{"id":184024,"date":"2026-10-28T23:40:36","date_gmt":"2026-10-28T21:40:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/udalyonnaya-uyazvimost-v-servernyh-uefi-proshivkah-ekspluatiruemaya-cherez-otpravku-icmp-paketa"},"modified":"2026-10-28T23:40:41","modified_gmt":"2026-10-28T21:40:41","slug":"remote-vulnerability-in-server-uefi-firmware-exploitable-by-sending-an-icmp-packet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/remote-vulnerability-in-server-uefi-firmware-exploitable-by-sending-an-icmp-packet","title":{"rendered":"Fjernbar s\u00e5rbarhed i serverens UEFI-firmware, der udnyttes ved at sende ICMP-pakker","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I TianoCore EDK II (EFI Development Kit II), en \u00e5ben referenceimplementering af UEFI, der anvendes p\u00e5 de fleste servermoderkort, er en kritisk s\u00e5rbarhed (CVE-2026-97631) blevet udbedret. S\u00e5rbarheden findes i PXE-driveren og kan udnyttes ved at sende specifikt formaterede ICMP-pakker under netv\u00e6rksboot i IPv4- eller IPv6-netv\u00e6rk. Angrebet kr\u00e6ver ikke godkendelse og giver en angriber mulighed for at udf\u00f8re sin kode med UEFI-firmwareprivilegier, f\u00f8r kontrollen overg\u00e5r til operativsystemet, hvilket kan bruges til at omg\u00e5 UEFI Secure Boot-validationsmekanismen og inds\u00e6tte ondsindede komponenter under opstart.<\/p>\n

Problemet skyldes en buffer-overl\u00f8b i ICMP-beskedbehandleren i UefiPxeBcDxe-driveren, som bruges til PXE-opstart og modtager ICMP-pakker under netv\u00e6rksopstart for at registrere netv\u00e6rksfejl. Overl\u00f8bet opst\u00e5r, fordi de modtagne fejlbepkeder placeres i en fast buffer p\u00e5 504 byte uden at kontrollere den faktiske st\u00f8rrelse af de modtagne data. Hvis der sendes mere end 504 byte i en ICMP-pakke, vil den ikke-placerbare del skrive uden for bufferen og overlappe f\u00f8lgende strukturer. <\/p>\n

Angrebet kan udf\u00f8res fra det globale netv\u00e6rk — det er tilstr\u00e6kkeligt at kende offerets IP-adresse og v\u00e6re i stand til at bestemme tidspunktet for PXE-boot. Ved at vide, hvilken firmware der anvendes serveren<\/a> offret, kan angriberen forberede et exploit med henblik p\u00e5 placeringen af strukturerne i hukommelsen for den specifikke firmware-version og udnytte s\u00e5rbarheden til at udf\u00f8re kode p\u00e5 DXE (Driver Execution Environment) niveau, der k\u00f8rer i ring 0 beskyttelse. <\/p>\n

EDK II-projektet blev \u00e5bnet i 2004 af Intel og anvendes af alle st\u00f8rre firmwareproducenter til serversystemer, datacentre og cloud-udbydere. Blandt andet anvendes det i AMI-, Insyde- og Phoenix-firmwares. S\u00e5rbarhederne findes ogs\u00e5 i firmware baseret p\u00e5 Microsofts Mu-platform, som er en fork af EDK II.<\/p>\n

Problemet blev identificeret af repr\u00e6sentanter fra Anthropic og Google og var planlagt til en koordineret offentlig offentligg\u00f8relse i januar 2027. Men oplysningerne m\u00e5tte offentligg\u00f8res tidligere, da en ingeni\u00f8r fra AMI ved en fejltagelse br\u00f8d embargoen og offentliggjorde en offentlig pull-anmodning med en l\u00f8sning, som gjorde det muligt at forst\u00e5 s\u00e5rbarhedens essens.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 TianoCore EDK II (EFI Development Kit II), \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 UEFI, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0432 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u043d\u0441\u043a\u0438\u0445 \u043f\u043b\u0430\u0442, \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-97631). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0435 PXE \u0438 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 ICMP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0441\u0435\u0442\u0435\u0432\u043e\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0432 \u0441\u0435\u0442\u044f\u0445 IPv4 \u0438\u043b\u0438 IPv6. \u0410\u0442\u0430\u043a\u0430 \u043d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-184024","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\n","aioseo_head_json":{"title":"\ud83e\udd47Fjerns\u00e5rbarhed i servernes UEFI-firmware, udnyttet gennem afsendelse af ICMP-pakker | ProHoster","description":"I TianoCore EDK II (EFI Development Kit II), den \u00e5bne referenceimplementering af UEFI, der anvendes i de fleste serverbundkort, er der blevet rettet en kritisk s\u00e5rbarhed (CVE-2026-97631).","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/remote-vulnerability-in-server-uefi-firmware-exploitable-by-sending-an-icmp-packet","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u0434\u0430\u043b\u0451\u043d\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 UEFI-\u043f\u0440\u043e\u0448\u0438\u0432\u043a\u0430\u0445, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 ICMP-\u043f\u0430\u043a\u0435\u0442\u0430 | ProHoster","og:description":"\u0412 TianoCore EDK II (EFI Development Kit II), \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 UEFI, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0432 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u043d\u0441\u043a\u0438\u0445 \u043f\u043b\u0430\u0442, \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-97631).","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/remote-vulnerability-in-server-uefi-firmware-exploitable-by-sending-an-icmp-packet","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":"2026-10-28T21:40:36+00:00","article:modified_time":"2026-10-28T21:40:41+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/184024","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=184024"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/184024\/revisions"}],"predecessor-version":[{"id":184025,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/184024\/revisions\/184025"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=184024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=184024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=184024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}