{"id":99147,"date":"2021-02-16T16:22:36","date_gmt":"2021-02-16T14:22:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/skanirovnie-portov-privelo-k-blokirovke-podseti-provajderom-iz-za-popadaniya-v-spisok-uceprotect"},"modified":"2021-02-16T16:22:36","modified_gmt":"2021-02-16T14:22:36","slug":"skanirovnie-portov-privelo-k-blokirovke-podseti-provajderom-iz-za-popadaniya-v-spisok-uceprotect","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/skanirovnie-portov-privelo-k-blokirovke-podseti-provajderom-iz-za-popadaniya-v-spisok-uceprotect","title":{"rendered":"La num\u00e9risation des ports a entra\u00een\u00e9 le blocage de la sous-r\u00e9seau par le fournisseur en raison de son inscription sur la liste UCEPROTECT.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Vincent Canfield, administrateur du service de messagerie et de l'h\u00e9bergement de revendeurs cock.li, a d\u00e9couvert que l'ensemble de son r\u00e9seau IP avait \u00e9t\u00e9 automatiquement inscrit sur la liste DNSBL UCEPROTECT pour avoir effectu\u00e9 des scans de ports \u00e0 partir de machines virtuelles voisines. Le sous-r\u00e9seau de Vincent a \u00e9t\u00e9 plac\u00e9 sur la liste Level 3, o\u00f9 le blocage est effectu\u00e9 sur la base des num\u00e9ros de syst\u00e8mes autonomes et couvre des sous-r\u00e9seaux entiers \u00e0 partir desquels des d\u00e9tecteurs de spam ont \u00e9t\u00e9 d\u00e9clench\u00e9s \u00e0 plusieurs reprises pour diff\u00e9rentes adresses. En cons\u00e9quence, le fournisseur M247 a d\u00e9sactiv\u00e9 l'annonce de l'un de ses r\u00e9seaux dans le BGP, suspendant ainsi effectivement le service.       <\/p>\n<p>Le probl\u00e8me r\u00e9side dans le fait que les <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/server\/\"   title=\"serveurs\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1914\">serveurs<\/a>   UCEPROTECT, qui pr\u00e9tendent \u00eatre des relais ouverts et enregistrent les tentatives d'envoi de mails \u00e0 travers eux, incluent automatiquement les adresses sur la liste de blocage en fonction de toute activit\u00e9 r\u00e9seau, sans v\u00e9rification de l'\u00e9tablissement de la connexion r\u00e9seau. Une m\u00e9thode similaire de placement sur liste de blocage est \u00e9galement appliqu\u00e9e par le projet Spamhaus.     <\/p>\n<p>Pour \u00eatre inscrit sur la liste de blocage, il suffit d'envoyer un seul paquet TCP SYN, ce qui peut \u00eatre exploit\u00e9 par des attaquants. En particulier, comme aucune confirmation bilat\u00e9rale de la connexion TCP n'est requise, il est possible d'envoyer un paquet en utilisant le spoofing avec une adresse factice <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/lir\/ipv4\/\"   title=\"adresses IP\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"678\">adresses IP<\/a> et d'initier l'inscription sur la liste de blocage de n'importe quel h\u00f4te. En simulant de l'activit\u00e9 \u00e0 partir de plusieurs adresses, il est possible d'escalader le blocage jusqu'aux niveaux Level 2 et Level 3, qui effectuent le blocage par sous-r\u00e9seaux et num\u00e9ros de syst\u00e8mes autonomes.       <\/p>\n<p>La liste Level 3 a \u00e9t\u00e9 cr\u00e9\u00e9e \u00e0 l'origine pour lutter contre les fournisseurs qui encouragent l'activit\u00e9 malveillante des clients et ne r\u00e9agissent pas aux plaintes (par exemple, des h\u00e9bergements cr\u00e9\u00e9s sp\u00e9cifiquement pour h\u00e9berger du contenu ill\u00e9gal ou servir des spammeurs). Il y a quelques jours, UCEPROTECT a chang\u00e9 les r\u00e8gles d'inscription sur les listes Level 2 et Level 3, ce qui a conduit \u00e0 une filtration plus agressive et \u00e0 une augmentation de la taille des listes. Par exemple, le nombre d'enregistrements dans la liste Level 3 est pass\u00e9 de 28 \u00e0 843 syst\u00e8mes autonomes.     <\/p>\n<p>Pour contrer UCEPROTECT, l'id\u00e9e d'utiliser du spoofing d'adresses IP provenant de la plage des sponsors UCEPROTECT lors des scans a \u00e9t\u00e9 \u00e9voqu\u00e9e. En cons\u00e9quence, UCEPROTECT a inclus les adresses de ses sponsors et de nombreuses autres innocentes dans ses bases, cr\u00e9ant des probl\u00e8mes de livraison des emails. Notamment, le r\u00e9seau CDN de la soci\u00e9t\u00e9 Sucuri a \u00e9t\u00e9 inscrit sur la liste de blocage.<br \/>\n<br \/>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54579\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0438\u043d\u0441\u0435\u043d\u0442 \u041a\u044d\u043d\u0444\u0438\u043b\u0434 (Vincent Canfield), \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0438\u0441\u0430 \u0438 \u0445\u043e\u0441\u0442\u0438\u043d\u0433\u0430-\u0440\u0435\u0441\u0435\u043b\u043b\u0435\u0440\u0430 cock.li, \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b, \u0447\u0442\u043e \u0432\u0441\u044e \u0435\u0433\u043e IP-\u0441\u0435\u0442\u044c \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u043d\u0435\u0441\u043b\u0438 \u0432 \u0441\u043f\u0438\u0441\u043e\u043a DNSBL UCEPROTECT \u0437\u0430 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u043e\u0440\u0442\u043e\u0432 \u0441 \u0441\u043e\u0441\u0435\u0434\u043d\u0438\u0445 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d. \u041f\u043e\u0434\u0441\u0435\u0442\u044c \u0412\u0438\u043d\u0441\u0435\u043d\u0442\u0430 \u043f\u043e\u043f\u0430\u043b\u0430 \u0432 \u0441\u043f\u0438\u0441\u043e\u043a Level 3, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e \u043d\u043e\u043c\u0435\u0440\u0430\u043c \u0430\u0432\u0442\u043e\u043d\u043e\u043c\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u0438 \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u0435\u0442 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