{"id":83061,"date":"2020-05-28T01:42:22","date_gmt":"2020-05-27T23:42:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp"},"modified":"2020-05-28T01:42:22","modified_gmt":"2020-05-27T23:42:22","slug":"reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp","title":{"rendered":"Vyd\u00e1n\u00ed OpenSSH 8.3 odstranilo zranitelnost v scp","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po t\u0159ech m\u011bs\u00edc\u00edch v\u00fdvoje <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2020-May\/038528.html\">byl p\u0159edstaven<\/a><\/noindex> vyd\u00e1n\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openssh.com\/\">OpenSSH 8.3<\/a><\/noindex>, otev\u0159en\u00e9 implementaci klienta a serveru pro pr\u00e1ci s protokoly SSH 2.0 a SFTP. <\/p>\n<p>V nov\u00e9 verzi byla p\u0159id\u00e1na ochrana proti \u00fatoku na scp, kter\u00fd umo\u017e\u0148uje serveru pos\u00edlat jin\u00e1 jm\u00e9na soubor\u016f odli\u0161n\u00e1 od po\u017eadovan\u00fdch (na rozd\u00edl od <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49953\">minul\u00e9 zranitelnosti<\/a><\/noindex>, \u00fatok neumo\u017e\u0148uje zm\u011bnit vybran\u00fd u\u017eivatelsk\u00fd adres\u00e1\u0159 nebo glob-masku). P\u0159ipome\u0148me, \u017ee u SCP server rozhoduje, jak\u00e9 soubory a adres\u00e1\u0159e poslat klientovi, zat\u00edmco klient pouze ov\u011b\u0159uje spr\u00e1vnost vr\u00e1cen\u00fdch jmen objekt\u016f. Podstata zji\u0161t\u011bn\u00e9ho probl\u00e9mu spo\u010d\u00edv\u00e1 v tom, \u017ee pokud syst\u00e9mov\u00fd vol\u00e1n\u00ed utimes skon\u010d\u00ed chybou, obsah souboru je interpretov\u00e1n jako metadata souboru. <\/p>\n<p>Tato vlastnost p\u0159i p\u0159ipojen\u00ed k serveru kontrolovan\u00e9mu \u00fato\u010dn\u00edkem m\u016f\u017ee b\u00fdt pou\u017eita k uchov\u00e1n\u00ed v souborov\u00e9m syst\u00e9mu u\u017eivatele jin\u00fdch n\u00e1zv\u016f soubor\u016f a jin\u00e9ho obsahu p\u0159i kop\u00edrov\u00e1n\u00ed pomoc\u00ed scp v konfigurac\u00edch, kter\u00e9 vedou k selh\u00e1n\u00ed p\u0159i vol\u00e1n\u00ed utimes (nap\u0159\u00edklad p\u0159i z\u00e1kazu utimes politikou SELinux nebo filtrem syst\u00e9mov\u00fdch vol\u00e1n\u00ed). Pravd\u011bpodobnost proveden\u00ed re\u00e1ln\u00fdch \u00fatok\u016f je hodnocena jako minim\u00e1ln\u00ed, proto\u017ee v typick\u00fdch konfigurac\u00edch se vol\u00e1n\u00ed utimes nezda\u0159\u00ed. Krom\u011b toho \u00fatok neprob\u00edh\u00e1 bez pov\u0161imnut\u00ed \u2014 p\u0159i vol\u00e1n\u00ed scp se zobrazuje chybov\u00e1 zpr\u00e1va o p\u0159enosu dat.<\/p>\n<p>Obecn\u00e9 zm\u011bny:<\/p>\n<ul>\n<li class=\"l\"> V sftp byla zastavena zpracov\u00e1n\u00ed argumentu \u201e-1\u201c na z\u00e1klad\u011b podobnosti s ssh a scp, kter\u00fd byl d\u0159\u00edve p\u0159ijat, ale ignorov\u00e1n;\n<li class=\"l\"> V sshd p\u0159i pou\u017eit\u00ed IgnoreRhosts nyn\u00ed existuj\u00ed t\u0159i mo\u017enosti: \u201eano\u201c \u2014 ignorovat rhosts\/shosts, \u201ene\u201c \u2014 vz\u00edt v \u00favahu rhosts\/shosts a \u201epouze shosts\u201c \u2014 umo\u017enit \u201e.shosts\u201c, ale zak\u00e1zat \u201e.rhosts\u201c;\n<li class=\"l\"> V ssh je zaji\u0161t\u011bno zpracov\u00e1n\u00ed substituce %TOKEN v nastaven\u00edch LocalForward a RemoteForward pou\u017e\u00edvan\u00fdch pro p\u0159esm\u011brov\u00e1n\u00ed Unix-socket\u016f;\n<li class=\"l\"> Bylo povoleno na\u010d\u00edt\u00e1n\u00ed ve\u0159ejn\u00fdch kl\u00ed\u010d\u016f z nezak\u00f3dovan\u00e9ho souboru s priv\u00e1tn\u00edm kl\u00ed\u010dem, pokud chyb\u00ed samostatn\u00fd soubor s ve\u0159ejn\u00fdm kl\u00ed\u010dem;\n<li class=\"l\"> P\u0159i