{"id":7590,"date":"2019-05-08T16:58:39","date_gmt":"2019-05-08T20:58:39","guid":{"rendered":"https:\/\/www.cscdigitalbrand.services\/blog\/?p=7590"},"modified":"2022-07-20T10:43:52","modified_gmt":"2022-07-20T14:43:52","slug":"dns-une-composante-fondamentale-trop-souvent-negligee-1e-partie","status":"publish","type":"post","link":"https:\/\/www.cscdbs.com\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-1e-partie\/","title":{"rendered":"DNS : Une composante fondamentale trop souvent n\u00e9glig\u00e9e, 1e partie \u2013 Qu\u2019est-ce que le DNS et pourquoi est-il vuln\u00e9rable ?"},"content":{"rendered":"\n<p><i>par Ken Linscott<\/i><\/p>\n\n\n\n<p>Le syst\u00e8me de noms de domaine&nbsp;\u2013 ou DNS&nbsp;\u2013 est l\u2019infrastructure n\u00e9cessaire au bon fonctionnement d\u2019Internet. Les professionnels de l\u2019informatique savent que la technologie&nbsp;DNS est la composante de base de la pr\u00e9sence en ligne d\u2019une entreprise. <\/p>\n\n\n\n<p>Les sites web poss\u00e8dent chacun une adresse&nbsp;IP\n(Internet Protocol) qui correspond \u00e0 un num\u00e9ro unique. Le DNS traduit les noms\nde site&nbsp;\u2013 \u00e9crits en langage humain&nbsp;\u2013 en adresses&nbsp;IP pour\nfaciliter leur gestion par les ordinateurs. <\/p>\n\n\n\n<p>Dans cette premi\u00e8re partie de notre s\u00e9rie de billets de\nblog sur le DNS, nous expliquons pourquoi, quel que soit le type d\u2019entreprise,\nun DNS fiable est essentiel pour la pr\u00e9sence en ligne d\u2019une marque, est\n\u00e9troitement li\u00e9 \u00e0 la r\u00e9ussite de ses activit\u00e9s en ligne et peut \u00e9galement aider\n\u00e0 pr\u00e9venir les attaques DNS. Lisez la suite pour savoir comment fonctionne le\nDNS.&nbsp; <\/p>\n\n\n\n<p><strong>DNS fiable&nbsp;=\nsucc\u00e8s de la marque et confiance des clients<\/strong><\/p>\n\n\n\n<p>Le Saint Graal du DNS est sa disponibilit\u00e9. Le probl\u00e8me,\npour les entreprises, r\u00e9side dans la vuln\u00e9rabilit\u00e9 du DNS, qui ouvre la porte \u00e0\nune foule de cyber-risques, ainsi que dans les co\u00fbts associ\u00e9s aux mesures de\nprotection r\u00e9sultant de cette vuln\u00e9rabilit\u00e9.<\/p>\n\n\n\n<p>Les cyberattaques r\u00e9centes mettent en lumi\u00e8re les\ntechniques sp\u00e9cifiques utilis\u00e9es par les individus malveillants pour\nintercepter et manipuler le trafic web l\u00e9gitime d\u2019une entreprise, r\u00e9colter des\ninformations comme les identifiants ou les adresses e-mail, et commettre\nd\u2019autres activit\u00e9s hostiles, comme le hame\u00e7onnage (\u00ab&nbsp;phishing&nbsp;\u00bb).\nDans certains cas, des certificats de s\u00e9curit\u00e9 num\u00e9riques gratuits, qui\nrequi\u00e8rent une validation de faible niveau, sont \u00e9mis pour rendre les\ntentatives d\u2019escroquerie (les \u00ab&nbsp;scams&nbsp;\u00bb) plus cr\u00e9dibles, ce qui\namplifie le probl\u00e8me pour les marques comme pour leurs clients. Les clients\ncraignent que leurs donn\u00e9es personnelles soient accessibles et vol\u00e9es par des\ncriminels. Ce type de failles de s\u00e9curit\u00e9 impacte donc la r\u00e9putation et le\nchiffre d&#8217;affaires d\u2019entreprises dans le monde entier.<\/p>\n\n\n\n<p>En cas de dysfonctionnement du DNS, les clients qui veulent\nconsulter un site web ne pourront tout simplement pas y acc\u00e9der. Parall\u00e8lement,\nles employ\u00e9s de l\u2019entreprise ne pourront ni envoyer, ni recevoir des e-mails.\nSi l\u2019entreprise utilise la Technologie VoIP (Voice-over-IP) pour passer des\nappels, en cas de panne de DNS, l\u2019acc\u00e8s est coup\u00e9, et l\u2019entreprise devra\nutiliser les lignes fixes ou les t\u00e9l\u00e9phones portables pour joindre ses clients.\nEnfin, la capacit\u00e9 des t\u00e9l\u00e9travailleurs \u00e0 acc\u00e9der aux syst\u00e8mes via le\nr\u00e9seau&nbsp;VPN dispara\u00eet, ce qui prive l\u2019entreprise de ressources pr\u00e9cieuses\nau moment pr\u00e9cis o\u00f9 elle a besoin de son personnel au complet.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"577\" src=\"https:\/\/www.cscdigitalbrand.services\/blog\/wp-content\/uploads\/2019\/05\/Slide-1-French-1024x577.png\" alt=\"\" class=\"wp-image-7591\" srcset=\"https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-1-French-1024x577.png 1024w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-1-French-300x169.png 300w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-1-French-768x432.png 768w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-1-French.png 1316w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Comment fonctionne\nle DNS<br \/>\n<\/strong>Les requ\u00eates Internet arrivent d\u2019abord chez le\nfournisseur de services Internet (FAI), et si l\u2019adresse&nbsp;IP est mise en\ncache chez le FAI, l\u2019ordinateur effectue la r\u00e9solution vers le bon emplacement.