{"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\/et\/blog\/news\/uyazvimost-v-cups-okazalas-prigodna-dlya-usileniya-trafika-pri-ddos-atakah","title":{"rendered":"CUPS-is avastatud haavatavus, mis on kasutatav DDoS-r\u00fcnnakute liikluse suurendamiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Akamai's content delivery network security team has identified an additional attack vector on the cups-browsed process, apart from its use as one of the links in an exploit that leads to code execution on the system. By sending requests to the cups-browsed process, which accepts connections unrestricted on port 631, it is possible to send data to another host, with a size that can exceed the original request by up to 600 times. In comparison, the amplification factor for memcached can reach between 10,000 to 50,000 times, NTP - 556 times, DNS - 28 to 54, RIPv2 - 21, SNMPv2 - 6. <\/p>\n

This feature allows systems with cups-browsed to be used as traffic amplifiers during DDoS attacks. The amplification attack method is based on the fact that requests from computers participating in DDoS attacks are routed not directly to the victim's system, but through an intermediate traffic amplifier. During network scanning, more than 198,000 vulnerable systems with CUPS were identified, of which 34% (58,000 systems) were found to be suitable for traffic amplification in a DDoS attack. <\/p>\n

Unlike traffic amplification methods that require sending UDP packets with a spoofed return address of the victim, using cups-browsed allows this to be done without spoofing. The cups-browsed service has a native ability to load a PPD file from an arbitrary serverilt<\/a> in response to an unauthorized external request, during which the client transmits a URL, and cups-browsed attempts to load the PPD file from the specified server. <\/p>\n

When sending a request to upload a PPD file to cups-browsed, it is possible to attach an additional filler to the \"IPP URI\" value that can reach up to 989 bytes. In this case, the value of \"IPP URI\" is duplicated in the initiated cups-browsed request - once in the HTTP header and again within the body of the POST request, while requests are cyclically repeated after unsuccessful upload attempts and failures. serverilt<\/a> a 404 error code. <\/p>\n

62%-l (35,900) kontrollitud s\u00fcsteemist saatis cups-browsed v\u00e4hemalt 10 TCP\/IPP\/HTTP p\u00e4ringut r\u00fcnnatavale s\u00fcsteemile \u00fche algse UDP p\u00e4ringu vastusena. Keskmiselt 58,000 haavatava s\u00fcsteemi puhul oli uute p\u00e4ringute arv 45. Optimaalses stsenaariumis, kui saadetakse \u00fcks 30-baidine algne p\u00e4ring 45 korduvkatsega, saadataks sihts\u00fcsteemile 18,000 baidi andmeid, mis t\u00e4hendab, et liiklus tugevneb 600 korda. Halvimal juhul on tugevus 108 korda. <\/p>\n

Lisaks v\u00f5ib m\u00e4rkida, et Cloudflare'i poolt peegeldati rekordiline DDoS-r\u00fcnnak, mille k\u00e4igus suunati ohvrisse 3.8 terabitit sekundis (2.14 miljardit paketti sekundis). R\u00fcnnak oli korraldatud suure hulga kompromiteeritud koduteede ruuterite Asus ja Mikrotik, samuti DVR-seadmete ja veebiserverite abil, mille n\u00f5rkusest kasutas \u00e4ra suhteliselt uusi haavatavusi.
\n
Allikas: 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\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\udd47CUPS-i haavatavus osutus DDoS-r\u00fcnnakute ajal liikluse tugevdamiseks sobivaks | ProHoster","description":"Akamai sisu edastusv\u00f5rgu turvagrupiga on tuvastatud t\u00e4iendav r\u00fcnnaku vektor cups-browsed protsessi jaoks, peale selle kasutamist \u00fche l\u00fclina eksploitis, mis 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