{"id":103053,"date":"2022-01-21T15:36:44","date_gmt":"2022-01-21T13:36:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b"},"modified":"2022-01-21T15:36:44","modified_gmt":"2022-01-21T13:36:44","slug":"%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/%d1%83%d1%8f%d0%b7%d0%b2%d0%b8%d0%bc%d0%be%d1%81%d1%82%d1%8c-%d0%b2-vfs-%d1%8f%d0%b4%d1%80%d0%b0-linux-%d0%bf%d0%be%d0%b7%d0%b2%d0%be%d0%bb%d1%8f%d1%8e%d1%89%d0%b0%d1%8f-%d0%bf%d0%be%d0%b2%d1%8b","title":{"rendered":"Nj\u00eb dob\u00ebsi n\u00eb b\u00ebrtham\u00ebn VFS t\u00eb Linux, e cila mund\u00ebson rritjen e privilegjeve t\u00eb p\u00ebrdoruesit.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

N\u00eb API-n\u00eb e Kontekstit t\u00eb Filesystem-it, e ofruar nga b\u00ebrthama Linux, \u00ebsht\u00eb zbuluar nj\u00eb vulnerabilitet (CVE-2022-0185) q\u00eb lejon nj\u00eb p\u00ebrdorues lokal t\u00eb fitoj\u00eb t\u00eb drejtat e root-it n\u00eb sistem. Hulumtuesi q\u00eb identifikoi problemin publikoi nj\u00eb demonstrim t\u00eb funksionimit t\u00eb eksploitit q\u00eb lejon ekzekutimin e kodit me t\u00eb drejta root n\u00eb Ubuntu 20.04 n\u00eb konfigurimin e saj t\u00eb defaut. Kodi i eksploitit pritet t\u00eb publikohet n\u00eb GitHub brenda jav\u00ebs, pasi distribucionet t\u00eb l\u00ebshojn\u00eb nj\u00eb p\u00ebrdit\u00ebsim me rregullimin e vulnerabilitetit. <\/p>\n

Vulnerabiliteti \u00ebsht\u00eb i pranish\u00ebm n\u00eb funksionin legacy_parse_param() n\u00eb VFS dhe shkaktohet nga mungesa e kontrollit t\u00eb duhur t\u00eb madh\u00ebsis\u00eb maksimale t\u00eb parametrave q\u00eb ofrohen n\u00eb sistemet e skedar\u00ebve q\u00eb nuk mb\u00ebshtesin API-n\u00eb Filesystem Context. N\u00ebse jepet nj\u00eb paramet\u00ebr shum\u00eb i madh, mund t\u00eb shkaktohet mbingarkes\u00eb e nj\u00eb variabli t\u00eb numrit t\u00eb plot\u00eb q\u00eb p\u00ebrdoret p\u00ebr llogaritjen e madh\u00ebsis\u00eb s\u00eb t\u00eb dh\u00ebnave q\u00eb do t\u00eb shkruhen \u2014 n\u00eb kod ka nj\u00eb kontroll p\u00ebr tejkalimin e kufijve t\u00eb tamponit 'if (len > PAGE_SIZE - 2 - size)', i cili nuk funksionon n\u00ebse vlera e size \u00ebsht\u00eb m\u00eb e madhe se 4094 p\u00ebr shkak t\u00eb mbingarkes\u00ebs s\u00eb numrit t\u00eb plot\u00eb p\u00ebrmes n\u00ebnshkurtimit (integer underflow, gjat\u00eb konvertimit t\u00eb 4096 - 2 - 4095 n\u00eb unsigned int merrni 2147483648). <\/p>\n

