{"id":136,"date":"2020-11-29T09:37:05","date_gmt":"2020-11-29T08:37:05","guid":{"rendered":"https:\/\/parlonstechs.com\/all\/?p=136"},"modified":"2020-11-29T09:39:28","modified_gmt":"2020-11-29T08:39:28","slug":"une-nouvelle-faille-dns-permet-dusurper-lidentite-de-nimporte-quel-site","status":"publish","type":"post","link":"https:\/\/parlonstechs.com\/all\/2020\/11\/29\/une-nouvelle-faille-dns-permet-dusurper-lidentite-de-nimporte-quel-site\/","title":{"rendered":"Une nouvelle faille DNS permet d\u2019usurper l&rsquo;identit\u00e9 de n\u2019importe quel site"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/img-s-msn-com.akamaized.net\/tenant\/amp\/entityid\/BB1b2xtb.img?h=493&amp;w=874&amp;m=6&amp;q=60&amp;o=f&amp;l=f\" alt=\"Une nouvelle faille DNS permet d\u2019usurper l'identit\u00e9 de n\u2019importe quel site\"\/><\/figure>\n\n\n\n<p style=\"font-size:24px\"><strong>Des chercheurs ont trouv\u00e9 un canal auxiliaire qui remet au go\u00fbt du jour ce type d\u2019attaque que l\u2019on croyait \u00e9limin\u00e9e depuis douze ans.<\/strong><\/p>\n\n\n\n<p>C\u2019est un peu un retour vers l\u2019an de gr\u00e2ce\u00a02008. Cette ann\u00e9e, le chercheur en s\u00e9curit\u00e9\u00a0<strong>Daniel Kaminsky<\/strong>\u00a0avait r\u00e9v\u00e9l\u00e9 une m\u00e9chante faille dans le syst\u00e8me DNS, permettant \u00e0 un pirate d\u2019usurper l\u2019identit\u00e9 de n\u2019importe quel site. L\u2019attaque, appel\u00e9e \u00ab\u00a0DNS Cache Poisoning\u00a0\u00bb, s\u2019appuyait sur le fait qu\u2019il \u00e9tait assez simple de forger une fausse r\u00e9ponse \u00e0 une requ\u00eate DNS l\u00e9gitime. Il suffisait de \u00ab\u00a0bruteforcer\u00a0\u00bb l\u2019identifiant de transaction en envoyant plein de r\u00e9ponses qui faisaient varier ce champ de donn\u00e9es. Cet identifiant est cod\u00e9 sur 16\u00a0bits, ce qui signifie qu\u2019il y avait au maximum 65\u00a0536\u00a0possibilit\u00e9s. Si la connexion de l\u2019attaquant \u00e9tait bonne, la v\u00e9ritable r\u00e9ponse arrivait trop tard et pouvait \u00eatre rejet\u00e9e.<\/p>\n\n\n\n<p>Cette attaque n\u2019est plus possible, car les r\u00e9solveurs DNS choisissent d\u00e9sormais le port source de la requ\u00eate au hasard. Un attaquant devrait donc non seulement bruteforcer l\u2019identifiant de connexion (16 bits), mais aussi le port source (16 bits). Le nombre de possibilit\u00e9s est d\u00e9sormais trop \u00e9lev\u00e9 pour que l\u2019attaque soit r\u00e9alisable.<\/p>\n\n\n\n<p>Mais un groupe de chercheurs de Tsinghua University et University of California vient maintenant de r\u00e9v\u00e9ler une nouvelle m\u00e9thode. Baptis\u00e9e \u00ab&nbsp;SAD DNS&nbsp;\u00bb (Side Channel AttackeD DNS), elle s\u2019appuie sur le fait qu\u2019il est possible de tester l\u2019existence d\u2019un port ouvert sur un r\u00e9solveur en lui envoyant un simple paquet UDP. Si le port est ouvert, aucune r\u00e9ponse n\u2019est envoy\u00e9e. S\u2019il est ferm\u00e9, l\u2019appareil \u00e9met un message ICMP Reply pour indiquer une erreur.