Dezvoltatorii OpenSSH au continuat divizarea sshd \u00een mai multe fi\u0219iere executabile separate. \u00cen prima etap\u0103 de divizare, realizat\u0103 \u00een mai, func\u021biile legate de gestionarea sesiunilor au fost mutate din sshd \u00eentr-un proces separat, sshd-session, l\u0103s\u00e2nd \u00een sshd doar func\u021bionalitatea necesar\u0103 pentru a accepta o nou\u0103 conexiune de re\u021bea \u0219i a lansa sshd-session pentru fiecare sesiune nou\u0103. Ieri, \u00een codul surs\u0103 OpenSSH a fost realizat\u0103 o modificare care adaug\u0103 un alt proces \u2014 sshd-auth, \u00een care a fost mutat din sshd-session codul care efectueaz\u0103 autentificarea. <\/p>\n
Procesul sshd-auth este lansat din sshd-session \u0219i permite izolarea suplimentar\u0103 a datelor legate de autentificare \u00een spa\u021biul de adres\u0103 al unui proces separat, ceea ce \u00eempiedic\u0103 accesul la aceste date \u00een memorie \u00een caz de atacuri asupra codului utilizat pentru procesarea etapelor de conexiune \u00eenainte de finalizarea autentific\u0103rii. De asemenea, modificarea reduce u\u0219or consumul de memorie, deoarece codul asociat autentific\u0103rii este prezent \u00een memorie doar \u00een timpul autentific\u0103rii, fiind apoi desc\u0103rcat la finalizarea procesului sshd-auth. <\/p>\n
Prin analogie cu sshd, ssh-session \u0219i ssh-agent, pentru procesul sshd-auth a fost aplicat\u0103 opera\u021bia de rearanjare aleatoare a fi\u0219ierului executabil la fiecare \u00eenc\u0103rcare a sistemului de operare. Rearanjarea aleatoare face ca deplas\u0103rile func\u021biilor din fi\u0219ierele executabile \u0219i biblioteci s\u0103 fie greu de prezis, ceea ce complic\u0103 crearea de exploatatoare care utilizeaz\u0103 tehnici de programare bazate pe returnare (ROP \u2014 Return-Oriented Programming). Folosind tehnica ROP, atacatorul nu \u00eencearc\u0103 s\u0103 plaseze codul s\u0103u \u00een memorie, ci opereaz\u0103 cu deja existente buc\u0103\u021bi de instruc\u021biuni ma\u0219in\u0103, care se termin\u0103 cu o instruc\u021biune de returnare a controlului (de obicei, acestea sunt finalurile func\u021biilor). Func\u021bionarea exploatatorului se rezum\u0103 la construirea unei serii de apeluri ale unor astfel de blocuri (\u201egadgeturi\u201d) pentru a ob\u021bine func\u021bionalitatea dorit\u0103. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 OpenSSH \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0438\u043b\u0438 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 sshd \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u041d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0432 \u043c\u0430\u0435 \u043f\u0435\u0440\u0432\u043e\u043c \u044d\u0442\u0430\u043f\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0438\u0437 sshd \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 sshd-session \u0431\u044b\u043b\u0438 \u0432\u044b\u043d\u0435\u0441\u0435\u043d\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0435\u0430\u043d\u0441\u043e\u0432, \u0430 \u0432 sshd \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043b\u0438\u0448\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u0430\u044f \u0434\u043b\u044f \u043f\u0440\u0438\u0451\u043c\u0430 \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 sshd-session \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0430\u043d\u0441\u0430. \u0412\u0447\u0435\u0440\u0430 \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 OpenSSH \u0431\u044b\u043b\u043e […]<\/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-120192","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\udd47\u00cen OpenSSH, codul de autentificare a fost mutat \u00eentr-un proces separat, sshd-auth | ProHoster","description":"Dezvoltatorii OpenSSH au continuat separarea sshd \u00een mai multe fi\u0219iere executabile 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Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"