Gabimi i p\u00ebrmendur lejon q\u00eb, gjat\u00eb aksesimit t\u00eb nj\u00eb imazhi t\u00eb strukturuar t\u00eb FS, t\u00eb shkaktoj\u00eb mbushje t\u00eb tamponit dhe t\u00eb rikopjoj\u00eb t\u00eb dh\u00ebnat e b\u00ebrtham\u00ebs q\u00eb pasojn\u00eb pas zon\u00ebs s\u00eb kujtes\u00ebs s\u00eb ndar\u00eb. P\u00ebr t\u00eb shfryt\u00ebzuar k\u00ebt\u00eb dob\u00ebsi, nevojiten t\u00eb drejtat CAP_SYS_ADMIN, dometh\u00ebn\u00eb, autorizime administratori. Problemi \u00ebsht\u00eb se nj\u00eb p\u00ebrdorues i pakualifikuar mund t\u00eb fitoj\u00eb k\u00ebto autorizime n\u00eb nj\u00eb kontejner t\u00eb izoluar, n\u00ebse mb\u00ebshtetja p\u00ebr hap\u00ebsirat e identifikuesve t\u00eb p\u00ebrdoruesve (user namespaces) \u00ebsht\u00eb aktivizuar n\u00eb sistem. P\u00ebr shembull, hap\u00ebsirat e p\u00ebrdoruesve jan\u00eb aktivizuar normalisht n\u00eb Ubuntu dhe Fedora, por nuk jan\u00eb aktivizuar n\u00eb Debian dhe RHEL (n\u00ebse nuk p\u00ebrdoren platforma t\u00eb izolimit t\u00eb kontejner\u00ebve). <\/p>\n

Problemi shfaqet q\u00eb nga b\u00ebrthama Linux 5.1 dhe \u00ebsht\u00eb riparuar n\u00eb p\u00ebrdit\u00ebsimet e djeshme 5.16.2, 5.15.16, 5.10.93, 5.4.173. P\u00ebrdit\u00ebsimet e paketave q\u00eb rregullojn\u00eb k\u00ebt\u00eb vulnerabilitet tashm\u00eb jan\u00eb l\u00ebshuar p\u00ebr RHEL, Debian, Fedora, Ubuntu. Zgjidhja p\u00ebr momentin nuk \u00ebsht\u00eb e disponueshme n\u00eb Arch Linux, Gentoo, SUSE dhe openSUSE. Si nj\u00eb zgjidhje alternative p\u00ebr mbrojtjen e sistemeve q\u00eb nuk p\u00ebrdorin izolimin e konteiner\u00ebve, mund t\u00eb vendosni vler\u00ebn 0 p\u00ebr sysctl 'user.max_user_namespaces': echo 'user.max_user_namespaces=0' > \/etc\/sysctl.d\/userns.conf # sysctl -p \/etc\/sysctl.d\/userns.conf
\n
Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 API Filesystem Context, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u043c \u044f\u0434\u0440\u043e\u043c Linux, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0185), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u044e \u0440\u0430\u0431\u043e\u0442\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0432 Ubuntu 20.04 \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u041a\u043e\u0434 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u044c \u043d\u0430 GitHub \u0432 \u0442\u0435\u0447\u0435\u043d\u0438\u0435 \u043d\u0435\u0434\u0435\u043b\u0438, \u043f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u044b \u0432\u044b\u043f\u0443\u0441\u0442\u044f\u0442 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u0441 […]<\/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-103053","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"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\udd47Vulnerabilitet n\u00eb VFS-n\u00eb e b\u00ebrtham\u00ebs Linux q\u00eb lejon p\u00ebrmir\u00ebsimin e privilegjeve | ProHoster","description":"N\u00eb API-n\u00eb e Filesystem Context, e ofruar nga b\u00ebrthama e Linux, \u00ebsht\u00eb zbuluar nj\u00eb vulnerabilitet (CVE-2022-0185) q\u00eb i lejon nj\u00eb p\u00ebrdoruesi lokal t\u00eb fitoj\u00eb t\u00eb drejtat root n\u00eb sistem. Hulumtuesi q\u00eb identifikoi problemin publikoi nj\u00eb demonstrim t\u00eb funksionimit t\u00eb eksploatuesit, i cili lejon ekzekutimin e kodit me t\u00eb drejtat root n\u00eb Ubuntu 20.04 n\u00eb konfigurimin e tij t\u00eb zakonsh\u00ebm. 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\u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster","og:description":"\u0412 API Filesystem Context, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u043c \u044f\u0434\u0440\u043e\u043c Linux, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0185), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 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