{"id":1360,"date":"2016-05-17T08:39:07","date_gmt":"2016-05-17T06:39:07","guid":{"rendered":"https:\/\/dev.sicherheitsforum.ch\/?p=1360"},"modified":"2023-03-14T08:57:20","modified_gmt":"2023-03-14T07:57:20","slug":"verteidigungslinie-gegen-ddos-attacken","status":null,"type":"post","link":"https:\/\/news.save.ch\/fr\/verteidigungslinie-gegen-ddos-attacken\/","title":{"rendered":"Ligne de d\u00e9fense contre les attaques DDoS"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1361 size-medium\" src=\"https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Verteidigungslinie-gegen-DDoS-Attacken-it-security.jpg\" width=\"680\" height=\"510\" srcset=\"https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Verteidigungslinie-gegen-DDoS-Attacken-it-security.jpg 1000w, https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Verteidigungslinie-gegen-DDoS-Attacken-it-security-375x281.jpg 375w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" \/><\/p>\n<p>Des gouvernements, des autorit\u00e9s, des fournisseurs de boutiques en ligne, des banques et de nombreuses autres entreprises ont d\u00e9j\u00e0 \u00e9t\u00e9 victimes d'attaques DDoS. Nombre d'entre elles ont d\u00fb payer le prix fort, par exemple en voyant leur site web bloqu\u00e9 ou leur centre de donn\u00e9es interrompu ; certaines ont m\u00eame d\u00fb payer une ran\u00e7on en raison du chantage exerc\u00e9 par les attaquants, comme <a href=\"https:\/\/www.nttcomsecurity.ch\" target=\"_blank\" data-cke-saved-href=\"https:\/\/www.nttcomsecurity.ch\" rel=\"noopener\">NTT Com S\u00e9curit\u00e9<\/a> \u00e9crit-il. Il ne faut pas s'attendre \u00e0 une am\u00e9lioration, car l'ampleur et le type des attaques DDoS augmentent.<\/p>\n<p><strong>Trois types d'attaques, trois niveaux de protection<\/strong><\/p>\n<p>Dans l'ensemble, NTT Com Security distingue trois types fondamentaux d'attaques DDoS. Il s'agit premi\u00e8rement des attaques classiques \u00e0 haut volume qui inondent les lignes Internet des victimes ; deuxi\u00e8mement, des attaques de plus en plus fr\u00e9quentes sur les composants de l'infrastructure, comme la surcharge des pare-feux ou des serveurs ; et troisi\u00e8mement, des attaques ax\u00e9es sur les applications qui peuvent avoir lieu au sein d'une connexion crypt\u00e9e et qui coupent la connexion aux serveurs d'applications.<\/p>\n<p>En fonction de ces attaques, les types de d\u00e9fense sont \u00e9galement diff\u00e9rents. L'entreprise de s\u00e9curit\u00e9 recommande une protection \u00e0 trois niveaux :<\/p>\n<p><em>1. d\u00e9fense contre les attaques \u00e0 haut volume :<\/em>\u00a0Dans ce cas, la protection n'est possible que par le biais de fournisseurs d'acc\u00e8s pouvant mettre \u00e0 disposition une large bande passante ou de centres de scrubbing. Les CDN (Content Delivery Networks) ne suffisent souvent plus face au volume \u00e9lev\u00e9 d'attaques DDoS ; les centres de scrubbing, \u00e9galement propos\u00e9s par NTT, repr\u00e9sentent un niveau de protection suppl\u00e9mentaire et sont plac\u00e9s en amont des syst\u00e8mes des entreprises. Il s'agit d'une sorte de centre de nettoyage \u00e9quip\u00e9 pour traiter des volumes de donn\u00e9es extr\u00eames, analyser le trafic et filtrer les diff\u00e9rents types d'attaques.<\/p>\n<p><em>2. d\u00e9fense contre les attaques d'infrastructure :\u00a0<\/em>En principe, ce type d'attaque peut \u00e9galement \u00eatre intercept\u00e9 par des centres de scrubbing. Mais si le nombre de connexions \u00e0 partir duquel un centre de scrubbing devient actif n'est pas atteint, l'utilisation de pare-feu DDoS-aware est plus appropri\u00e9e. Ils peuvent traiter nettement plus de connexions que les pare-feu classiques et interceptent ainsi les attaques correspondantes.<\/p>\n<p><em>3. d\u00e9fense contre les attaques centr\u00e9es sur les applications :<\/em>\u00a0Dans ce cas, l'outil de choix s'appelle WAF, c'est-\u00e0-dire Web Application Firewall. Par rapport aux pare-feu classiques, les WAF examinent la communication sp\u00e9cifique \u00e0 l'application et sont donc en mesure de d\u00e9tecter les attaques qui visent l'application.<\/p>\n<p><strong>Proc\u00e9der par \u00e9tapes<\/strong><\/p>\n<p>Si une entreprise se penche sur la d\u00e9fense contre d'\u00e9ventuelles attaques DDoS, elle devrait proc\u00e9der en plusieurs \u00e9tapes :<\/p>\n<p><em>1. analyse de l'existant :<\/em>\u00a0La premi\u00e8re mesure consiste \u00e0 v\u00e9rifier s'il existe d\u00e9j\u00e0 des syst\u00e8mes pouvant \u00eatre utilis\u00e9s pour la protection et comment les compl\u00e9ter au mieux afin de garantir la meilleure d\u00e9fense possible contre les DDoS. Les WAF, par exemple, ne sont pas tr\u00e8s fr\u00e9quents dans les entreprises, et la protection par scrubbing center est tr\u00e8s rare.