A new update is available for Base SAS , version 9.4_M3 :
In UNIX environments, enabling the SAS® Logging Facility results in logs with permissions that do not follow the umask setting
When files are created by the SAS® threaded kernel I/O services under UNIX, default permissions are set to 0777 (rwxrwxrwx)
Note: A comprehensive list of all SAS hot fixes is available from support.sas.com. You can use the SAS Hot Fix Analysis, Download, and Deployment (SASHFADD) tool to manage your SAS hot fixes.