{"id":420,"date":"2023-10-17T08:52:06","date_gmt":"2023-10-17T08:52:06","guid":{"rendered":"https:\/\/newblog.siteground.com\/fr\/?p=420"},"modified":"2025-10-03T08:06:53","modified_gmt":"2025-10-03T08:06:53","slug":"reponse-a-la-reinitialisation-rapide-du-http-2-laction-rapide-de-siteground-face-a-une-nouvelle-vulnerabilite","status":"publish","type":"post","link":"https:\/\/fr.siteground.com\/blog\/reponse-a-la-reinitialisation-rapide-du-http-2-laction-rapide-de-siteground-face-a-une-nouvelle-vulnerabilite\/","title":{"rendered":"R\u00e9ponse \u00e0 la r\u00e9initialisation rapide du HTTP\/2 : L’action rapide de SiteGround face \u00e0 une nouvelle vuln\u00e9rabilit\u00e9"},"content":{"rendered":"\n

Dans le monde dynamique de la cybers\u00e9curit\u00e9, il n’est pas rare de rencontrer de nouveaux d\u00e9fis. R\u00e9cemment, une nouvelle vuln\u00e9rabilit\u00e9, baptis\u00e9e “HTTP\/2 Rapid Reset”, a \u00e9t\u00e9 d\u00e9couverte. \u00c9tant donn\u00e9 que le HTTP\/2 est consid\u00e9r\u00e9 comme un protocole relativement nouveau, nous voyons chaque jour des moyens plus modernes et plus intelligents d’effectuer des attaques. Mais cette derni\u00e8re vuln\u00e9rabilit\u00e9 a le potentiel de perturber les services web \u00e0 une \u00e9chelle sans pr\u00e9c\u00e9dent.<\/p>\n\n\n\n

Avant d’entrer dans les d\u00e9tails, voyons ce que cela signifie pour les propri\u00e9taires de sites web.<\/p>\n\n\n\n

<\/span>Une attaque HTTP\/2 Rapid Reset, c’est quoi ?<\/span><\/h2>\n\n\n\n

Le HTTP\/2 est un protocole qui permet \u00e0 votre site web de se charger plus rapidement et de g\u00e9rer plus de visiteurs simultan\u00e9ment. Le HTTP\/2 permet aux clients de demander plusieurs ressources de site web (fichiers CSS, fichiers JS, images, etc.) avec une seule requ\u00eate. Cependant, des pirates astucieux ont trouv\u00e9 un moyen d’exploiter ce m\u00e9canisme. Ils ont mis au point une technique permettant d’envoyer une requ\u00eate \u00e0 un serveur, puis de l’annuler imm\u00e9diatement, en r\u00e9p\u00e9tant ce processus \u00e0 un rythme extr\u00eamement \u00e9lev\u00e9. Ce flux de requ\u00eates et d’annulations peut submerger un serveur, entra\u00eenant son ralentissement, voire son blocage – une attaque classique par d\u00e9ni de service (DoS). L’attaque ne surcharge pas seulement le serveur web offrant le HTTP\/2, mais aussi tous les backends qui sont \u00e9galement impliqu\u00e9s dans le traitement des demandes de site web – tels que les ex\u00e9cutions PHP, les serveurs d’application, la livraison de fichiers statiques, etc.<\/p>\n\n\n\n

Imaginez un centre d’appel et un interlocuteur qui compose le num\u00e9ro du centre d’appel et qui raccroche imm\u00e9diatement apr\u00e8s qu’un op\u00e9rateur ait pris l’appel. Les op\u00e9rateurs perdent un temps pr\u00e9cieux \u00e0 traiter les faux appels et ne peuvent pas r\u00e9pondre aux demandes l\u00e9gitimes. Le centre d’appel tout entier s’arr\u00eate et ne peut plus traiter les demandes des clients r\u00e9els. C’est exactement ce que cette nouvelle attaque provoque \u00e0 l’\u00e9chelle d’un serveur.<\/p>\n\n\n\n

<\/span>La r\u00e9ponse rapide de SiteGround<\/span><\/h2>\n\n\n\n

Chez SiteGround, nous essayons toujours d’avoir une longueur d’avance en termes de s\u00e9curit\u00e9 des sites web. Cette fois-ci ne fait pas exception, et nous avons \u00e9t\u00e9 parmi les premi\u00e8res soci\u00e9t\u00e9s d’h\u00e9bergement web \u00e0 rem\u00e9dier \u00e0 cette vuln\u00e9rabilit\u00e9. D\u00e8s que l’attaque HTTP\/2 Rapid Reset a \u00e9t\u00e9 signal\u00e9e, nos ing\u00e9nieurs en s\u00e9curit\u00e9 sont entr\u00e9s en action. L’annonce officielle a \u00e9t\u00e9 publi\u00e9e r\u00e9cemment – le 10 octobre 2023, Google, Amazon et CloudFlare annon\u00e7ant simultan\u00e9ment le probl\u00e8me. Le logiciel de serveur web que nous utilisons pour tous les serveurs d’h\u00e9bergement, Nginx, a \u00e9galement publi\u00e9 un article de blog<\/a><\/p>\n\n\n\n

Notre \u00e9quipe d’experts en s\u00e9curit\u00e9 a travaill\u00e9 sans rel\u00e2che pour corriger tous nos serveurs web dans l’heure qui a suivi la divulgation de la vuln\u00e9rabilit\u00e9. Cette r\u00e9action rapide a permis aux sites web de nos clients de rester s\u00e9curis\u00e9s et op\u00e9rationnels, avec un minimum de perturbations. Aujourd’hui, tous les serveurs SiteGround (serveurs d’h\u00e9bergement web et CDN) utilisent le code Nginx corrig\u00e9, ce qui prot\u00e8ge tous les sites web utilisant nos services.<\/p>\n\n\n\n

<\/span>R\u00e9sultat<\/span><\/h2>\n\n\n\n

L’attaque HTTP\/2 Rapid Reset est une menace s\u00e9rieuse, mais gr\u00e2ce \u00e0 notre r\u00e9ponse rapide et \u00e0 notre engagement en mati\u00e8re de s\u00e9curit\u00e9, les clients de SiteGround peuvent dormir sur leurs deux oreilles. Nous assurons vos arri\u00e8res et nous sommes toujours pr\u00eats \u00e0 relever les nouveaux d\u00e9fis qui se pr\u00e9sentent \u00e0 nous. Chez SiteGround, votre s\u00e9curit\u00e9 n’est pas seulement une priorit\u00e9 – c’est une promesse.<\/p>\n","protected":false},"excerpt":{"rendered":"Dans le monde dynamique de la cybers\u00e9curit\u00e9, il n'est pas rare de rencontrer de nouveaux d\u00e9fis. R\u00e9cemment, une nouvelle vuln\u00e9rabilit\u00e9, baptis\u00e9e \"HTTP\/2 Rapid Reset\", a \u00e9t\u00e9 d\u00e9couverte. \u00c9tant donn\u00e9 que le HTTP\/2 est consid\u00e9r\u00e9 comme un protocole relativement nouveau, nous voyons chaque jour des moyens plus modernes et plus intelligents d'effectuer des attaques. 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