Ensure access to /etc/ssh/ssh_banner is configured

BajaNivel 1Automatizadaaix

Descripción

The contents of the /etc/ssh/ssh_banner file are displayed to users prior to login for connections via SSH. -IF- the /etc/ssh/ssh_banner 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; ACLs are not evaluated.

Cómo se verifica

Método de auditoría: Comando de shell

shell

r=compliant; for f in /etc/ssh/ssh_banner; 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='system' '{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: $s"; else r="$f: missing"; 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/ssh/ssh_banner: # chown root:system /etc/ssh/ssh_banner # chmod u=rw,go=r /etc/ssh/ssh_banner

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: aixssh
Referencia: CIS IBM AIX 7 Benchmark v1.2.0 - 4.1.1.7 Ensure access to /etc/ssh/ssh_banner 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 aix