<\/p>\n\n\n\n<p>Pour \u00e9viter les scans automatis\u00e9s, le nombre de r\u00e9ponses ICMP est limit\u00e9 dans le temps (50 toutes les 20&nbsp;ms) et par adresse IP source (1 par seconde). Dans ces conditions, impossible de r\u00e9aliser un scan directement. Mais les chercheurs ont r\u00e9ussi \u00e0 d\u00e9velopper une technique qui permet de r\u00e9v\u00e9ler ce port source de fa\u00e7on indirecte, en observant le comportement de ces r\u00e9ponses ICMP.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Un grand nombre de r\u00e9solveurs sont vuln\u00e9rables<\/h3>\n\n\n\n<p>Les chercheurs ont ensuite analys\u00e9 14&nbsp;r\u00e9solveurs publics dont Google, Cloudflare, Dyn et OpenDNS. R\u00e9sultat&nbsp;: seuls deux n\u2019\u00e9taient pas vuln\u00e9rables \u00e0 cette attaque, \u00e0 savoir Tencent DNS et Ali DNS. Les chercheurs ont \u00e9galement analys\u00e9 plus 138&nbsp;000&nbsp;r\u00e9solveurs dits \u00ab&nbsp;ouverts&nbsp;\u00bb (librement accessibles, mais peu connus). Parmi, 34&nbsp;% \u00e9taient vuln\u00e9rables.<\/p>\n\n\n\n<p>La bonne nouvelle, c\u2019est qu\u2019il existe plusieurs fa\u00e7ons de contrer cette attaque. Le noyau de Linux a d\u2019ores et d\u00e9j\u00e0 \u00e9t\u00e9 patch\u00e9 pour rendre al\u00e9atoire le plafond de r\u00e9ponses ICMP. On peut \u00e9galement d\u00e9sactiver les r\u00e9ponses ICMP. L\u2019usage du protocole DNSSEC coupe \u00e9galement l\u2019herbe sous le pied de cette attaque. Malheureusement, beaucoup de r\u00e9solveurs seront vuln\u00e9rables, le temps d\u2019appliquer l\u2019un de ces correctifs. C\u2019est pourquoi les chercheurs proposent un test sur leur site web qui permet de savoir si le r\u00e9solveur DNS que l\u2019on utilise est vuln\u00e9rable. Le cas \u00e9ch\u00e9ant, il faudra en choisir un autre. Le service de Cloudflare, pour sa part, n\u2019est plus vuln\u00e9rable.<\/p>\n\n\n\n<p><strong>Source<\/strong>:&nbsp;<a href=\"https:\/\/www.cs.ucr.edu\/~zhiyunq\/SADDNS.html\" target=\"_blank\" rel=\"noreferrer noopener\">University of California<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs ont trouv\u00e9 un canal auxiliaire qui remet au go\u00fbt du jour ce type d\u2019attaque que l\u2019on croyait \u00e9limin\u00e9e depuis douze ans. C\u2019est un peu un retour vers l\u2019an [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":138,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,11],"tags":[76],"class_list":["post-136","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-cybersecurite","tag-dns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Une nouvelle faille DNS permet d\u2019usurper l&#039;identit\u00e9 de n\u2019importe quel site - Parlons Techs - Store<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/parlonstechs.com\/all\/2020\/11\/29\/une-nouvelle-faille-dns-permet-dusurper-lidentite-de-nimporte-quel-site\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une nouvelle faille DNS permet d\u2019usurper l&#039;identit\u00e9 de n\u2019importe quel site - Parlons Techs - Store\" \/>\n<meta property=\"og:description\" content=\"Des chercheurs ont trouv\u00e9 un canal auxiliaire qui remet au go\u00fbt du jour ce type d\u2019attaque que l\u2019on croyait \u00e9limin\u00e9e depuis douze ans. 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