{"id":112308,"date":"2023-12-19T03:10:22","date_gmt":"2023-12-19T01:10:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya"},"modified":"2023-12-19T03:10:22","modified_gmt":"2023-12-19T01:10:22","slug":"terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","title":{"rendered":"Terrapin &#8212; SSH protokolli haavatavus, mis v\u00f5imaldab v\u00e4hendada \u00fchenduse kaitset","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ruhr \u00fclikooli teadlaste r\u00fchm Saksamaalt esitles uut SSH MITM-r\u00fcnnakute tehnikat - Terrapin, mis kasutab \u00e4ra protokolli haavatavust (CVE-2023-48795). R\u00fcndaja, kes suudab korraldada MITM-r\u00fcnnaku, v\u00f5ib \u00fchenduse loomise k\u00e4igus blokeerida protokolli laienduste seadistussposti saatmise, et v\u00e4hendada \u00fchenduse kaitset. R\u00fcnnaku teostamise protot\u00fc\u00fcp on avaldatud GitHubis.    <\/p>\n<p>OpenSSH kontekstis v\u00f5imaldab haavatavus n\u00e4iteks tagasi kerida \u00fchenduse kasutamiseks v\u00e4hem turvalisi autentimisalgoritme ja keelata kaitse r\u00fcnnakute eest k\u00f5rvalkanalite kaudu, mis taastavad sisendi, anal\u00fc\u00fcsides klahvivajutuste vahelisi viivitusi. Python'i AsyncSSH raamatukogus koos haavatavusega (CVE-2023-46446) sisemise oleku masina (internal state machine) teostuses v\u00f5imaldab Terrapin r\u00fcnnak siseneda SSH-seanssi.      <\/p>\n<p>Haavatavus m\u00f5jutab k\u00f5iki SSH-implementatsioone, mis toetavad ChaCha20-Poly1305 v\u00f5i CBC-re\u017eiimis t\u00f6\u00f6tavaid \u0161ifreid koos ETM-re\u017eiimiga (Encrypt-then-MAC). N\u00e4iteks on sellised v\u00f5imalused olnud saadaval OpenSSH-s juba \u00fcle 10 aasta. Haavatavus on blokeeritud t\u00e4nases OpenSSH 9.6 v\u00e4ljaandes, samuti PuTTY 0.80, libssh 0.10.6\/0.9.8 ja AsyncSSH 2.14.2 uuendustes. Dropbear SSH-s on parandamine juba koodi lisatud, kuid uut v\u00e4ljaannet pole veel loodud.      <\/p>\n<p>Haavatavus tuleneb sellest, et r\u00fcndaja, kes kontrollib \u00fchenduse liiklust (n\u00e4iteks pahatahtliku traadita punkti omanik), saab korrigeerida pakettide j\u00e4rjestusnumbrid \u00fchenduse l\u00e4bir\u00e4\u00e4kimise k\u00e4igus ja saavutada m\u00e4rkamatult suvalise arvu SSH-s\u00f5numite eemaldamise kliendi poolt saadetud teenuseteateid. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-prohoster\/\"   title=\"serveriga\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3020\">serveriga<\/a>. Lisaks sellele saab r\u00fcndaja kustutada SSH_MSG_EXT_INFO s\u00f5numeid, mida kasutatakse protokolli rakendatavate laienduste seadistamiseks. Selleks, et teine \u200b\u200bpool ei tuvastaks paketi kadumist j\u00e4rjestusnumbrite katkemise t\u00f5ttu, algatab r\u00fcndaja valepaketi saatmise sama j\u00e4rjestusnumbriga, mis on kadunud paketil. Valepakett sisaldab s\u00f5numit lipuga SSH_MSG_IGNORE, mida t\u00f6\u00f6deldes ignoreeritakse.     <center><img decoding=\"async\" alt=\"Terrapin - turvahaave SSH protokollis, mis lubab v\u00e4hendada \u00fchenduse kaitset.\" src=\"\/wp-content\/uploads\/2023\/12\/8e3dad7329f9c01cbef81b7029aabdee.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>R\u00fcnnakut ei saa l\u00e4bi viia voogedastamise kr\u00fcpteerimise ja CTR-i kasutamisel, kuna andmete terviklikkuse rikkumist tuvastatakse rakenduse tasemel. Praktikas on r\u00fcnnaku ohus ainult ChaCha20-Poly1305 kr\u00fcptos\u00fcsteem (chacha20-poly1305@openssh.com), mille puhul olekut j\u00e4lgitakse ainult s\u00f5numite j\u00e4rjestusnumbrite p\u00f5hjal, ja seotud Encrypt-Then-MAC (*-etm@openssh.com) ja CBC re\u017eiimide kombinatsioon.      <\/p>\n<p>OpenSSH 9.6 ja muudes teostustes on r\u00fcnnaku t\u00f5kestamiseks rakendatud protokolli laiend \u201estrict KEX\u201c, mis aktiveeritakse automaatselt, kui k\u00fclg toetab seda. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-los-angeles\/\"   title=\"serverile\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3752\">serverile<\/a> ja klient. Laiends l\u00f5petab \u00fchenduse, kui saabub mingeid erakorralisi v\u00f5i liigseid s\u00f5numeid (n\u00e4iteks SSH_MSG_IGNORE v\u00f5i SSH2_MSG_DEBUG lipuga), mis on saadud \u00fchenduse kokkuleppimise k\u00e4igus, ning nulldab MAC (s\u00f5numi autentimise kood) arvu iga v\u00f5tmevahetuse l\u00f5pus.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60304\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0420\u0443\u0440\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0432 \u0411\u043e\u0445\u0443\u043c\u0435 (\u0413\u0435\u0440\u043c\u0430\u043d\u0438\u044f) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 MITM-\u0430\u0442\u0430\u043a\u0438 \u043d\u0430 SSH &#8212; Terrapin, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u044e\u0449\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-48795) \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435. \u0410\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443, \u0438\u043c\u0435\u0435\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0441 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u043e\u0439 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u0434\u043b\u044f \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0434\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043d\u0430 GitHub. \u0412 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 OpenSSH \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":112309,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-112308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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Terrapin, \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u044e\u0449\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2023-48795) \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435. \u0410\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443, \u0438\u043c\u0435\u0435\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u043e\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0441 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u043e\u0439 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 \u0434\u043b\u044f \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u0437\u0430\u0449\u0438\u0442\u044b \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0434\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043d\u0430 GitHub. \u0412 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 OpenSSH \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-12-19T01:10:22+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-12-19T01:10:22+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Terrapin \u2014 turvahaave SSH protokollis, mis lubab v\u00e4hendada \u00fchenduse kaitset | ProHoster","description":"Rur'i \u00fclikooli teadlaste grupp (Saksamaa) esitles uut MITM-r\u00fcnnaku tehnikat SSH-le - Terrapin, mis \u00e4ra kasutab haavatavust (CVE-2023-48795) protokollis. R\u00fcndaja, kes suudab korraldada MITM-r\u00fcnnaku, on v\u00f5imeline \u00fchenduse kokkuleppimise k\u00e4igus blokeerima s\u00f5numi edastamise, mis v\u00f5imaldab alandada \u00fchenduse kaitse taset. R\u00fcnnaku protot\u00fc\u00fcp on avaldatud GitHubis. OpenSSH kontekstis on haavatavus.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/terrapin-uyazvimost-v-protokole-ssh-pozvolyayushhaya-snizit-zashhitu-soedineniya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","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\udd47Terrapin \u2014 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 SSH, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u043d\u0438\u0437\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0442\u0443 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