{"id":107877,"date":"2023-04-16T12:48:13","date_gmt":"2023-04-16T10:48:13","guid":{"rendered":"https:\/\/prohoster.info\/?p=107877"},"modified":"2023-04-17T17:50:38","modified_gmt":"2023-04-17T15:50:38","slug":"uyazvimost-v-yadre-linux-6-2-pozvolyayushhaya-obojti-zashhitu-ot-atak-spectre-v2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-yadre-linux-6-2-pozvolyayushhaya-obojti-zashhitu-ot-atak-spectre-v2","title":{"rendered":"Vulnerabilidade no n\u00facleo do Linux 6.2 que permite contornar a prote\u00e7\u00e3o contra ataques Spectre v2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Foi identificada uma vulnerabilidade no n\u00facleo do Linux 6.2 (CVE-2023-1998) que desativa a prote\u00e7\u00e3o contra ataques da classe Spectre v2, permitindo o acesso \u00e0 mem\u00f3ria de outros processos executados em diferentes threads SMT ou Hyper Threading, mas em um \u00fanico n\u00facleo f\u00edsico do processador. A vulnerabilidade pode, entre outras coisas, ser usada para vazar dados entre m\u00e1quinas virtuais em sistemas de nuvem. O problema afeta apenas o n\u00facleo do Linux 6.2 e \u00e9 causado pela implementa\u00e7\u00e3o inadequada de otimiza\u00e7\u00f5es destinadas a reduzir as significativas sobrecargas ao aplicar a prote\u00e7\u00e3o contra Spectre v2. A vulnerabilidade foi corrigida na vers\u00e3o experimental do n\u00facleo do Linux 6.3. <\/p>\n

No espa\u00e7o do usu\u00e1rio, para proteger contra ataques da classe Spectre, os processos podem desativar seletivamente a execu\u00e7\u00e3o especulativa de instru\u00e7\u00f5es usando prctl PR_SET_SPECULATION_CTRL ou utilizar filtragem de chamadas de sistema com base no mecanismo seccomp. De acordo com os pesquisadores que identificaram o problema, a otimiza\u00e7\u00e3o inadequada no n\u00facleo 6.2 deixou a prote\u00e7\u00e3o insuficiente. m\u00e1quinas virtuais<\/a> em pelo menos um grande provedor de nuvem, apesar da ativa\u00e7\u00e3o do modo de bloqueio contra ataques spectre-BTI por meio do prctl. A vulnerabilidade tamb\u00e9m se manifesta em sistemas servidores<\/a> com o kernel 6.2, ao carregar os quais \u00e9 utilizada a configura\u00e7\u00e3o «spectre_v2=ibrs. <\/p>\n

A ess\u00eancia da vulnerabilidade \u00e9 que, ao selecionar os modos de prote\u00e7\u00e3o IBRS ou eIBRS, as otimiza\u00e7\u00f5es implementadas desabilitavam a aplica\u00e7\u00e3o do mecanismo STIBP (Single Thread Indirect Branch Predictors), necess\u00e1rio para bloquear vazamentos ao usar a tecnologia de m\u00faltiplos threads (SMT ou Hyper-Threading). A prote\u00e7\u00e3o contra vazamentos entre threads \u00e9 garantida apenas no modo eIBRS, mas n\u00e3o no IBRS, uma vez que neste \u00faltimo, o bit IBRS, que fornece prote\u00e7\u00e3o contra vazamentos entre n\u00facleos l\u00f3gicos, \u00e9 limpo por motivos de desempenho ao retornar o controle para o espa\u00e7o do usu\u00e1rio, o que torna os threads no espa\u00e7o do usu\u00e1rio desprotegidos contra ataques da classe Spectre v2.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-107877","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\udd47 Vulnerabilidade no n\u00facleo do Linux 6.2 que permite contornar a prote\u00e7\u00e3o contra ataques Spectre v2 | ProHoster","description":"Identificou-se uma vulnerabilidade no n\u00facleo do Linux 6.2 (CVE-2023-1998) que desativa a prote\u00e7\u00e3o contra ataques da classe Spectre v2, permitindo acesso \u00e0 mem\u00f3ria de outros processos executados em diferentes threads SMT ou 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\u044f\u0434\u0440\u0435 Linux 6.2 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-1998), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044e \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u0430\u0442\u0430\u043a \u043a\u043b\u0430\u0441\u0441\u0430 Spectre v2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u0430\u0445 SMT \u0438\u043b\u0438 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