V OpenBSD je implementovan\u00e1 technika ochrany proti zneu\u017e\u00edvaniu zranite\u013enost\u00ed, ktor\u00e1 je zalo\u017een\u00e1 na n\u00e1hodnej prekombin\u00e1cii spustite\u013en\u00e9ho s\u00faboru sshd pri ka\u017edom spusten\u00ed syst\u00e9mu. Predt\u00fdm sa podobn\u00e1 technika prekombin\u00e1cie pou\u017e\u00edvala na jadro a kni\u017enice libc.so, libcrypto.so a ld.so, a teraz bude aplikovan\u00e1 aj na niektor\u00e9 spustite\u013en\u00e9 s\u00fabory. V bl\u00edzkej bud\u00facnosti sa pl\u00e1nuje t\u00e1to met\u00f3da implementova\u0165 aj pre ntpd a \u010fal\u0161ie serverov\u00e9 aplik\u00e1cie. Zmena u\u017e bola zahrnut\u00e1 do vetvy CURRENT a bude navrhnut\u00e1 v vydan\u00ed OpenBSD 7.3. <\/p>\n
Prekomponovanie umo\u017e\u0148uje robi\u0165 nezvy\u010dajn\u00fdmi posuny funkci\u00ed v kni\u017eniciach, \u010do s\u0165a\u017euje vytv\u00e1ranie exploitov vyu\u017e\u00edvaj\u00facich met\u00f3dy n\u00e1vratovo orientovan\u00e9ho programovania (ROP \u2014 Return-Oriented Programming). Pri pou\u017eit\u00ed techniky ROP sa \u00fato\u010dn\u00edk nesna\u017e\u00ed umiestni\u0165 svoj k\u00f3d do pam\u00e4te, ale manipuluje s u\u017e existuj\u00facimi kusmi strojov\u00fdch in\u0161trukci\u00ed v na\u010d\u00edtan\u00fdch kni\u017eniciach, ktor\u00e9 sa kon\u010dia pokynom na n\u00e1vrat riadenia (zvy\u010dajne ide o ukon\u010denia kni\u017eni\u010dn\u00fdch funkci\u00ed). Pr\u00e1ca exploit sa zameriava na budovanie re\u0165azca volan\u00ed podobn\u00fdch blokov (\u201egadgets\u201c) na z\u00edskanie po\u017eadovanej funk\u010dnosti. \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\udd47V OpenBSD bola pre sshd pou\u017eit\u00e1 prekombin\u00e1cia po\u010das spustenia | ProHoster","description":"V OpenBSD je implementovan\u00e1 technika ochrany proti zneu\u017e\u00edvaniu zranite\u013enost\u00ed, ktor\u00e1 je zalo\u017een\u00e1 na n\u00e1hodnej prekombin\u00e1cii spustite\u013en\u00e9ho s\u00faboru sshd pri ka\u017edom spusten\u00ed syst\u00e9mu.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/v-openbsd-dlya-sshd-primenena-perekomponovka-vo-vremya-zagruzki","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","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\/sk\/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\/sk\/wp-json\/wp\/v2\/posts\/106430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/comments?post=106430"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/106430\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/media?parent=106430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/categories?post=106430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/tags?post=106430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"