Introduce XSS-Validation

/exlibris/aleph/u23_1/alephe/tab/tab100 set XSS-VALIDATION to 'Y': 

XSS-VALIDATION=Y 

See article

Security scans on Aleph 23 server complain about XSS Validation - Ex Libris Knowledge Center (exlibrisgroup.com)

Avoid uncertified relocate

With the default Apache configuration it is possible to relocate to a different page using option /goto. 
How to avoid this situation see instructions in article  Web OPAC /goto uncertified relocate - Ex Libris Knowledge Center (exlibrisgroup.com)

Secure PDS

Follow the instructions of sections

• X-Server Security Patch
• Securing the PDS_HANDLE Cookie

documented in the Patron Directory Services Guide (https://knowledge.exlibrisgroup.com/@api/deki/files/26589/Patron_Directory_Services_Guide.pdf?revision=6)

Deactivate PDS on Aleph server

set the relevant line in $alephe_tab/tab100 to PDS-AWARE=N

Turn off the Web OPAC

a. Block the Web OPAC (through firewall) or add a line to the file $alephe_tab/server_ip_allowed

W D *.*.*.*

Explanation from table header

! COL   1.   1; ALPHA{W,P,N}, UPPER; ;
!               Server type;
!               Server type:
!               W = WWW web server
!               X = X-Server (part of WWW web server services)
!               P = PC server
!               N = NCIP server;
! COL   2.   1; ALPHA{A,D}, UPPER; ;
!               Access permission;
!               Access permission:
!               A - Allowed
!               D - Denied;

Note: if you are using a discovery system, add the IP address to file $alephe_tab/server_ip_allowed as follows. In this case please ignore the next sections (b+c).

Example
W A 123.123.456.456 

b. Stop the WWW Server

In case you are using the X-Server for communication with your discovery system (e.g. Primo) the WWW server should not be stopped.

• Connect to your Aleph server (using ssh)

• dlib xxx01

• Util W / 2. Stop Servers / 2.  WWW Server to stop the WWW Server

c. Deactivate the automatic startup of the WWW Server

Remove the following section from $alephe_root/aleph_startup configuration

       if  (! $?WWW_START_HOST) then
            echo "starting www_server...."
            csh -f $aleph_proc/www_server $l_www_server_port $l_httpd_port $l_n_of_servers >& /dev/null &
            echo " "
        else
            foreach thishost ($WWW_START_HOST)
                if  ($thishost == $THIS_HOST) then
                    echo "starting www_server...."
                    csh -f $aleph_proc/www_server $l_www_server_port $l_httpd_port $l_n_of_servers >& /dev/null &
                    echo " "
                endif
            end
        endif