{"id":143686,"date":"2019-04-24T05:57:00","date_gmt":"2019-04-24T05:57:00","guid":{"rendered":"https:\/\/alliedtelesisprod.smmile.com\/8-etapes-pour-rendre-les-systemes-plus-surs\/"},"modified":"2026-05-29T17:47:21","modified_gmt":"2026-05-29T17:47:21","slug":"8-steps-making-systems-more-secure","status":"publish","type":"post","link":"https:\/\/alliedtelesisprod.smmile.com\/fr\/8-steps-making-systems-more-secure\/","title":{"rendered":"8 \u00e9tapes pour rendre les syst\u00e8mes plus s\u00fbrs"},"content":{"rendered":"<p>Aujourd&#8217;hui, nous assistons \u00e0 l&#8217;essor de&nbsp;<a data-entity-substitution=\"canonical\" data-entity-type=\"node\" data-entity-uuid=\"83b2d88b-8c1c-42c7-a8dc-3f8daa0d924c\" href=\"https:\/\/alliedtelesisprod.smmile.com\/fr\/designing-networks-iot\/\">l&#8217;Internet des Objets&nbsp;<\/a>ou IoT, o\u00f9 des milliards d&#8217;appareils sont de plus en plus connect\u00e9s \u00e0 Internet et partagent les informations et les donn\u00e9es qu&#8217;ils collectent. Il peut s&#8217;agir de dispositifs simples, tels qu&#8217;un thermostat ou une ampoule, ou de dispositifs plus complexes, tels que des cam\u00e9ras de vid\u00e9osurveillance et ce qu&#8217;on appelle des bacs intelligents.<\/p>\n<p>Cette interconnexion et cette capacit\u00e9 \u00e0 partager des informations peuvent apporter une intelligence et une efficacit\u00e9 inimaginables. Aujourd&#8217;hui, les b\u00e2timents peuvent optimiser leurs performances afin de s&#8217;assurer qu&#8217;ils r\u00e9pondent non seulement aux exigences de confort et de s\u00e9curit\u00e9 des occupants, mais \u00e9galement de satisfaire aux exigences l\u00e9gales ou environnementales en vigueur. Et il n\u2019est plus n\u00e9cessaire pour les services municipaux d\u2019envoyer des camions tous les jours ou plusieurs fois par jour pour vider les poubelles car celles-ci peuvent contenir plus de d\u00e9chets (ou de produits recyclables) gr\u00e2ce \u00e0 un compacteur int\u00e9gr\u00e9 et quand il arrive \u00e0 saturation, il contacte les services pour indiquer qu&#8217;il doit \u00eatre vid\u00e9. Ce sont deux exemples simples de la fa\u00e7on dont la connectivit\u00e9 et l&#8217;intelligence contribuent \u00e0 am\u00e9liorer les performances et l&#8217;efficacit\u00e9.<\/p>\n<p>Il y a toutefois un inconv\u00e9nient \u00e0 ce niveau croissant de connectivit\u00e9, qui est celui de la s\u00e9curit\u00e9. Compte tenu de l&#8217;explosion des p\u00e9riph\u00e9riques interconnect\u00e9s et de la sensibilit\u00e9 de bon nombre de ces p\u00e9riph\u00e9riques, il y a un besoin de s&#8217;assurer que ces p\u00e9riph\u00e9riques soient connect\u00e9s avec un niveau de s\u00e9curit\u00e9 \u00e9lev\u00e9.<\/p>\n<p>Pour prendre exemple de ce qui pourrait \u00e9ventuellement mal tourner lorsque les personnes mal intentionn\u00e9es sont en mesure de prendre le contr\u00f4le d&#8217;un environnement IoT, regardez le film Die Hard 4.0 avec Bruce Willis. Bien qu&#8217;un peu dat\u00e9 d\u2019aujourd\u2019hui, le film illustre ce qui pourrait arriver si des attaquants pouvaient prendre le contr\u00f4le de b\u00e2timents et d\u2019infrastructures critiques telles que les syst\u00e8mes de contr\u00f4le de la circulation.<\/p>\n<p>Bien que ce film paraisse peu r\u00e9aliste dans sa description de ce que des hackers comp\u00e9tants pourraient potentiellement accomplir, il est important de comprendre que la s\u00e9curit\u00e9 comprend une s\u00e9rie de contre-mesures visant \u00e0 r\u00e9duire ou \u00e0 att\u00e9nuer \u00e0 la fois la probabilit\u00e9 d&#8217;une attaque et la gravit\u00e9 de l&#8217;attaque. Et bien que cela puisse sembler relever du bon sens, de nombreuses t\u00e2ches r\u00e9guli\u00e8res ou courantes qui permettraient l&#8217;am\u00e9lioration de la s\u00e9curit\u00e9 ne sont toujours pas mises en \u0153uvre. Voyons quelques-unes d\u2019entre elles.<\/p>\n<ol>\n<li><strong>Changer les noms d&#8217;utilisateur et mots de passe par d\u00e9faut.<\/strong>&nbsp;La plupart, sinon tous les appareils, ont des noms d&#8217;utilisateur et des mots de passe par d\u00e9faut qui peuvent \u00eatre facilement trouv\u00e9s par un enfant \u00e0 l&#8217;aide d&#8217;un moteur de recherche. Les mots de passe par d\u00e9faut doivent \u00eatre chang\u00e9s imm\u00e9diatement et m\u00eame mieux, vous devez \u00e9galement modifier, supprimer ou d\u00e9sactiver le nom d&#8217;utilisateur par d\u00e9faut.