This requirement applies to the globally configured system defaults and the local interactive user defaults for each account on the system.

Check content

Verify that the default umask for all local interactive users is "077". Identify the locations of all local interactive user home directories by looking at the "/etc/passwd" file. Check all local interactive user initialization files for interactive users with the following command: Note: The example is for a system that is configured to create users home directories in the "/home" directory. # grep -i umask /home/*/.* If any local interactive user initialization files are found to have a umask statement that has a value less restrictive than "077", this is a finding.

Fix text

Remove the umask statement from all local interactive user's initialization files. If the account is for an application, the requirement for a umask less restrictive than "077" can be documented with the Information System Security Officer, but the user agreement for access to the account must specify that the local interactive user must log on to their account first and then switch the user to the application account with the correct option to gain the account's environment variables.

Pro Tips

Powered by sagemincer