{"id":100548,"date":"2021-06-20T10:22:54","date_gmt":"2021-06-20T08:22:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-zatragivayushhaya-setevoj-protokol-can-bcm"},"modified":"2021-06-20T10:22:54","modified_gmt":"2021-06-20T08:22:55","slug":"uyazvimost-v-yadre-linux-zatragivayushhaya-setevoj-protokol-can-bcm","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-zatragivayushhaya-setevoj-protokol-can-bcm","title":{"rendered":"Nj\u00eb dob\u00ebsi n\u00eb kernelin Linux, e cila ndikon n\u00eb protokollin rrjetor CAN BCM","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>N\u00eb kernelin Linux \u00ebsht\u00eb identifikuar nj\u00eb vulnerabilitet (CVE-2021-3609) q\u00eb lejon nj\u00eb p\u00ebrdorues lokal t\u00eb ngris\u00eb privilegjet e tij n\u00eb sistem. Problemi \u00ebsht\u00eb shkaktuar nga nj\u00eb gjendje garuese n\u00eb implementimin e protokollit CAN BCM dhe shfaqet n\u00eb versionet e kernelit Linux nga 2.6.25 deri n\u00eb 5.13-rc6. N\u00eb distribucione, problemi ende mbetet i pap\u00ebrmir\u00ebsuar (RHEL, Fedora, Debian, Ubuntu, SUSE, Arch).     <\/p>\n<p>Hulumtuesi q\u00eb identifikoi vulnerabilitetin arriti t\u00eb p\u00ebrgatis\u00eb nj\u00eb exploit p\u00ebr t\u00eb marr\u00eb t\u00eb drejtat e root n\u00eb sistemet me kernela Linux 5.4 dhe m\u00eb t\u00eb reja, duke p\u00ebrfshir\u00eb demonstrimin e mund\u00ebsis\u00eb p\u00ebr t\u00eb realizuar me sukses nj\u00eb sulm n\u00eb Ubuntu 20.04.02 LTS. Nuk p\u00ebrjashtohet mund\u00ebsia e rip\u00ebrpunimit t\u00eb exploit-it p\u00ebr t\u00eb punuar me kernela m\u00eb t\u00eb vjetra (n\u00eb kernelin 5.4 kodi CAN BCM (net\/can\/bcm.c) u kalua nga hrtimer_tasklet n\u00eb HRTIMER_MODE_SOFT).      <\/p>\n<p>Protokolli CAN BCM lejon regjistrimin e nj\u00eb trajtuesi t\u00eb mesazheve q\u00eb vijn\u00eb p\u00ebrmes autobusit CAN (controller area network) dhe lidhjen e tij me nj\u00eb socket t\u00eb caktuar rrjeti. Kur mb\u00ebrrin nj\u00eb mesazh n\u00eb hyrje, thirret funksioni bcm_rx_handler(). Sulmuesi mund t\u00eb shfryt\u00ebzoj\u00eb gjendjen garuese dhe t\u00eb arrij\u00eb mbylljen e socket-it t\u00eb rrjetit n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb me ekzekutimin e bcm_rx_handler(). Kur mbyllet socket-i, thirret funksioni bcm_release(), ku \u00e7lirohet memoria e alokuar p\u00ebr strukturat bcm_op dhe bcm_sock, t\u00eb cilat vazhdojn\u00eb t\u00eb p\u00ebrdoren n\u00eb trajtuesin bcm_rx_handler(). Kjo krijon nj\u00eb situat\u00eb q\u00eb \u00e7on n\u00eb referimin n\u00eb nj\u00eb bllok memorjeje t\u00eb \u00e7liruar tashm\u00eb (use-after-free).    <\/p>\n<p>Sulmi p\u00ebrfshin hapjen e dy socket-eve CAN BCM dhe lidhjen e tyre me nd\u00ebrfaqen vcan. N\u00eb socket-in e par\u00eb, kryhet thirrja sendmsg() me flamurin RX_SETUP p\u00ebr t\u00eb konfiguruar trajtuesin e mesazheve CAN, dhe n\u00eb socket-in e dyt\u00eb kryhet thirrja sendmsg() p\u00ebr t\u00eb d\u00ebrguar mesazhin n\u00eb socket-in e par\u00eb. Pas mb\u00ebrritjes s\u00eb mesazhit, aktivizohet thirrja bcm_rx_handler(), dhe sulmuesi zgjidh momentin e duhur p\u00ebr t\u00eb mbyllur socket-in e par\u00eb, \u00e7ka \u00e7on n\u00eb aktivizimin e bcm_release() dhe \u00e7lirimin e strukturave bcm_op dhe bcm_sock, ndon\u00ebse puna e bcm_rx_handler() ende nuk ka p\u00ebrfunduar.   <\/p>\n<p>\u0427\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u044b\u043c bcm_sock \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u043f\u0435\u0440\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c \u043d\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u044e sk->sk_data_ready(sk), \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0438 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043f\u0440\u0438\u0451\u043c\u043e\u0432 \u0432\u043e\u0437\u0432\u0440\u0430\u0442\u043d\u043e-\u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f (ROP &#8212; Return-Oriented Programming) \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 modprobe_path \u0438 \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 root. \u041f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0442\u0435\u0445\u043d\u0438\u043a\u0438 ROP \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043d\u0435 \u043f\u044b\u0442\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u043c\u0435\u0441\u0442\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438, \u0430 \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u0435\u0442 \u0443\u0436\u0435 \u0438\u043c\u0435\u044e\u0449\u0438\u043c\u0438\u0441\u044f \u0432 \u0437\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0445 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u0445 \u043a\u0443\u0441\u043a\u0430\u043c\u0438 \u043c\u0430\u0448\u0438\u043d\u043d\u044b\u0445 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439, \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u044e\u0449\u0438\u0445\u0441\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0435\u0439 \u0432\u043e\u0437\u0432\u0440\u0430\u0442\u0430 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f (\u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e, \u044d\u0442\u043e \u043e\u043a\u043e\u043d\u0447\u0430\u043d\u0438\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u0447\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0439). \u0420\u0430\u0431\u043e\u0442\u0430 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0441\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043a \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044e \u0446\u0435\u043f\u043e\u0447\u043a\u0438 \u0432\u044b\u0437\u043e\u0432\u043e\u0432 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432 (&#171;\u0433\u0430\u0434\u0436\u0435\u0442\u043e\u0432&#187;) \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043d\u0443\u0436\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438.      <center><img decoding=\"async\" alt=\"Nj\u00eb dob\u00ebsi n\u00eb kernelin Linux, e cila ndikon n\u00eb protokollin rrjetor CAN BCM\" src=\"\/wp-content\/uploads\/2021\/06\/60534f0194a819c8401abf2ec53b3a9a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>          <\/p>\n<p>P\u00ebr sulmin k\u00ebrkohet t\u00eb ket\u00eb akses p\u00ebr t\u00eb krijuar socket-e CAN dhe nj\u00eb nd\u00ebrfaqe rrjeti t\u00eb konfiguruar vcan. T\u00eb drejtat e nevojshme p\u00ebr t\u00eb realizuar sulmin mund t\u00eb fitojn\u00eb nj\u00eb p\u00ebrdorues pa privilegje n\u00eb konteiner\u00ebt e krijuar n\u00eb sistemet me mb\u00ebshtetje t\u00eb aktivizuar p\u00ebr hap\u00ebsirat e emrave t\u00eb identifikuesve t\u00eb p\u00ebrdoruesve (user namespaces). P\u00ebr shembull, user namespaces \u00ebsht\u00eb aktivizuar nga default n\u00eb Ubuntu dhe Fedora, por nuk \u00ebsht\u00eb aktivizuar n\u00eb Debian dhe RHEL.<br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55359\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3609), \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 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 CAN BCM \u0438 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0445 \u044f\u0434\u0440\u0430 Linux \u0441 2.6.25 \u043f\u043e 5.13-rc6. \u0412 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u043a\u0430 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 (RHEL, Fedora, Debian, Ubuntu, SUSE, Arch). \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0441\u043c\u043e\u0433 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100549,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 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\u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u043a\u0430 \u043e\u0441\u0442\u0430\u0451\u0442\u0441\u044f \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 (RHEL, Fedora, Debian, Ubuntu, SUSE, Arch). \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0441\u043c\u043e\u0433 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u0430\u0432 root\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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\u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b CAN BCM | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3609), \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 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 CAN BCM \u0438 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