{"id":120072,"date":"2024-10-07T13:09:25","date_gmt":"2024-10-07T11:09:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah"},"modified":"2024-10-07T13:09:25","modified_gmt":"2024-10-07T11:09:25","slug":"uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","title":{"rendered":"S\u00e5rbarhed i CUPS viste sig at v\u00e6re nyttig til at forst\u00e6rke trafik under DDoS-angreb","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Gruppen, der er ansvarlig for sikkerheden i Akamai's indholdsleveringsnetv\u00e6rk, har identificeret en ekstra angrebsvektor mod processen cups-browsed, udover dens anvendelse som et led i et exploit, der f\u00f8rer til kodeeksekvering i systemet. Ved at sende foresp\u00f8rgsler til processen cups-browsed, som uden begr\u00e6nsninger accepterer forbindelser p\u00e5 port 631, kan man opn\u00e5 overf\u00f8rsel af data til en anden v\u00e6rt, hvis st\u00f8rrelse kan overstige den oprindelige foresp\u00f8rgsel med op til 600 gange. Til sammenligning kan forst\u00e6rkningsforholdet for memcached n\u00e5 op p\u00e5 10-50 tusinde gange, NTP - 556 gange, DNS - 28-54, RIPv2 - 21, SNMPv2 - 6. <\/p>\n

En s\u00e5dan egenskab muligg\u00f8r brugen af systemer med cups-browsed som trafikforst\u00e6rkere ved udf\u00f8relse af DDoS-angreb. Angrebsmetoden ved brug af trafikforst\u00e6rkere bygger p\u00e5 det faktum, at anmodninger fra computere, der deltager i DDoS-angreb, ikke sendes direkte til offerets system, men gennem en mellemleds trafikforst\u00e6rker. Under scanningen af netv\u00e6rket blev der identificeret over 198.000 s\u00e5rbare systemer med CUPS, hvoraf 34% (58.000 systemer) viste sig at v\u00e6re egnede til at forst\u00e6rke trafik i DDoS-angreb. <\/p>\n

I mods\u00e6tning til trafikforst\u00e6rkningsmetoder, der kr\u00e6ver sending af UDP-pakker med et falsk returadresse fra offeret, g\u00f8r brugen af cups-browsed det muligt at undg\u00e5 spoofing. Tjenesten cups-browsed har en indbygget mulighed for at downloade PPD-filer fra et vilk\u00e5rligt server<\/a> som svar p\u00e5 en uautoriseret ekstern anmodning, hvor klienten sender en URL, og cups-browsed fors\u00f8ger at downloade PPD-filen fra den angivne server. <\/p>\n

Ved at sende en foresp\u00f8rgsel om at hente en PPD-fil i cups-browsed kan man opn\u00e5, at et till\u00e6g til v\u00e6rdien \u00abIPP URI\u00bb kan n\u00e5 op p\u00e5 989 bytes. Herudover dubleres v\u00e6rdien \u00abIPP URI\u00bb i den initierede cups-browsed anmodning - \u00e9n gang i HTTP-headeren, og en anden gang inde i kroppen af POST-anmodningen, og anmodningerne gentages cyklisk efter mislykkede fors\u00f8g p\u00e5 at hente og returnere. serveren<\/a> 404-fejlkoden. <\/p>\n

P\u00e5 62% (35900) af de unders\u00f8gte systemer sendte cups-browsed mindst 10 TCP\/IP-HTTP-anmodninger til det angrebne system som svar p\u00e5 en enkelt UDP-anmodning. I gennemsnit for 58000 s\u00e5rbare systemer var antallet af gentagne anmodninger 45. I det optimale scenarie vil en enkelt 30-byte UDP-anmodning med 45 gentagne fors\u00f8g resultere i, at der sendes 18000 byte data til det m\u00e5lrettede system, hvilket giver en trafikforst\u00e6rkning p\u00e5 600 gange. I det v\u00e6rste scenarie er forst\u00e6rkningen 108 gange. <\/p>\n

Desuden kan der n\u00e6vnes, at Cloudflare har afv\u00e6rget et rekordstort DDoS-angreb, hvor der blev rettet et trafikflow p\u00e5 3,8 terabit per sekund (2,14 milliarder pakker per sekund) mod offersystemet. Det er bem\u00e6rket, at angrebet blev organiseret ved hj\u00e6lp af et stort antal kompromitterede hjemmeroutrar fra Asus og Mikrotik samt DVR-enheder og webservere, der blev hacket blandt andet ved hj\u00e6lp af relativt nye s\u00e5rbarheder.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0413\u0440\u0443\u043f\u043f\u0430, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0430\u044f \u0437\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 Akamai, \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u0435\u043a\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 cups-browsed, \u043f\u043e\u043c\u0438\u043c\u043e \u0435\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u0437\u0432\u0435\u043d\u044c\u0435\u0432 \u0432 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0435, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u043c \u043a \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0427\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043a \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 cups-browsed, \u0431\u0435\u0437 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u044e\u0449\u0435\u043c\u0443 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043d\u0430 631 \u043f\u043e\u0440\u0442\u0443, \u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 \u0445\u043e\u0441\u0442, \u0440\u0430\u0437\u043c\u0435\u0440 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u0442\u044c […]<\/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-120072","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\udd47S\u00e5rbarhed i CUPS viste sig at v\u00e6re egnet til trafikforst\u00e6rkning ved DDoS-angreb | ProHoster","description":"Gruppen, der er ansvarlig for sikkerheden i indholdsleveringsnetv\u00e6rket Akamai, har identificeret en yderligere angrebsvektor p\u00e5 cups-browsed-processen, ud over dens brug som et af ledene i et exploit, der f\u00f8rer 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ProHoster","og:description":"\u0413\u0440\u0443\u043f\u043f\u0430, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0430\u044f \u0437\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0441\u0435\u0442\u0438 \u0434\u043e\u0441\u0442\u0430\u0432\u043a\u0438 \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0430 Akamai, \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u0435\u043a\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 cups-browsed, \u043f\u043e\u043c\u0438\u043c\u043e \u0435\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u0437\u0432\u0435\u043d\u044c\u0435\u0432 \u0432 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0435, 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\u043a.","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2024-10-07T11:09:25+00:00","article:modified_time":"2024-10-07T11:09:25+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"120072","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-02-22 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