{"id":112310,"date":"2023-12-19T03:10:31","date_gmt":"2023-12-19T01:10:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-9-6-c-ustraneniem-uyazvimostej"},"modified":"2023-12-19T03:10:31","modified_gmt":"2023-12-19T01:10:31","slug":"reliz-openssh-9-6-c-ustraneniem-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/reliz-openssh-9-6-c-ustraneniem-uyazvimostej","title":{"rendered":"Objava OpenSSH 9.6 uz ispravke sigurnosnih ranjivosti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Objavljen je OpenSSH 9.6, otvorena implementacija klijenta i servera za rad putem SSH 2.0 i SFTP protokola. U novoj verziji otklonjena su tri sigurnosna problema:     <\/p>\n<ul>\n<li class=\"l\"> Ranljivost u SSH protokolu (CVE-2023-48795, napad &#171;Terrapin&#187;), koji omogu\u0107ava povratak na kori\u0161tenje manje za\u0161ti\u0107enih algoritama autentifikacije tijekom MITM napada i isklju\u010divanje za\u0161tite od napada putem sporednih kanala, koji rekreiraju unos putem analize ka\u0161njenja izme\u0111u pritisaka tipki na tipkovnici. Metoda napada je izlo\u017eena u zasebnoj vijesti.\n<li class=\"l\"> Ranljivost u ssh alatima, koja omogu\u0107uje umetanje proizvoljnih shell komandi kroz manipulaciju vrijednostima korisni\u010dkog imena i hosta koje sadr\u017ee specijalne znakove. Ranljivost mo\u017ee biti iskori\u0161tena ako napada\u010d kontrolira vrijednosti korisni\u010dkog imena i imena hosta koje se \u0161alju u ssh, ProxyCommand i LocalCommand direktive, ili &#171;match exec&#187; blokove, gdje su navedeni zamjenski znakovi kao \u0161to su %u i %h. Na primjer, neispravno korisni\u010dko ime i host mogu biti umetnuti u sustavima koji koriste submodule u Gitu, budu\u0107i da Git ne zabranjuje upotrebu specijalnih znakova u imenu hosta i korisnika. Sli\u010dna ranljivost tako\u0111er se javlja u libssh.\n<li class=\"l\"> Gre\u0161ka u ssh-agentu, zbog koje su se pri dodavanju privatnih klju\u010deva PKCS#11, ograni\u010denja primjenjivala samo na prvi klju\u010d koji je vratio PKCS#11 token. Problem se ne odnosi na obi\u010dne privatne klju\u010deve, FIDO tokene i klju\u010deve bez ograni\u010denja.  <\/ul>\n<p>Ostale promjene:   <\/p>\n<ul>\n<li class=\"l\"> U ssh je dodana zamjena &#171;%j&#187;, koja se pro\u0161iruje u ime hosta navedeno putem ProxyJump direktive.\n<li class=\"l\"> U ssh je dodana podr\u0161ka za postavljanje ChannelTimeout sa strane klijenta, koja se mo\u017ee koristiti za zatvaranje neaktivnih kanala.\n<li class=\"l\"> U ssh, sshd, ssh-add i ssh-keygen dodana je podr\u0161ka za \u010ditanje privatnih ED25519 klju\u010deva u PEM PKCS8 formatu (prije je bio podr\u017ean samo OpenSSH format).\n<li class=\"l\"> U ssh i sshd dodano je pro\u0161irenje protokola za ponovnu pregovaranje algoritama digitalnih potpisa za autentifikaciju javnim klju\u010dem, koje se provodi nakon \u0161to se dobiju podaci o korisni\u010dkom imenu. Na primjer, pomo\u0107u pro\u0161irenja mo\u017ee se selektivno koristiti drugi algoritmi vezani za korisnike kroz navo\u0111enje PubkeyAcceptedAlgorithms unutar &#171;Match user&#187; bloka.\n<li class=\"l\"> U ssh-add i ssh-agent dodan je dodatak protokolu za dodavanje certifikata pri u\u010ditavanju PKCS#11 klju\u010deva, \u0161to omogu\u0107ava kori\u0161tenje certifikata povezanih s privatnim PKCS#11 klju\u010devima u svim OpenSSH alatima koji podr\u017eavaju ssh-agent, a ne samo u ssh-u.\n<li class=\"l\"> Pobolj\u0161ano je odre\u0111ivanje nepodr\u017eanih ili nestabilnih opcija kompajlera, kao \u0161to je &#171;-fzero-call-used-regs&#187; u clang.\n<li class=\"l\"> Kako bi se ograni\u010dila prava procesa sshd u verzijama OpenSolaris koje podr\u017eavaju su\u010delje getpflags(), aktiviran je na\u010din PRIV_XPOLICY umjesto PRIV_LIMIT.      <\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60305\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.6, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0442\u0440\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e: \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0435 SSH (CVE-2023-48795, \u0430\u0442\u0430\u043a\u0430 &#171;Terrapin&#187;), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432 \u0445\u043e\u0434\u0435 MITM-\u0430\u0442\u0430\u043a\u0438 \u043e\u0442\u043a\u0430\u0442\u0438\u0442\u044c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043c\u0435\u043d\u0435\u0435 \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u044b\u0445 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u043e\u0432 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438 \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0442\u0443 \u043e\u0442 \u0430\u0442\u0430\u043a \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u0432\u043e\u0441\u0441\u043e\u0437\u0434\u0430\u044e\u0449\u0438\u043c \u0432\u0432\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 [&hellip;]<\/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-112310","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 9.6, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 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