No OpenBSD, foi implementada uma t\u00e9cnica de prote\u00e7\u00e3o contra a explora\u00e7\u00e3o de vulnerabilidades, baseada na reestrutura\u00e7\u00e3o aleat\u00f3ria do arquivo execut\u00e1vel sshd a cada inicializa\u00e7\u00e3o do sistema. Anteriormente, essa t\u00e9cnica de reestrutura\u00e7\u00e3o era aplicada ao n\u00facleo e \u00e0s bibliotecas libc.so, libcrypto.so e ld.so, e agora ser\u00e1 utilizada tamb\u00e9m para alguns arquivos execut\u00e1veis. Em breve, o m\u00e9todo tamb\u00e9m deve ser implementado para ntpd e outros aplicativos de servidor. A altera\u00e7\u00e3o j\u00e1 est\u00e1 inclu\u00edda na branch CURRENT e ser\u00e1 proposta na vers\u00e3o OpenBSD 7.3. <\/p>\n
A recompila\u00e7\u00e3o torna imprevis\u00edveis os deslocamentos de fun\u00e7\u00f5es nas bibliotecas, dificultando a cria\u00e7\u00e3o de exploits que utilizam m\u00e9todos de Programa\u00e7\u00e3o Orientada a Retorno (ROP \u2014 Return-Oriented Programming). Ao usar a t\u00e9cnica ROP, o atacante n\u00e3o tenta inserir seu c\u00f3digo na mem\u00f3ria, mas opera com peda\u00e7os de instru\u00e7\u00f5es de m\u00e1quina j\u00e1 existentes nas bibliotecas carregadas, que terminam com instru\u00e7\u00f5es de retorno de controle (geralmente, s\u00e3o os finalizadores das fun\u00e7\u00f5es de biblioteca). O trabalho do exploit se resume \u00e0 constru\u00e7\u00e3o de uma cadeia de chamadas a esses blocos (\"gadgets\") para obter a funcionalidade desejada. \u0412 OpenBSD \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u0430 \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043d\u0430 \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0435 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 sshd \u043f\u0440\u0438 \u043a\u0430\u0436\u0434\u043e\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0420\u0430\u043d\u0435\u0435 \u043f\u043e\u0434\u043e\u0431\u043d\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u043f\u0435\u0440\u0435\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u043b\u0430\u0441\u044c \u0432 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 \u0438 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a libc.so, libcrypto.so \u0438 ld.so, \u0430 \u0442\u0435\u043f\u0435\u0440\u044c \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0430 \u0438 \u0434\u043b\u044f \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u0412 \u0431\u043b\u0438\u0436\u0430\u0439\u0448\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u043c\u0435\u0442\u043e\u0434 \u0442\u0430\u043a\u0436\u0435 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f ntpd \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439. […]<\/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-106430","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\udd47No OpenBSD, a reestrutura\u00e7\u00e3o do sshd \u00e9 aplicada durante a inicializa\u00e7\u00e3o | ProHoster","description":"No OpenBSD, foi implementada uma t\u00e9cnica de prote\u00e7\u00e3o contra a explora\u00e7\u00e3o de vulnerabilidades, baseada na reestrutura\u00e7\u00e3o aleat\u00f3ria do arquivo execut\u00e1vel sshd a cada inicializa\u00e7\u00e3o do sistema.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/v-openbsd-dlya-sshd-primenena-perekomponovka-vo-vremya-zagruzki","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\udd47\u0412 OpenBSD \u0434\u043b\u044f sshd \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0430 \u043f\u0435\u0440\u0435\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0430 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 | ProHoster","og:description":"\u0412 OpenBSD \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u0430 \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043e\u0442 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043d\u0430 \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0435 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 sshd \u043f\u0440\u0438 \u043a\u0430\u0436\u0434\u043e\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b.","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/v-openbsd-dlya-sshd-primenena-perekomponovka-vo-vremya-zagruzki","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2023-01-20T22:48:13+00:00","article:modified_time":"2023-01-26T20:45:20+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/106430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=106430"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/106430\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=106430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=106430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=106430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"