{"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\/da\/blog\/news\/skanirovnie-portov-privelo-k-blokirovke-podseti-provajderom-iz-za-popadaniya-v-spisok-uceprotect","title":{"rendered":"Portscanningen f\u00f8rte til, at udbyderen blokerede subnettet, fordi det kom p\u00e5 UCEPROTECT-listen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Vincent Canfield, administrator for mailtjenesten og hosting-reselleren cock.li, opdagede, at hele hans IP-netv\u00e6rk automatisk blev tilf\u00f8jet til DNSBL UCEPROTECT-listen p\u00e5 grund af portscanning fra nabovirtuelle maskiner. Vincents subnet kom p\u00e5 liste niveau 3, hvor blokeringen foretages ud fra autonome systemnumre og d\u00e6kker hele subnet, som gentagne gange og for forskellige adresser har udl\u00f8st spamdetekteringssystemer. Som et resultat afbr\u00f8d udbyderen M247 annonceringen af et af hans netv\u00e6rk i BGP, hvilket egentlig stoppede servicen. <\/p>\n

Problemet er, at det er falske servere<\/a> UCEPROTECT, som udgiver sig for at v\u00e6re \u00e5bne relais og registrerer fors\u00f8g p\u00e5 at sende post igennem sig, tilf\u00f8jer automatisk adresser til bloklisten baseret p\u00e5 enhver netv\u00e6rksaktivitet uden at tjekke for etablering af netv\u00e6rksforbindelse. En lignende metode til at blive sat p\u00e5 bloklisten anvendes ogs\u00e5 af Spamhaus-projektet. <\/p>\n

Det er tilstr\u00e6kkeligt at sende et enkelt TCP SYN-pakke for at havne p\u00e5 bloklisten, hvilket kan udnyttes af ondsindede akt\u00f8rer. Is\u00e6r fordi tovejskommunikation af TCP-forbindelsen ikke kr\u00e6ves, kan en pakke sendes med en falsk IP-adresser<\/a> og initiere blokeringen af enhver v\u00e6rt. Ved at simulere aktivitet fra flere adresser kan man opn\u00e5, at blokeringen eskalerer til niveau 2 og niveau 3, som blokerer baseret p\u00e5 subnet og nummer af autonome systemer. <\/p>\n

Niveau 3-listen blev oprindeligt oprettet for at bek\u00e6mpe udbydere, der tilskynder til skadelig aktivitet hos kunderne og ikke reagerer p\u00e5 klager (for eksempel hosting-tjenester, der er specifikt designet til at huse ulovligt indhold eller servicere spammere). For flere dage siden \u00e6ndrede UCEPROTECT reglerne for at komme p\u00e5 niveau 2 og niveau 3 listerne, hvilket f\u00f8rte til en mere aggressiv filtrering og en stigning i st\u00f8rrelsen af listerne. For eksempel voksede antallet af poster p\u00e5 niveau 3-listen fra 28 til 843 autonome systemer. <\/p>\n

For countering UCEPROTECT, the idea was suggested to use spoofed addresses with IPs from the UCEPROTECT sponsors' range during scanning. As a result, UCEPROTECT added the addresses of its sponsors and many other innocent parties to its databases, which caused email delivery issues. This included a CDN network from the company Sucuri being added to the blacklist.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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. 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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99147","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Port scanning led to the blocking of the subnet by the provider due to being listed in UCEPROTECT | ProHoster","description":"Vincent Canfield, an administrator of the mail service and hosting reseller cock.li, found that his entire IP network was automatically added to the DNSBL UCEPROTECT list due to port scanning from neighboring 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