According to the question, the permission set requires setting SID with the owner and the group.
Moreover, the Read, Write, and Execute permissions on the script file are required for the owner, Read and Execute permissions for the group, and Read permission for others.
The chmod command is used to change the permissions. The last three digits, i.e., 754 will provide the required permissions to the owner, group, and others. The digit 7 will provide the Read, Write, and Execute permissions to the owner.
The digit 5 will provide the Read and
Execute permissions to the group. The digit 4 will provide the Read permission to others.
According to the question, you have to set SID for the owner and users. For the owner (SUID), you will have to add 4 as a prefix to the permission number. For the group (SGID), you will have to add 2 as a prefix to it. For setting both the
SIDs (SUID and SGID), you will have to add 6 as a prefix to the permission set. Hence, in order to accomplish the task, you will have to run the following command:
chmod 6754
This will set the SID for the owner and group on the permission set of the lf.cgi script file. When SID is set, the Execute permission symbol x is replaced with s.