\nSi l\u2019adresse&nbsp;IP n\u2019est pas en cache chez le FAI, celui-ci va interroger la\nracine du DNS qui lui indique le bon registre \u00e0 consulter. Ce registre indique\nalors aux ordinateurs quels serveurs DNS font autorit\u00e9 pour savoir o\u00f9 est\nh\u00e9berg\u00e9 le contenu.<\/p>\n\n\n\n<p>Il s&#8217;agit d\u2019un cheminement complexe, mais qui s\u2019effectue\nd\u2019ordinaire en un clin d\u2019\u0153il et sans probl\u00e8me particulier. Toutefois, c\u2019est\ncette complexit\u00e9, et notamment les multiples points de d\u00e9faillance potentielle,\nqui permet aux pirates de compromettre le processus et de voler\/rediriger le\ntrafic vers des sites web frauduleux.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.cscdigitalbrand.services\/blog\/wp-content\/uploads\/2019\/05\/Slide-2-French-1024x575.png\" alt=\"\" class=\"wp-image-7592\" srcset=\"https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-2-French-1024x575.png 1024w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-2-French-300x168.png 300w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-2-French-768x431.png 768w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Slide-2-French.png 1320w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Prochain billet<\/strong><\/p>\n\n\n\n<p>Dans notre prochain billet, nous d\u00e9taillerons cinq vuln\u00e9rabilit\u00e9s&nbsp;DNS cibl\u00e9es par les auteurs d\u2019actes malveillants. <a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/email-sign-up\/\">Abonnez-vous \u00e0 notre blog pour recevoir les notifications de publication des nouveaux billets.<\/a><\/p>\n\n\n\n<p><strong>D\u2019autres billets de la s\u00e9rie&nbsp;:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-2e-partie\/\">&gt;&gt;&nbsp;2e Partie \u2013 Les quatre vuln\u00e9rabilit\u00e9s DNS que vous devez conna\u00eetre<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-3e-partie\/\">&gt;&gt; 3e Partie \u2013 Six vuln\u00e9rabilit\u00e9s DNS suppl\u00e9mentaires qui rendent la s\u00e9curit\u00e9 essentielle<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-4e-partie\/\">&gt;&gt;4e Partie \u2013 La menace croissante des piratages DNS et du domain-shadowing<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-5e-partie\/\">&gt;&gt;\n5e Partie &#8211; Att\u00e9nuer les risques de 10 vuln\u00e9rabilit\u00e9s DNS importantes<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>par Ken Linscott Le syst\u00e8me de noms de domaine&nbsp;\u2013 ou DNS&nbsp;\u2013 est l\u2019infrastructure n\u00e9cessaire au bon fonctionnement d\u2019Internet. Les professionnels de l\u2019informatique savent que la technologie&nbsp;DNS est la composante de base de la pr\u00e9sence en ligne d\u2019une entreprise. Les sites web poss\u00e8dent chacun une adresse&nbsp;IP (Internet Protocol) qui correspond \u00e0 un num\u00e9ro unique. Le DNS [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[545],"tags":[],"class_list":["post-7590","post","type-post","status-publish","format-standard","hentry","category-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DNS : Une composante fondamentale trop souvent n\u00e9glig\u00e9e, 1e partie \u2013 Qu\u2019est-ce que le DNS et pourquoi est-il vuln\u00e9rable ? | CSC<\/title>\n<meta name=\"description\" content=\"par Ken Linscott Le syst\u00e8me de noms de domaine&nbsp;\u2013 ou DNS&nbsp;\u2013 est l\u2019infrastructure n\u00e9cessaire au bon fonctionnement d\u2019Internet. Les professionnels\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cscdbs.com\/blog\/dns-une-composante-fondamentale-trop-souvent-negligee-1e-partie\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DNS : Une composante fondamentale trop souvent n\u00e9glig\u00e9e, 1e partie \u2013 Qu\u2019est-ce que le DNS et pourquoi est-il vuln\u00e9rable ? | CSC\" \/>\n<meta property=\"og:description\" content=\"par Ken Linscott Le syst\u00e8me de noms de domaine&nbsp;\u2013 ou DNS&nbsp;\u2013 est l\u2019infrastructure n\u00e9cessaire au bon fonctionnement d\u2019Internet. 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