SAS/Internet 9.4 build 1520 and earlier allows local file inclusion. The samples library (included by default) in the appstart.sas file, allows end-users of the application to access the sample.webcsf1.sas program, which contains user-controlled macro variables that are passed to the DS2CSF macro.
id: CVE-2021-41569
info:
name: SAS/Internet 9.4 1520 - Local File Inclusion
author: 0x_Akoko
...