Byly odhaleny informace o \u0161est\u00e9 zranitelnosti (1, 2-3, 4, 5), kter\u00e1 umo\u017e\u0148uje nep\u0159ihl\u00e1\u0161en\u00e9mu m\u00edstn\u00edmu u\u017eivateli z\u00edskat pr\u00e1va root p\u0159episov\u00e1n\u00edm dat v str\u00e1nkov\u00e9m cache. Zranitelnost z\u00edskala k\u00f3dov\u00e9 jm\u00e9no PinTheft. Prototyp exploit je k dispozici. CVE identifik\u00e1tor je\u0161t\u011b nebyl p\u0159id\u011blen. Oprava je zat\u00edm dostupn\u00e1 pouze ve form\u011b patch, kter\u00fd byl publikov\u00e1n 5. kv\u011btna a 11. kv\u011btna byl p\u0159ijat do v\u011btve netdev, ale nebyl zahrnut do opravovan\u00fdch vyd\u00e1n\u00ed j\u00e1dra. <\/p>\n
Zranitelnost je p\u0159\u00edtomna v implementaci s\u00ed\u0165ov\u00e9ho protokolu RDS (Reliable Datagram Sockets), ur\u010den\u00e9ho pro vysokorychlostn\u00ed v\u00fdm\u011bnu zpr\u00e1v mezi uzly v klastru, s minim\u00e1ln\u00edmi zpo\u017ed\u011bn\u00edmi a garantovan\u00fdm doru\u010den\u00edm. \u00datok je mo\u017en\u00fd na syst\u00e9mech se zapnutou subsyst\u00e9mem io_uring (io_uring_disabled=0) a j\u00e1drem sestaven\u00fdm s mo\u017enostmi CONFIG_RDS, CONFIG_RDS_TCP a CONFIG_IO_URING. Pro fungov\u00e1n\u00ed exploit mus\u00ed b\u00fdt v syst\u00e9mu k dispozici spustiteln\u00fd soubor s flagem SUID-root. <\/p>\n
Pro automatick\u00e9 na\u010dten\u00ed modulu j\u00e1dra rds_tcp exploity \u017e\u00e1daj\u00ed o odesl\u00e1n\u00ed dat p\u0159es RDS pomoc\u00ed transportu SO_RDS_TRANSPORT=2. Je t\u0159eba poznamenat, \u017ee mezi testovan\u00fdmi distribucemi Linuxu je modul j\u00e1dra rds ve v\u00fdchoz\u00ed konfiguraci k dispozici pouze v Arch Linuxu. K zablokov\u00e1n\u00ed zranitelnosti obejit\u00edm m\u016f\u017eete zablokovat automatick\u00e9 na\u010d\u00edt\u00e1n\u00ed modul\u016f j\u00e1dra rds a rds_tcp: rmmod rds_tcp rds printf 'install rds \/bin\/false\ninstall rds_tcp \/bin\/false\n' > \/etc\/modprobe.d\/pintheft.conf <\/p>\n
Zranitelnost je zp\u016fsobena chybou v implementaci mechanismu zerocopy ve funkci rds_message_zcopy_from_user(), kter\u00e1 prov\u00e1d\u00ed p\u0159\u00edmou zm\u011bnu dat v str\u00e1nkov\u00e9m cache za \u00fa\u010delem vylou\u010den\u00ed zbyte\u010dn\u00e9 bufferizace. V p\u0159\u00edpad\u011b selh\u00e1n\u00ed nebylo pole rm->data.op_nents vy\u010di\u0161t\u011bno, co\u017e vedlo k dvoj\u00edmu uvoln\u011bn\u00ed bufferu (double-free). Vznik nekorektn\u00ed hodnoty v po\u010d\u00edtadle odkaz\u016f bylo mo\u017en\u00e9 zneu\u017e\u00edt k p\u0159eps\u00e1n\u00ed dat v str\u00e1nkov\u00e9m cache d\u00edky manipulaci s ukazatelem na fixn\u00ed buffer io_uring. <\/p>\n
Co se t\u00fd\u010de ostatn\u00edch aspekt\u016f exploita\u010dn\u00edho mechanismu, ten je typick\u00fd pro v\u0161echny zranitelnosti t\u00e9to t\u0159\u00eddy \u2014 \u00fato\u010dn\u00edk dos\u00e1hne ulo\u017een\u00ed souboru programu s p\u0159\u00edznakem suid root v str\u00e1nkov\u00e9m cache, po \u010dem\u017e do ELF hlavi\u010dky vlo\u017e\u00ed k\u00f3d k spu\u0161t\u011bn\u00ed \/usr\/bin\/sh. Po t\u00e9to manipulaci spou\u0161t\u011bn\u00ed programu vede k na\u010dten\u00ed do pam\u011bti ne origin\u00e1ln\u00edho spustiteln\u00e9ho souboru z \u00falo\u017ei\u0161t\u011b, ale zm\u011bn\u011bn\u00e9 kopie ze str\u00e1nkov\u00e9ho cache. Na rozd\u00edl od p\u0159edchoz\u00edch exploit\u016f, nov\u00e1 varianta je adaptov\u00e1na pouze pro \u00fatok na n\u00e1stroj \u201esu\u201c, ale m\u016f\u017ee b\u00fdt tak\u00e9 pou\u017eita v p\u0159\u00edpad\u011b, \u017ee v syst\u00e9mu existuj\u00ed takov\u00e9 suid programy, jako jsou mount, passwd, chsh, newgrp, umount a pkexec. \u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f PinTheft. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 5 \u043c\u0430\u044f \u0438 11 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442\u0432 \u0432\u0435\u0442\u043a\u0443 netdev, \u043d\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0451\u043d \u0432 […]<\/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-172753","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\udd47PinTheft \u2014 \u0161est\u00e1 zranitelnost t\u0159\u00eddy Copy Fail, poskytuj\u00edc\u00ed pr\u00e1va root v Linuxu | ProHoster","description":"Byly odhaleny informace o \u0161est\u00e9 zranitelnosti (1, 2-3, 4, 5), kter\u00e1 umo\u017e\u0148uje nep\u0159 privilegovan\u00e9mu m\u00edstn\u00edmu u\u017eivateli z\u00edskat pr\u00e1va root p\u0159eps\u00e1n\u00edm dat ve str\u00e1nkov\u00e9m 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ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","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":"2026-05-19T16:24:36+00:00","article:modified_time":"2026-05-19T16:24:36+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\/172753","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=172753"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/172753\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=172753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=172753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=172753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"