{"id":93183,"date":"2020-09-04T07:42:02","date_gmt":"2020-09-04T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux"},"modified":"2020-09-04T07:42:02","modified_gmt":"2020-09-04T05:42:02","slug":"uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"Vulnerabilitate \u00een implementarea socket-urilor AF_PACKET din kernel-ul Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dup\u0103 trei ani de la valul de vulnerabilit\u0103\u021bi (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) din subsistemul AF_PACKET al nucleului Linux a fost identificat\u0103<\/a><\/noindex> o alt\u0103 problem\u0103 (CVE-2020-14386<\/a><\/noindex>), care permite unui utilizator local f\u0103r\u0103 privilegii s\u0103 execute cod cu drepturi de root sau s\u0103 ias\u0103 din containerele izolate, av\u00e2nd acces root \u00een acestea.<\/p>\n

Pentru a crea un socket AF_PACKET \u0219i a exploata vulnerabilitatea, este necesar\u0103 ob\u021binerea privilegiului CAP_NET_RAW. Cu toate acestea, acest privilegiu poate fi ob\u021binut de utilizatorii f\u0103r\u0103 privilegii \u00een containerele create \u00een sisteme cu suport activat pentru spa\u021biile de nume ale utilizatorilor (user namespaces). De exemplu, user namespaces este activat \u00een mod implicit \u00een Ubuntu \u0219i Fedora, dar nu este activat \u00een Debian \u0219i RHEL. \u00cen Android, dreptul de a crea sockets AF_PACKET este de\u021binut de procesul mediaserver, prin care vulnerabilitatea poate fi exploatat\u0103.<\/p>\n

Vulnerabilitatea este prezent\u0103 \u00een func\u021bia tpacket_rcv \u0219i este cauzat\u0103 de o eroare \u00een calcularea variabilei netoff. Un atacator poate crea condi\u021bii \u00een care valoarea variabilei netoff este mai mic\u0103 dec\u00e2t cea a variabilei maclen, ceea ce va duce la un overflow \u00een calculul \u201emacoff = netoff - maclen\u201d \u0219i la stabilirea incorect\u0103 a unui pointer pe bufferul pentru datele primite. Ca urmare, atacatorul poate ini\u021bia o scriere de la 1 la 10 octe\u021bi \u00een zona din afara bufferului alocat. Se observ\u0103 c\u0103 este dezvoltat un exploit care permite ob\u021binerea de privilegii root \u00een sistem. <\/p>\n

Problema este prezent\u0103 \u00een nucleul din iulie 2008, adic\u0103 se manifest\u0103 \u00een toate nucleele actuale. Corec\u021bia este disponibil\u0103 deocamdat\u0103 sub form\u0103 de patch<\/a><\/noindex>. Actualiz\u0103rile pachetelor \u00een distribu\u021bii pot fi urm\u0103rite pe urm\u0103toarele pagini: Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

<\/a><\/noindex><\/p>\n

Sursa: opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0421\u043f\u0443\u0441\u0442\u044f \u0442\u0440\u0438 \u0433\u043e\u0434\u0430 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u0432\u043e\u043b\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 (1, 2, 3, 4, 5) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 AF_PACKET \u044f\u0434\u0440\u0430 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE-2020-14386), \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 \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0438\u043b\u0438 \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432, \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0432 \u043d\u0438\u0445 root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0414\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u043e\u043a\u0435\u0442\u0430 AF_PACKET \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u0439 CAP_NET_RAW. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, […]<\/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-93183","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\udd47Vulnerabilitate \u00een implementarea socket-urilor AF_PACKET din nucleul Linux | ProHoster","description":"Dup\u0103 trei ani de la valul de vulnerabilit\u0103\u021bi 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