Ensure kadm5.acl is owned by root and not writable by group or others

AltaNivel 1Automatizadakerberos

Descripción

kadm5.acl decides which principals may administer the Kerberos database; whoever can edit it can grant themselves full kadmin rights. Checks /etc/krb5kdc/kadm5.acl (Debian/Ubuntu) and /var/kerberos/krb5kdc/kadm5.acl (RHEL, default 600 root): owner root, no group or other write.

Cómo se verifica

Método de auditoría: Comando de shell

shell

n=0; bad=0
for f in /etc/krb5kdc/kadm5.acl /var/kerberos/krb5kdc/kadm5.acl; do
  [ -f "$f" ] || continue
  n=$((n+1))
  o=$(stat -Lc %U "$f") || exit 1
  [ "$o" = root ] || { echo "$f owned by $o"; bad=1; }
  [ -z "$(find -L "$f" -maxdepth 0 -perm /022)" ] || { echo "$f is group/other writable"; bad=1; }
done
[ "$n" -gt 0 ] && [ "$bad" -eq 0 ] && echo compliant

Salida esperada: compliant

Cómo se corrige

Método de corrección: Comando de shell

shell

for f in /etc/krb5kdc/kadm5.acl /var/kerberos/krb5kdc/kadm5.acl; do if [ -f "$f" ]; then chown root:root "$f" && chmod 600 "$f" || exit 1; fi; done

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: kerberoskdcpermissions
Referencia: CIS MIT Kerberos / Linux Benchmark guidance - KDC configuration file permissions (verify section number for your release)

Verificar este host

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

shell

tmaegis scan --target kerberos