{"id":120749,"date":"2024-11-28T21:45:59","date_gmt":"2024-11-28T19:45:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-tuned-pozvolyayushhaya-vypolnit-kod-s-pravami-root"},"modified":"2024-11-28T21:45:59","modified_gmt":"2024-11-28T19:45:59","slug":"uyazvimost-v-tuned-pozvolyayushhaya-vypolnit-kod-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/uyazvimost-v-tuned-pozvolyayushhaya-vypolnit-kod-s-pravami-root","title":{"rendered":"Zranite\u013enos\u0165 v tuned, ktor\u00e1 umo\u017e\u0148uje vykon\u00e1va\u0165 k\u00f3d s pr\u00e1vami root.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V pozad\u00ed, ktor\u00e9 vyv\u00edja spolo\u010dnos\u0165 Red Hat, sa v procese tuned, ktor\u00fd vykon\u00e1va automatick\u00fa optimaliz\u00e1ciu nastaven\u00ed hardv\u00e9ru a jadra v z\u00e1vislosti od aktu\u00e1lneho za\u0165a\u017eenia, objavila zranite\u013enos\u0165 (CVE-2024-52336), ktor\u00e1 umo\u017e\u0148uje lok\u00e1lnemu nef\u00edprivilegovan\u00e9mu pou\u017e\u00edvate\u013eovi vykon\u00e1va\u0165 ak\u00e9ko\u013evek pr\u00edkazy s pr\u00e1vami root. <\/p>\n

Probl\u00e9m spo\u010d\u00edva v implement\u00e1cii DBus met\u00f3dy «com.redhat.tuned.instance_create», ktor\u00e1 sa pou\u017e\u00edva na vytv\u00e1ranie exempl\u00e1rov pluginov, do ktorej je mo\u017en\u00e9 odovzda\u0165 parametre «script_pre» a «script_post» na ur\u010denie skriptov, ktor\u00e9 sa vykon\u00e1vaj\u00fa pred alebo po vytvoren\u00ed exempl\u00e1ra pluginu. Probl\u00e9m je v tom, \u017ee nastavenia Polkit umo\u017e\u0148uj\u00fa ak\u00e9muko\u013evek prihl\u00e1sen\u00e9mu miestnemu pou\u017e\u00edvate\u013eovi bez autentifik\u00e1cie odosla\u0165 DBus po\u017eiadavku na t\u00fato met\u00f3du, zatia\u013e \u010do samotn\u00fd proces tuned be\u017e\u00ed s opr\u00e1vneniami root a sp\u00fa\u0161\u0165a skripty uveden\u00e9 v parametroch «script_pre» a «script_post» tie\u017e s opr\u00e1vneniami root. Napr\u00edklad, aby pou\u017e\u00edvate\u013e spustil skript \/path\/to\/myscript.sh s opr\u00e1vneniami root, sta\u010d\u00ed vykona\u0165 pr\u00edkaz: gdbus call -y -d com.redhat.tuned -o \/Tuned \\ -m com.redhat.tuned.control.instance_create cpu myinstance \\ ‘{«script_pre»: «\/path\/to\/myscript.sh», «devices»: «*»}’ <\/p>\n

V DBus met\u00f3de «com.redhat.tuned.instance_create» sa tie\u017e nach\u00e1dza menej nebezpe\u010dn\u00e1 zranite\u013enos\u0165 (CVE-2024-52337), sp\u00f4soben\u00e1 absenciou \u010distenia hodnoty s menom exempl\u00e1ra pluginu pri jeho v\u00fdstupe do logu. \u00dato\u010dn\u00edk m\u00f4\u017ee prida\u0165 meno, ktor\u00e9 obsahuje znak nov\u00e9ho riadku a escape znaky pre emul\u00e1tor termin\u00e1lu, ktor\u00e9 m\u00f4\u017eu by\u0165 pou\u017eit\u00e9 na naru\u0161enie \u0161trukt\u00fary logu a vykon\u00e1vanie akci\u00ed pri zobrazovan\u00ed v\u00fdstupu pr\u00edkazu «tuned-adm get_instances» v termin\u00e1li. EVIL=`echo -e «this is\nevil\033[?1047h»` gdbus call -y -d com.redhat.tuned -o \/Tuned -m com.redhat.tuned.control.instance_create cpu «$EVIL» ‘{«devices»: «*»}’ <\/p>\n

Zranite\u013enosti sa prejavuj\u00fa od verzie tuned 2.23, vytvorenej za\u010diatkom j\u00fana 2024, a boli odstr\u00e1nen\u00e9 v vydan\u00ed tuned 2.24.1. V hlavn\u00fdch distrib\u00faci\u00e1ch boli probl\u00e9my opraven\u00e9 v RHEL 9, Fedora 40, Arch Linux a Gentoo. V stabiln\u00fdch vetv\u00e1ch Ubuntu, Debian a SUSE\/openSUSE sa zranite\u013enosti neprejavuj\u00fa, preto\u017ee obsahuj\u00fa star\u0161ie verzie tuned (<2.23), ktor\u00e9 nie s\u00fa n\u00e1chyln\u00e9 na zranite\u013enosti.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Red Hat \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 tuned, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0449\u0435\u043c \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044e \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u044f\u0434\u0440\u0430 \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u0442\u0435\u043a\u0443\u0449\u0435\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-52336), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f 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\u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b «script_pre» \u0438 «script_post» \u0434\u043b\u044f \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u044f \u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0432, […]<\/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-120749","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\udd47Zranite\u013enos\u0165 v tuned, ktor\u00e1 umo\u017e\u0148uje vykon\u00e1va\u0165 k\u00f3d s 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