<\/li>\n<li><strong>Ne partagez pas les mots de passe.<\/strong>&nbsp;haque utilisateur d&#8217;un syst\u00e8me doit avoir son propre nom d&#8217;utilisateur et mot de passe. Cela garantit que lorsque cet utilisateur quitte l&#8217;organisation, son compte peut simplement \u00eatre d\u00e9sactiv\u00e9 ou supprim\u00e9 et il n&#8217;est ainsi pas n\u00e9cessaire de modifier les identifiants du compte partag\u00e9 pour chaque syst\u00e8me auquel l&#8217;utilisateur avait acc\u00e8s (ce qui en r\u00e9alit\u00e9 ne se produit pas).<\/li>\n<li><strong>Utilisez une authentification forte.<\/strong>&nbsp;L&#8217;utilisation de mots de passe forts de longueur raisonnable, combinant des lettres, des chiffres et des caract\u00e8res sp\u00e9ciaux, sans inclure de mots du dictionnaire, garantit que les mots de passe ne peuvent pas \u00eatre facilement d\u00e9couverts. Le mieux encore est d&#8217;utiliser des certificats num\u00e9riques avec les cl\u00e9s g\u00e9n\u00e9r\u00e9es dans un jeton ou un p\u00e9riph\u00e9rique, ce qui non seulement assure une authentification forte, mais \u00e9galement la non-r\u00e9pudiation.<\/li>\n<li><strong>Utilisez l&#8217;authentification centralis\u00e9e.<\/strong> L&#8217;utilisation d&#8217;un syst\u00e8me d&#8217;authentification centralis\u00e9 tel qu&#8217;Active Directory, RADIUS ou LDAP simplifie le processus de gestion des informations utilisateur, car il n&#8217;y a qu&#8217;un seul syst\u00e8me qui doit \u00eatre administr\u00e9 au lieu de plusieurs.<\/li>\n<li><strong>Restreindre l&#8217;acc\u00e8s.<\/strong>&nbsp;L&#8217;acc\u00e8s aux syst\u00e8mes doit \u00eatre limit\u00e9 au niveau minimum requis pour qu&#8217;un utilisateur puisse r\u00e9aliser les t\u00e2ches qu&#8217;il doit effectuer. De plus, les pares-feu doivent \u00eatre utilis\u00e9s pour s\u00e9parer et isoler les syst\u00e8mes de mani\u00e8re \u00e0 ce qu&#8217;un probl\u00e8me ou une attaque sur un syst\u00e8me ait moins de chances d\u2019en impacter d\u2019autres.<\/li>\n<li><strong>Int\u00e9grer la redondance.&nbsp;<\/strong>La redondance doit \u00eatre int\u00e9gr\u00e9e pour garantir que le syst\u00e8me continue de fonctionner en cas de panne ou d&#8217;attaque. Dans de nombreux cas, le montant de la perte de chiffre d&#8217; affaires est de loin sup\u00e9rieur au co\u00fbt suppl\u00e9mentaire de la redondance.<\/li>\n<li><strong>N&#8217;oubliez pas la s\u00e9curit\u00e9 physique.<\/strong> La s\u00e9curit\u00e9 concerne toutes les couches et l&#8217;une d&#8217;entre elles est l&#8217;acc\u00e8s physique. Si un attaquant peut obtenir un acc\u00e8s physique \u00e0 un syst\u00e8me, sa t\u00e2che sera simplifi\u00e9e. Par cons\u00e9quent, assurez-vous que l&#8217;acc\u00e8s physique n&#8217;est disponible que pour ceux qui en ont besoin.<\/li>\n<li><strong>Faire des sauvegardes r\u00e9guli\u00e8res.<\/strong> A n&#8217;importe quel moment, il peut y avoir un incident. Et lorsque cela se produit, il est important que vous disposiez d\u2019une sauvegarde hors ligne et stock\u00e9e dans un lieu diff\u00e9rent.<\/li>\n<\/ol>\n<p>Bien que ces \u00e9tapes puissent sembler simples et de bon sens, il existe aujourd&#8217;hui de nombreux syst\u00e8mes IoT o\u00f9 le niveau de s\u00e9curit\u00e9 utilis\u00e9 laisse beaucoup \u00e0 d\u00e9sirer. Beaucoup d&#8217;autres choses peuvent \u00eatre mises en \u0153uvre, mais le fait de suivre chacune des \u00e9tapes ci-dessus contribuera grandement \u00e0 am\u00e9liorer la s\u00e9curit\u00e9 des syst\u00e8mes d\u00e9ploy\u00e9s aujourd&#8217;hui.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post discusses several network security best practices to reduce the risk of insider attacks and cyber attacks.<\/p>\n","protected":false},"author":3,"featured_media":116999,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"location":[],"markets":[],"partners":[],"posttype":[7993],"products":[],"services":[],"solutions":[],"site_tags":[8156,8145],"technologies":[],"class_list":["post-143686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","posttype-blogpost","site_tags-cybersecurity","site_tags-networksecurity"],"acf":[],"yoast_head":"<!-- This site is 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