{"id":170807,"date":"2026-05-16T06:24:35","date_gmt":"2026-05-16T04:24:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/qemutiny-uyazvimosti-v-qemu-pozvolyayushhie-poluchit-dostup-k-host-okruzheniyu-iz-gostevoj-sistemy"},"modified":"2026-05-16T06:24:35","modified_gmt":"2026-05-16T04:24:35","slug":"qemutiny-uyazvimosti-v-qemu-pozvolyayushhie-poluchit-dostup-k-host-okruzheniyu-iz-gostevoj-sistemy","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/qemutiny-uyazvimosti-v-qemu-pozvolyayushhie-poluchit-dostup-k-host-okruzheniyu-iz-gostevoj-sistemy","title":{"rendered":"QEMUtiny \u2014 zranitelnosti v QEMU, kter\u00e9 umo\u017e\u0148uj\u00ed p\u0159\u00edstup k hostitelsk\u00e9mu prost\u0159ed\u00ed z virtu\u00e1ln\u00edho syst\u00e9mu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci, kte\u0159\u00ed ned\u00e1vno identifikovali zranitelnost Fragnesia v j\u00e1dru Linux, zve\u0159ejnili informace o zranitelnostech v QEMU, kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edskat root p\u0159\u00edstup k hostitelsk\u00e9mu prost\u0159ed\u00ed z virtu\u00e1ln\u00edho syst\u00e9mu. Probl\u00e9m byl pojmenov\u00e1n QEMUtiny, av\u0161ak zat\u00edm nebyl p\u0159i\u0159azen identifik\u00e1tor CVE. Bylo p\u0159ipraveno exploity, kter\u00e9 vyu\u017e\u00edvaj\u00ed dv\u011b zranitelnosti v k\u00f3du emulace za\u0159\u00edzen\u00ed CXL (Compute Express Link). <\/p>\n

Ob\u011b zranitelnosti se nach\u00e1zej\u00ed v k\u00f3du cxl-mailbox-utils.c. Prvn\u00ed zranitelnost se projevuje od verze QEMU 7.1.0 a vede k \u010dten\u00ed pam\u011bti z oblasti mimo p\u0159id\u011blen\u00fd buffer, proto\u017ee funkce cmd_logs_get_log() chybn\u011b vyhodnocuje po\u017eadovan\u00fd posun CEL-logu jako index v poli, zat\u00edmco je ur\u010den v bajtech. Druh\u00e1 zranitelnost se projevuje od QEMU 11.0.0 a vede k p\u0159ete\u010den\u00ed bufferu ve funkci cmd_features_set_feature() kv\u016fli zpracov\u00e1n\u00ed posunu ke struktur\u00e1m p\u0159i z\u00e1pisu atribut\u016f bez kontroly, \u017ee vypo\u010d\u00edtan\u00e1 hodnota \u201eoffset + bytes_to_copy\u201c se vejde do velikosti vybran\u00e9 struktury. <\/p>\n

Ve skute\u010dnosti je \u00fatok mo\u017en\u00fd pouze na posledn\u00ed verzi QEMU 11.0.0. O oprav\u011b zat\u00edm nebyly zpr\u00e1vy, pouze bylo uvedeno, \u017ee p\u0159ed zve\u0159ejn\u011bn\u00edm zranitelnosti byla informace p\u0159ed\u00e1na v\u00fdvoj\u00e1\u0159\u016fm QEMU, kte\u0159\u00ed odpov\u011bd\u011bli, \u017ee podpora za\u0159\u00edzen\u00ed CXL v QEMU nen\u00ed ur\u010dena pro pou\u017eit\u00ed p\u0159i virtualizaci. <\/p>\n

Exploity byly testov\u00e1ny s k\u00f3dovou z\u00e1kladnou QEMU z 11. kv\u011btna s posledn\u00edm commitem 5e61afe. Fungov\u00e1n\u00ed exploitu z\u00e1vis\u00ed na rozlo\u017een\u00ed struktur v pam\u011bti ka\u017ed\u00e9 konkr\u00e9tn\u00ed verze QEMU a syst\u00e9mov\u00e9 libc, ale podle n\u00e1zoru v\u00fdzkumn\u00edk\u016f lze vytvo\u0159it univerz\u00e1ln\u00ed exploit, kter\u00fd funguje s r\u016fzn\u00fdmi verzemi QEMU, pokud se k jeho skenov\u00e1n\u00ed vyu\u017eije zranitelnost vedouc\u00ed k \u010dten\u00ed z oblasti mimo buffer.
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0430 \u0434\u043d\u044f\u0445 \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Fragnesia \u0432 \u044f\u0434\u0440\u0435 Linux, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 QEMU, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044e. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f QEMUtiny, \u043d\u043e CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043f\u043e\u043a\u0430 \u043d\u0435 \u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d. \u041f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043a\u043e\u0434\u0435 \u044d\u043c\u0443\u043b\u044f\u0446\u0438\u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 CXL (Compute Express Link). \u041e\u0431\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0442 \u0432 \u043a\u043e\u0434\u0435 cxl-mailbox-utils.c. […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170807","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\udd47QEMUtiny \u2014 zranitelnosti v QEMU, kter\u00e9 umo\u017e\u0148uj\u00ed p\u0159\u00edstup k hostitelsk\u00e9mu prost\u0159ed\u00ed z virtu\u00e1ln\u00edho syst\u00e9mu | ProHoster","description":"V\u00fdzkumn\u00edci, kte\u0159\u00ed ned\u00e1vno identifikovali zranitelnost Fragnesia v j\u00e1dru Linux, zve\u0159ejnili informace o zranitelnostech v QEMU, kter\u00e9 umo\u017e\u0148uj\u00ed z\u00edskat root p\u0159\u00edstup k hostitelsk\u00e9mu prost\u0159ed\u00ed z virtu\u00e1ln\u00edho syst\u00e9mu.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/qemutiny-uyazvimosti-v-qemu-pozvolyayushhie-poluchit-dostup-k-host-okruzheniyu-iz-gostevoj-sistemy","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\udd47QEMUtiny \u2014 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 QEMU, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044e \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0430 \u0434\u043d\u044f\u0445 \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Fragnesia \u0432 \u044f\u0434\u0440\u0435 Linux, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 QEMU, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0438\u0437 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0445\u043e\u0441\u0442-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044e.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/qemutiny-uyazvimosti-v-qemu-pozvolyayushhie-poluchit-dostup-k-host-okruzheniyu-iz-gostevoj-sistemy","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":"2026-05-16T04:24:35+00:00","article:modified_time":"2026-05-16T04:24:35+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/170807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=170807"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/170807\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=170807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=170807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=170807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}