{"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\/cs\/blog\/news\/uyazvimost-v-tuned-pozvolyayushhaya-vypolnit-kod-s-pravami-root","title":{"rendered":"Zranitelnost v tuned, kter\u00e1 umo\u017e\u0148uje vykon\u00e1n\u00ed k\u00f3du s pr\u00e1vy root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ve vyv\u00edjen\u00e9m pozad\u00ed procesu tuned spole\u010dnosti Red Hat, kter\u00fd automaticky optimalizuje nastaven\u00ed hardwaru a j\u00e1dra v z\u00e1vislosti na aktu\u00e1ln\u00edm zat\u00ed\u017een\u00ed, byla zji\u0161t\u011bna zranitelnost (CVE-2024-52336), kter\u00e1 umo\u017e\u0148uje lok\u00e1ln\u00edmu nep\u0159ihl\u00e1\u0161en\u00e9mu u\u017eivateli vykon\u00e1vat jak\u00e9koli p\u0159\u00edkazy s pr\u00e1vy root. <\/p>\n

Probl\u00e9m je v implementaci DBus metody «com.redhat.tuned.instance_create», pou\u017e\u00edvan\u00e9 k vytv\u00e1\u0159en\u00ed instanc\u00ed plugin\u016f, do kter\u00e9 je mo\u017en\u00e9 p\u0159edat parametry «script_pre» a «script_post» pro ur\u010den\u00ed skript\u016f, kter\u00e9 budou provedeny p\u0159ed nebo po vytvo\u0159en\u00ed instance pluginu. Probl\u00e9m spo\u010d\u00edv\u00e1 v tom, \u017ee nastaven\u00ed Polkit umo\u017e\u0148uje jak\u00e9mukoli p\u0159ihl\u00e1\u0161en\u00e9mu m\u00edstn\u00edmu u\u017eivateli bez autentizace odeslat DBus po\u017eadavek na tuto metodu, zat\u00edmco samotn\u00fd proces tuned b\u011b\u017e\u00ed s pr\u00e1vy roota a spou\u0161t\u00ed skripty uveden\u00e9 v parametrech «script_pre» a «script_post» tak\u00e9 s pr\u00e1vy roota. Nap\u0159\u00edklad pro spu\u0161t\u011bn\u00ed skriptu \/path\/to\/myscript.sh s pr\u00e1vy roota sta\u010d\u00ed, aby u\u017eivatel provedl p\u0159\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 metod\u011b «com.redhat.tuned.instance_create» existuje tak\u00e9 m\u00e9n\u011b nebezpe\u010dn\u00e1 zranitelnost (CVE-2024-52337), zp\u016fsoben\u00e1 absenc\u00ed \u010di\u0161t\u011bn\u00ed hodnoty s n\u00e1zvem instance pluginu p\u0159i jej\u00edm v\u00fdstupu do logu. \u00dato\u010dn\u00edk m\u016f\u017ee p\u0159idat n\u00e1zev obsahuj\u00edc\u00ed znak pro nov\u00fd \u0159\u00e1dek a escape sekvence pro emul\u00e1tor termin\u00e1lu, kter\u00e9 mohou b\u00fdt vyu\u017eity k naru\u0161en\u00ed struktury logu a prov\u00e1d\u011bn\u00ed akc\u00ed p\u0159i zobrazov\u00e1n\u00ed v\u00fdstupu p\u0159\u00edkazu «tuned-adm get_instances» v termin\u00e1lu. 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

Zranitelnosti se projevuj\u00ed po\u010d\u00ednaje verz\u00ed tuned 2.23, vydanou na za\u010d\u00e1tku \u010dervna 2024, a byly odstran\u011bny ve verzi tuned 2.24.1. V hlavn\u00edch distribuc\u00edch byly probl\u00e9my opraveny v RHEL 9, Fedora 40, Arch Linux a Gentoo. Ve stabiln\u00edch v\u011btv\u00edch Ubuntu, Debian a SUSE\/openSUSE zranitelnosti neexistuj\u00ed, proto\u017ee obsahuj\u00ed star\u0161\u00ed verze tuned (<2.23), kter\u00e9 nejsou n\u00e1chyln\u00e9 k zranitelnostem.
\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 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043b\u044e\u0431\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 DBus-\u043c\u0435\u0442\u043e\u0434\u0430 «com.redhat.tuned.instance_create», \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u043e\u0432 \u043f\u043b\u0430\u0433\u0438\u043d\u043e\u0432, \u0432 \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\udd47Zranitelnost v tuned, umo\u017e\u0148uj\u00edc\u00ed vykon\u00e1vat k\u00f3d s pr\u00e1vy root | 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