Foi revelada a informa\u00e7\u00e3o sobre a sexta vulnerabilidade (1, 2-3, 4, 5), permitindo que um usu\u00e1rio local n\u00e3o privilegiado obtenha direitos de root, sobrescrevendo dados no cache de p\u00e1ginas. A vulnerabilidade recebeu o nome de c\u00f3digo PinTheft. Um prot\u00f3tipo de exploit est\u00e1 dispon\u00edvel. O identificador CVE ainda n\u00e3o foi atribu\u00eddo. A corre\u00e7\u00e3o est\u00e1 dispon\u00edvel apenas na forma de um patch, publicado em 5 de maio e aceito na branch netdev em 11 de maio, mas n\u00e3o inclu\u00eddo em lan\u00e7amentos corretivos do n\u00facleo. <\/p>\n
A vulnerabilidade est\u00e1 presente na implementa\u00e7\u00e3o do protocolo de rede RDS (Reliable Datagram Sockets), destinado \u00e0 troca de mensagens de alta velocidade entre n\u00f3s em um cluster, com lat\u00eancia m\u00ednima e entrega garantida. O ataque \u00e9 poss\u00edvel em sistemas com a subsistema io_uring ativado (io_uring_disabled=0) e um n\u00facleo compilado com as op\u00e7\u00f5es CONFIG_RDS, CONFIG_RDS_TCP e CONFIG_IO_URING. Para que o exploit funcione, deve haver um arquivo execut\u00e1vel dispon\u00edvel para leitura com a flag SUID-root no sistema. <\/p>\n
Para o carregamento autom\u00e1tico do m\u00f3dulo do n\u00facleo rds_tcp, o exploit solicita o envio de dados atrav\u00e9s do RDS utilizando o transporte SO_RDS_TRANSPORT=2. Nota-se que entre as distribui\u00e7\u00f5es Linux testadas, na configura\u00e7\u00e3o padr\u00e3o, o m\u00f3dulo do n\u00facleo rds \u00e9 fornecido apenas no Arch Linux. Para bloquear a vulnerabilidade de forma alternativa, pode-se desativar o carregamento autom\u00e1tico dos m\u00f3dulos do n\u00facleo rds e rds_tcp: rmmod rds_tcp rds printf 'install rds \/bin\/false\ninstall rds_tcp \/bin\/false\n' > \/etc\/modprobe.d\/pintheft.conf <\/p>\n
A vulnerabilidade \u00e9 causada por um erro na implementa\u00e7\u00e3o do mecanismo zerocopy na fun\u00e7\u00e3o rds_message_zcopy_from_user(), que realiza a modifica\u00e7\u00e3o direta dos dados no cache de p\u00e1ginas para eliminar a sobrecarga desnecess\u00e1ria. No caso de falha, n\u00e3o havia limpeza do campo rm->data.op_nents, resultando em uma dupla libera\u00e7\u00e3o do buffer (double-free). A apari\u00e7\u00e3o de um valor incorreto no contador de refer\u00eancias p\u00f4de ser explorada para sobrescrever dados no cache de p\u00e1ginas, devido \u00e0 manipula\u00e7\u00e3o do ponteiro para o buffer fixo io_uring. <\/p>\n
De resto, o mecanismo de explora\u00e7\u00e3o \u00e9 t\u00edpico de todas as vulnerabilidades desta classe \u2014 o atacante consegue fazer com que um arquivo de programa com a flag suid root seja armazenado no cache de p\u00e1ginas, ap\u00f3s o que insere no cabe\u00e7alho ELF o c\u00f3digo para iniciar \/usr\/bin\/sh. Ap\u00f3s essa manipula\u00e7\u00e3o, a execu\u00e7\u00e3o do programa leva ao carregamento na mem\u00f3ria n\u00e3o do arquivo execut\u00e1vel original do armazenamento, mas de uma c\u00f3pia modificada do cache de p\u00e1ginas. Ao contr\u00e1rio de exploits anteriores, a nova variante \u00e9 adaptada apenas para atacar a utilidade 'su', mas tamb\u00e9m pode ser aplicada na presen\u00e7a de programas suid no sistema, como mount, passwd, chsh, newgrp, umount e pkexec. \u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \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 \u043b\u043e\u043a\u0430\u043b\u044c\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, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f PinTheft. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 5 \u043c\u0430\u044f \u0438 11 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442\u0432 \u0432\u0435\u0442\u043a\u0443 netdev, \u043d\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0451\u043d \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-172753","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\udd47PinTheft \u2014 a sexta vulnerabilidade da classe Copy Fail, proporcionando privil\u00e9gios de root no Linux | ProHoster","description":"Foram reveladas informa\u00e7\u00f5es sobre a sexta vulnerabilidade (1, 2-3, 4, 5), permitindo que um usu\u00e1rio local n\u00e3o privilegiado obtenha privil\u00e9gios de root, ao sobrescrever dados no cache de p\u00e1ginas.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","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\udd47PinTheft \u2014 \u0448\u0435\u0441\u0442\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043b\u0430\u0441\u0441\u0430 Copy Fail, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0430\u0432\u0430 root \u0432 Linux | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \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 \u043b\u043e\u043a\u0430\u043b\u044c\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, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"