Title

The system and user default umask must be 077. (Cat II impact)

Discussion

The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a 4-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 user defaults for each account on the system.

Check Content

NOTE: The following commands must be run in the BASH shell. Check global configuration: # find /etc -type f | xargs grep -i umask Check local initialization files: # cut -d: -f6 /etc/passwd | xargs -n1 -iHOMEDIR sh -c "grep umask HOMEDIR/.*" If the system and user default umask is not 077, this a finding. Note: If the default umask is 000 or allows for the creation of world writable files this becomes a CAT I finding..

Fix Text

Edit the /etc/default/login file for Solaris. Set the variable UMASK=077. Edit local and global initialization files containing "umask" and change them to use "077".

Additional Identifiers

Rule ID: SV-226587r603265_rule

Vulnerability ID: V-226587

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.