{"id":109268,"date":"2023-07-06T03:10:18","date_gmt":"2023-07-06T01:10:18","guid":{"rendered":"https:\/\/prohoster.info\/?p=109268"},"modified":"2023-07-06T09:41:48","modified_gmt":"2023-07-06T07:41:48","slug":"uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-stackrot-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Vulnerabilitatea StackRot \u00een nucleul Linux, care permite cre\u0219terea privilegiilor","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Realizat \u00een nucleul Linux 6.1, traducerea VMA (Virtual Memory Area) de la structura de date \u201ered-black tree\u201d la \u201emaple tree\u201d a dus la apari\u021bia unei vulnerabilit\u0103\u021bi (CVE-2023-3269) care permite unui utilizator nepriviligiat s\u0103 execute codul s\u0103u cu drepturi de nucleu. Vulnerabilitatea, cunoscut\u0103 sub numele de StackRot, se manifest\u0103 \u00eencep\u00e2nd cu versiunea nucleului 6.1 \u0219i a fost corectat\u0103 \u00een actualiz\u0103rile 6.4.1, 6.3.11 \u0219i 6.1.37. <\/p>\n

Structura \u201emaple tree\u201d este o variant\u0103 de B-tree, care suport\u0103 indexarea pe intervale de valori \u0219i este proiectat\u0103 pentru a utiliza eficient cache-ul procesorilor moderni. Comparativ cu \u201ered-black tree\u201d, utilizarea \u201emaple tree\u201d ofer\u0103 o performan\u021b\u0103 mai bun\u0103. Vulnerabilitatea este cauzat\u0103 de o eroare \u00een handler-ul de extensie a stivei \u2014 \u00een structura \u201emaple tree\u201d, utilizat\u0103 pentru gestionarea zonelor de memorie virtual\u0103 \u00een nucleu, \u00eenlocuirea unui nod \u00een arbore putea avea loc f\u0103r\u0103 a seta un lock pe scriere, ceea ce crea condi\u021bii pentru accesul la zona de memorie dup\u0103 ce a fost eliberat\u0103 (use-after-free). <\/p>\n

Exploatarea vulnerabilit\u0103\u021bii a fost complicat\u0103 de faptul c\u0103 nodurile din structura \u201emaple tree\u201d sunt eliberate \u00een mod \u00eent\u00e2rziat folosind apeluri callback cu bloc\u0103ri RCU (Read-copy-update). Cu toate acestea, cercet\u0103torii au reu\u0219it s\u0103 dep\u0103\u0219easc\u0103 dificult\u0103\u021bile \u00eent\u00e2mpinate \u0219i s\u0103 preg\u0103teasc\u0103 un exploit func\u021bional, pe care inten\u021bioneaz\u0103 s\u0103-l publice la sf\u00e2r\u0219itul lunii iulie, pentru a oferi utilizatorilor timp s\u0103-\u0219i actualizeze sistemele. Exploatarea este posibil\u0103 \u00een aproape toate configura\u021biile nucleului \u0219i necesit\u0103 doar privilegii minime.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 «red-black tree» \u043d\u0430 «maple tree» \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \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 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f StackRot, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u044f\u0434\u0440\u0430 6.1 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 6.4.1, 6.3.11 \u0438 6.1.37. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 «maple […]<\/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-109268","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\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\udd47Vulnerabilitatea StackRot \u00een nucleul Linux, care permite cre\u0219terea privilegiilor | ProHoster","description":"Transformarea VMA (Virtual Memory Area) din nucleul Linux 6.1 de la structura de date \"red-black tree\" la \"maple tree\" a dus la apari\u021bia unei vulnerabilit\u0103\u021bi (CVE-2023-3269) care permite unui utilizator f\u0103r\u0103 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ProHoster","og:description":"\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux 6.1 \u043f\u0435\u0440\u0435\u0432\u043e\u0434 VMA (Virtual Memory Area) \u0441\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0434\u0430\u043d\u043d\u044b\u0445 "red-black tree" \u043d\u0430 "maple tree" \u043f\u0440\u0438\u0432\u0451\u043b \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2023-3269), \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 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