{"id":120192,"date":"2024-10-15T19:09:13","date_gmt":"2024-10-15T17:09:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-openssh-kod-autentifikaczii-vynesen-v-otdelnyj-proczess-sshd-auth"},"modified":"2024-10-15T19:09:13","modified_gmt":"2024-10-15T17:09:13","slug":"v-openssh-kod-autentifikaczii-vynesen-v-otdelnyj-proczess-sshd-auth","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/v-openssh-kod-autentifikaczii-vynesen-v-otdelnyj-proczess-sshd-auth","title":{"rendered":"I OpenSSH har autentiseringskoden flyttats till en separat process, sshd-auth","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Utvecklarna av OpenSSH har fortsatt att separera sshd i flera olika k\u00f6rbara filer. I det f\u00f6rsta steget av separationen som genomf\u00f6rdes i maj flyttades funktionerna relaterade till sessionhantering till en separat process, sshd-session, medan endast de funktioner som beh\u00f6vs f\u00f6r att ta emot nya n\u00e4tverksanslutningar och starta sshd-session f\u00f6r varje ny session l\u00e4mnades i sshd. Ig\u00e5r gjordes en \u00e4ndring i kodbasen f\u00f6r OpenSSH som lade till ytterligare en process - sshd-auth, dit koden f\u00f6r autentisering flyttades fr\u00e5n sshd-session. <\/p>\n

Processen sshd-auth startas fr\u00e5n sshd-session och m\u00f6jligg\u00f6r att relaterad autentiseringdata isoleras i adressrymden av en separat process, vilket f\u00f6rhindrar \u00e5tkomst till dessa data i minnet om attacker utf\u00f6rs mot koden som anv\u00e4nds f\u00f6r att behandla anslutningsfaserna f\u00f6re avslutandet av autentiseringen. Dessutom kommer f\u00f6r\u00e4ndringen att minska minnesanv\u00e4ndningen n\u00e5got, eftersom den relaterade autentiseringskoden nu endast finns i minnet under autentiseringen och sedan laddas ur vid avslutandet av processen sshd-auth. <\/p>\n

P\u00e5 samma s\u00e4tt som f\u00f6r sshd, ssh-session och ssh-agent till\u00e4mpades en slumpm\u00e4ssig omorganisering av den k\u00f6rbara filen f\u00f6r sshd-auth vid varje systemstart. Den slumpm\u00e4ssiga omorganiseringen g\u00f6r f\u00f6rskjutningarna av funktioner i de k\u00f6rbara filerna och biblioteken sv\u00e5ra att f\u00f6ruts\u00e4ga, vilket g\u00f6r det sv\u00e5rare att skapa exploateringar som anv\u00e4nder metoder f\u00f6r returl\u00e4gesprogrammering (ROP - Return-Oriented Programming). Vid anv\u00e4ndning av ROP-tekniken f\u00f6rs\u00f6ker angriparen inte placera sin kod i minnet, utan arbetar med redan existerande bitar av maskinkodsinstruktioner som avslutas med en returkommando (som vanligtvis \u00e4r slutet p\u00e5 funktioner). Exploatens arbete g\u00e5r ut p\u00e5 att bygga en kedja av anrop till s\u00e5dana block ('gadgets') f\u00f6r att f\u00e5 den \u00f6nskade funktionaliteten.
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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\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\udd47I OpenSSH har autentiseringskoden flyttats till en separat process, sshd-auth | ProHoster","description":"OpenSSH-utvecklarna har fortsatt att dela upp sshd i flera separata k\u00f6rbara 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