Bola odhalen\u00e1 \u0161iest\u00e1 zranite\u013enos\u0165 (1, 2-3, 4, 5), ktor\u00e1 umo\u017e\u0148uje nepriviligovan\u00e9mu lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va root prep\u00edsan\u00edm \u00fadajov v str\u00e1nkovom cache. Zranite\u013enos\u0165 dostala k\u00f3dov\u00e9 meno PinTheft. Je k dispoz\u00edcii prototyp exploitov. CVE identifik\u00e1tor e\u0161te nebol priraden\u00fd. Oprava je zatia\u013e dostupn\u00e1 iba vo forme opravn\u00fdch s\u00faborov, ktor\u00e1 bola zverejnen\u00e1 5. m\u00e1ja a 11. m\u00e1ja bola prijat\u00e1 do vetvy netdev, ale nebola zahrnut\u00e1 do opravn\u00fdch vydan\u00ed jadra. <\/p>\n
Zranite\u013enos\u0165 sa nach\u00e1dza v implement\u00e1cii sie\u0165ov\u00e9ho protokolu RDS (Reliable Datagram Sockets), ktor\u00fd je ur\u010den\u00fd na vysokor\u00fdchlostn\u00fa v\u00fdmenu spr\u00e1v medzi uzlami v klastri s minim\u00e1lnym oneskoren\u00edm a zaru\u010denou dod\u00e1vkou. \u00datok je mo\u017en\u00fd na syst\u00e9moch so zapnutou subsyst\u00e9mom io_uring (io_uring_disabled=0) a jadrom zlo\u017een\u00fdm s vo\u013ebami CONFIG_RDS, CONFIG_RDS_TCP a CONFIG_IO_URING. Na fungovanie exploitov mus\u00ed by\u0165 v syst\u00e9me dostupn\u00fd na \u010d\u00edtanie vykonate\u013en\u00fd s\u00fabor s vlajkou SUID-root. <\/p>\n
Na automatick\u00e9 na\u010d\u00edtanie modulu jadra rds_tcp exploit po\u017eaduje odoslanie \u00fadajov cez RDS s pou\u017eit\u00edm dopravy SO_RDS_TRANSPORT=2. Je pozoruhodn\u00e9, \u017ee medzi testovan\u00fdmi distrib\u00faciami Linuxu je modul jadra rds vo svojej predvolenej konfigur\u00e1cii dostupn\u00fd iba v Arch Linux. Na blokovanie zranite\u013enosti obch\u00e1dzaj\u00facim sp\u00f4sobom je mo\u017en\u00e9 zablokova\u0165 automatick\u00e9 na\u010d\u00edtanie modulov jadra 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
Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 chybou v implement\u00e1cii mechanizmu zerocopy vo funkcii rds_message_zcopy_from_user(), ktor\u00e1 priamo men\u00ed \u00fadaje v str\u00e1nkovom cache na vyl\u00fa\u010denie nadbyto\u010dn\u00e9ho bufferingu. V pr\u00edpade zlyhania nebolo vy\u010disten\u00e9 pole rm->data.op_nents, \u010do viedlo k dvojit\u00e9mu oslobodeniu (double-free) bufferu. Vznik neplatnej hodnoty v po\u010d\u00edtadle odkazov bolo mo\u017en\u00e9 zneu\u017ei\u0165 na prep\u00edsanie \u00fadajov v str\u00e1nkovom cache, v\u010faka manipul\u00e1cii s ukazovate\u013eom na fixovan\u00fd buffer io_uring. <\/p>\n
Inak je mechanizmus exploit\u00e1cie typick\u00fd pre v\u0161etky zranite\u013enosti tejto triedy \u2014 \u00fato\u010dn\u00edk dosahuje usadenie s\u00faboru programu s flagom suid root v str\u00e1nkovom cache, po \u010dom vklad\u00e1 do ELF-hlavice k\u00f3d na spustenie \/usr\/bin\/sh. Po tejto manipul\u00e1cii spustenie programu vedie k na\u010d\u00edtaniu do pam\u00e4te nie p\u00f4vodn\u00e9ho spustite\u013en\u00e9ho s\u00faboru z \u00falo\u017eiska, ale zmenenej k\u00f3pie zo str\u00e1nkov\u00e9ho cache. Na rozdiel od predch\u00e1dzaj\u00facich exploitov je nov\u00e1 verzia prisp\u00f4soben\u00e1 len na \u00fatok na utilitu \u201esu\u201c, ale m\u00f4\u017ee sa tie\u017e pou\u017ei\u0165 pri pr\u00edtomnosti v syst\u00e9me tak\u00fdch suid-programov, ako s\u00fa 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 - \u0161iesta zranite\u013enos\u0165 triedy Copy Fail, poskytuj\u00faca pr\u00e1va root v Linuxe | ProHoster","description":"Bola zverejnen\u00e1 inform\u00e1cia o \u0161iestej zranite\u013enosti (1, 2-3, 4, 5), ktor\u00e1 umo\u017e\u0148uje nepriviligovan\u00e9mu lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va root prep\u00edsan\u00edm \u00fadajov v str\u00e1nkovom cache.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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\udd47PinTheft \u2014 \u0448\u0435\u0441\u0442\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043b\u0430\u0441\u0441\u0430 Copy Fail, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0430\u0432\u0430 root \u0432 Linux | 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\/sk\/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\/sk\/wp-json\/wp\/v2\/posts\/172753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/comments?post=172753"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/172753\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/media?parent=172753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/categories?post=172753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/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":"