Ensure access to /etc/motd is configured

BajaNivel 1Automatizadafreebsd

Descripción

The contents of the /etc/motd file are displayed to users after login and function as a message of the day for authenticated users. -IF- the /etc/motd file does not have the correct access configured, it could be modified by unauthorized users with incorrect or misleading information. Audit: compares `ls -ld` mode (this mode or more restrictive), owner and group with the CIS values.

Cómo se verifica

Método de auditoría: Comando de shell

shell

r=compliant; for f in /etc/motd; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='rw-r--r--' -v o='root' -v g='wheel' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; echo "$r"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Run the following commands to set mode, owner, and group on /etc/motd: # chown root:wheel $(readlink -f /etc/motd) # chmod u-x,go-wx $(readlink -f /etc/motd) -OR- Run the following command to remove the /etc/motd file: # rm /etc/motd

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: freebsdpermissions
Referencia: CIS FreeBSD 14 Benchmark v1.0.1 - 1.6.4 Ensure access to /etc/motd is configured

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target freebsd