{"id":105336,"date":"2022-10-19T15:37:24","date_gmt":"2022-10-19T13:37:24","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-io_uring-yadra-linux-pozvolyayushhaya-povysit-privilegii-v-sisteme"},"modified":"2022-10-19T15:37:24","modified_gmt":"2022-10-19T13:37:24","slug":"uyazvimost-v-podsisteme-io_uring-yadra-linux-pozvolyayushhaya-povysit-privilegii-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-podsisteme-io_uring-yadra-linux-pozvolyayushhaya-povysit-privilegii-v-sisteme","title":{"rendered":"O vulnerabilitate \u00een subsistemul io_uring al nucleului Linux, care permite cre\u0219terea privilegiilor \u00een sistem","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen implementarea interfe\u021bei de intrare\/ie\u0219ire asincron\u0103 io_uring, inclus\u0103 \u00een nucleul Linux \u00eencep\u00e2nd cu versiunea 5.1, a fost descoperit\u0103 o vulnerabilitate (CVE-2022-2602) care permite unui utilizator neprivilegiat s\u0103 ob\u021bin\u0103 drepturi de root \u00een sistem. Problema a fost confirmat\u0103 \u00een ramura 5.4 \u0219i \u00een nucleele \u00eencep\u00e2nd cu ramura 5.15. <\/p>\n

Vulnerabilitatea este cauzat\u0103 de accesarea unui bloc de memorie deja eliberat (use-after-free) \u00een subsistemul io_uring, care apare ca urmare a unei condi\u021bii de competi\u021bie \u00een procesarea unei cereri io_uring asupra unui fi\u0219ier \u021bint\u0103 \u00een timpul execu\u021biei colectorului de gunoi pentru socket-urile Unix, dac\u0103 colectorul de gunoi elibereaz\u0103 toate descriptorii de fi\u0219iere \u00eenregistra\u021bi \u0219i descriptorul de fi\u0219ier cu care lucreaz\u0103 io_uring. Pentru a crea artificial condi\u021biile pentru manifestarea vulnerabilit\u0103\u021bii, se poate \u00eent\u00e2rzia cererea folosind userfaultfd p\u00e2n\u0103 c\u00e2nd se activeaz\u0103 eliberarea memoriei de c\u0103tre colectorul de gunoi. <\/p>\n

Cercet\u0103torii care au descoperit problema au anun\u021bat crearea unui exploit func\u021bional, pe care inten\u021bioneaz\u0103 s\u0103 \u00eel publice pe 25 octombrie, pentru a oferi utilizatorilor timp s\u0103 instaleze actualiz\u0103ri. O solu\u021bie este disponibil\u0103 \u00een prezent sub form\u0103 de patch. Actualiz\u0103rile pentru distribu\u021bii nu au fost \u00eenc\u0103 lansate, dar pot fi urm\u0103rite pe paginile: Debian, Ubuntu, Gentoo, RHEL, Fedora, SUSE\/openSUSE, Arch.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 io_uring, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0432 \u044f\u0434\u0440\u043e Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 5.1, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-2602), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u043e \u0432 \u0432\u0435\u0442\u043a\u0435 5.4 \u0438 \u044f\u0434\u0440\u0430\u0445 \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0442\u043a\u0438 5.15. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435\u043c \u043a \u0443\u0436\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u043e\u043c\u0443 \u0431\u043b\u043e\u043a\u0443 \u043f\u0430\u043c\u044f\u0442\u0438 (use-after-free) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 io_uring, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u044f \u0433\u043e\u043d\u043a\u0438 […]<\/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-105336","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\udd47 Vulnerabilitate \u00een subsistemul io_uring al nucleului Linux, care permite cre\u0219terea privilegiilor \u00een sistem | ProHoster","description":"\u00cen implementarea interfe\u021bei de intrare\/ie\u0219ire asincron\u0103 io_uring, inclus\u0103 \u00een nucleul Linux \u00eencep\u00e2nd cu versiunea 5.1, a fost descoperit\u0103 o vulnerabilitate (CVE-2022-2602) care permite unui utilizator neprivilegiat s\u0103 ob\u021bin\u0103 drepturi de root \u00een.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-podsisteme-io_uring-yadra-linux-pozvolyayushhaya-povysit-privilegii-v-sisteme","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","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\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 io_uring \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 | ProHoster","og:description":"\u0412 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 io_uring, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0433\u043e \u0432 \u044f\u0434\u0440\u043e Linux \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 5.1, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-2602), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \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 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root 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