<\/p>\n<p><em>2e monitoring :<\/em>\u00a0Les entreprises ne savent souvent pas qu'elles sont attaqu\u00e9es. Le pare-feu enregistre certes toutes les connexions, mais le nombre \u00e9lev\u00e9 d'entr\u00e9es rend une surveillance \u00e0 ce niveau pratiquement impossible, du moins manuellement. Les outils de surveillance des performances sont plus adapt\u00e9s, mais ils sont en g\u00e9n\u00e9ral trop rarement consult\u00e9s pour pouvoir se faire une id\u00e9e de l'\u00e9tat r\u00e9el de l'infrastructure. Des attaques DDoS de grande envergure sont \u00e9galement men\u00e9es r\u00e9guli\u00e8rement pour d\u00e9tourner l'attention de l'intrusion r\u00e9elle avec quelques paquets, par exemple sur un serveur. Pour d\u00e9tecter de telles attaques, un syst\u00e8me SIEM bien d\u00e9velopp\u00e9 est n\u00e9cessaire.<\/p>\n<p><em>3. processus de r\u00e9ponse :\u00a0<\/em>Que faire en cas d'attaque ? Une entreprise doit pr\u00e9parer les mesures correspondantes afin de pouvoir r\u00e9agir rapidement et de mani\u00e8re ad\u00e9quate. D\u00e8s le premier test d'attaquants DDoS, une entreprise devrait \u00eatre en mesure de passer en mode d'urgence et d'activer imm\u00e9diatement un service de scrubbing, par exemple.<\/p>\n<p><strong>L'accent se d\u00e9place <\/strong><\/p>\n<p>\"Les DDoS sont g\u00e9n\u00e9ralement associ\u00e9s \u00e0 des attaques de serveurs Web, mais les op\u00e9rateurs de serveurs Web sont d\u00e9sormais tr\u00e8s bien \u00e9quip\u00e9s pour les contrer\", explique Tom Hager de NTT Com Security. \"Mais les attaques sur l'infrastructure des entreprises sont nettement plus lourdes de cons\u00e9quences et devraient se multiplier \u00e0 l'avenir, car les entreprises y sont nettement moins bien prot\u00e9g\u00e9es. Si la logistique ou le syst\u00e8me de commande s'effondre et qu'il n'y a plus de communication ou de connexion avec les partenaires, l'entreprise peut \u00eatre paralys\u00e9e. Il est donc indispensable de se pr\u00e9parer en cons\u00e9quence\".<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Regierungen, Beh\u00f6rden, Online-Shop-Anbieter, Banken und viele andere Unternehmen waren bereits Opfer von DDoS-Angriffen. Viele mussten einen hohen Preis zahlen, etwa mit dem Absturz ihrer Website oder der Unterbrechung des Rechenzentrumbetriebs; manche sogar L\u00f6segeld, weil sie von den Angreifern erpresst wurden, wie NTT Com Security schreibt. Mit einer Besserung sei nicht zu rechnen, denn Umfang und [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1361,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[3313],"tags":[96,62,63],"class_list":["post-1360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-digitalisierung","tag-cyber-crime","tag-ict-sicherheit","tag-it-security"],"acf":[],"hkrextid":null,"publication":null,"issue":null,"workflow":null,"startPage":null,"spitzmarke":null,"_posts_by_tag_page_fields":{"widget_title":"","widget_tags":""},"_at_widget":"1","_yoast_wpseo_primary_category":"2","_yoast_wpseo_focuskw_text_input":"DDoS-Attacken","_yoast_wpseo_opengraph-image":"https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Verteidigungslinie-gegen-DDoS-Attacken-it-security.jpg","_yoast_wpseo_opengraph-description":"Nur wenige Unternehmen reagieren ad\u00e4quat auf die steigende Gefahr von DDoS-Attacken. NTT Com Security z\u00e4hlt die typischen Angriffsvarianten auf \u2013 und die angemessenen Gegenmassnahmen.","_yoast_wpseo_opengraph-title":"Verteidigungslinie gegen DDoS-Attacken","enclosure":null,"_yoast_wpseo_twitter-title":null,"_yoast_wpseo_twitter-description":null,"_yoast_wpseo_twitter-image":null,"_wp_old_slug":null,"_yoast_wpseo_title":null,"_yoast_wpseo_canonical":null,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Verteidigungslinie gegen DDoS-Attacken - Save<\/title>\n<meta name=\"description\" content=\"Nur wenige Unternehmen reagieren ad\u00e4quat auf die steigende Gefahr von DDoS-Attacken.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.save.ch\/fr\/verteidigungslinie-gegen-ddos-attacken\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Verteidigungslinie gegen DDoS-Attacken\" \/>\n<meta property=\"og:description\" content=\"Nur wenige Unternehmen reagieren ad\u00e4quat auf die steigende Gefahr von DDoS-Attacken. 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