p\u0159\u00edtomnosti v syst\u00e9mu libcrypto nyn\u00ed ssh a sshd pou\u017e\u00edv\u00e1 implementaci algoritmu chacha20 z t\u00e9to knihovny nam\u00edsto vestav\u011bn\u00e9 p\u0159enosn\u00e9 implementace, kter\u00e1 zaost\u00e1v\u00e1 v\u00fdkonem;\n<li class=\"l\"> Byla implementov\u00e1na mo\u017enost dumpu obsahu bin\u00e1rn\u00edho seznamu odvolan\u00fdch certifik\u00e1t\u016f p\u0159i vykon\u00e1v\u00e1n\u00ed p\u0159\u00edkazu \u201essh-keygen -lQf \/cesta\u201c;\n<li class=\"l\"> V p\u0159enosn\u00e9 verzi byla implementov\u00e1na definice syst\u00e9m\u016f, ve kter\u00fdch sign\u00e1ly s mo\u017enost\u00ed SA_RESTART p\u0159eru\u0161uj\u00ed funkci select;\n<li class=\"l\"> Byly vy\u0159e\u0161eny probl\u00e9my se sestaven\u00edm v syst\u00e9mech HP\/UX a AIX;\n<li class=\"l\"> Odstran\u011bny probl\u00e9my se sestaven\u00edm seccomp sandboxu v n\u011bkter\u00fdch konfigurac\u00edch Linuxu;\n<li class=\"l\"> Zlep\u0161eno ur\u010den\u00ed knihovny libfido2 a vy\u0159e\u0161eny probl\u00e9my se sestaven\u00edm s opc\u00ed \u201e--with-security-key-builtin\u201c.\n<\/ul>\n<p>V\u00fdvoj\u00e1\u0159i OpenSSH znovu varovali p\u0159ed bl\u00ed\u017e\u00edc\u00edm se p\u0159eveden\u00edm algoritm\u016f pou\u017e\u00edvaj\u00edc\u00edch hash SHA-1 do stavu zastaralosti, vzhledem k <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">zvy\u0161ov\u00e1n\u00ed<\/a><\/noindex> efektivnosti kolizn\u00edch \u00fatok\u016f s dan\u00fdm prefixem (n\u00e1klady na dolov\u00e1n\u00ed kolize se odhaduj\u00ed na p\u0159ibli\u017en\u011b 45 tis\u00edc dolar\u016f). V jednom z nadch\u00e1zej\u00edc\u00edch vyd\u00e1n\u00ed pl\u00e1nuj\u00ed ve v\u00fdchoz\u00edm nastaven\u00ed zak\u00e1zat mo\u017enost pou\u017eit\u00ed algoritmu digit\u00e1ln\u00edho podpisu na z\u00e1klad\u011b ve\u0159ejn\u00e9ho kl\u00ed\u010de \u201essh-rsa\u201c, kter\u00fd je zm\u00edn\u011bn v p\u016fvodn\u00edm RFC pro protokol SSH a z\u016fst\u00e1v\u00e1 \u0161iroce roz\u0161\u00ed\u0159en\u00fd v praxi (pro ov\u011b\u0159en\u00ed pou\u017eit\u00ed ssh-rsa ve sv\u00fdch syst\u00e9mech m\u016f\u017eete zkusit p\u0159ipojit se p\u0159es ssh s opc\u00ed \u201e-oHostKeyAlgorithms=-ssh-rsa\u201c).<\/p>\n<p>Aby se usnadnil p\u0159echod na nov\u00e9 algoritmy v OpenSSH, bude v jednom z n\u00e1sleduj\u00edc\u00edch vyd\u00e1n\u00ed ve v\u00fdchoz\u00edm nastaven\u00ed povolena nastaven\u00ed UpdateHostKeys, kter\u00e9 umo\u017en\u00ed automatick\u00fd p\u0159echod klient\u016f na spolehliv\u011bj\u0161\u00ed algoritmy. Mezi doporu\u010den\u00e9 algoritmy pro migraci pat\u0159\u00ed rsa-sha2-256\/512 na z\u00e1klad\u011b RFC8332 RSA SHA-2 (podporov\u00e1no od OpenSSH 7.2 a pou\u017e\u00edv\u00e1 se ve v\u00fdchoz\u00edm nastaven\u00ed), ssh-ed25519 (podporov\u00e1no od OpenSSH 6.5) a ecdsa-sha2-nistp256\/384\/521 na z\u00e1klad\u011b RFC5656 ECDSA (podporov\u00e1no od OpenSSH 5.7). <\/p>\n<p>Od posledn\u00edho vyd\u00e1n\u00ed byly \u201essh-rsa\u201c a \u201ediffie-hellman-group14-sha1\u201c odstran\u011bny ze seznamu CASignatureAlgorithms, ur\u010duj\u00edc\u00ed algoritmy povolen\u00e9 pro digit\u00e1ln\u00ed podpis nov\u00fdch certifik\u00e1t\u016f, nebo\u0165 pou\u017eit\u00ed SHA-1 v certifik\u00e1tech s sebou nese dodate\u010dn\u00e9 riziko, proto\u017ee \u00fato\u010dn\u00edk m\u00e1 neomezen\u00fd \u010das na vyhled\u00e1n\u00ed kolize pro existuj\u00edc\u00ed certifik\u00e1t, zat\u00edmco \u010das \u00fatoku na hostitelsk\u00e9 kl\u00ed\u010de je omezen \u010dasov\u00fdm limitem p\u0159ipojen\u00ed (LoginGraceTime). <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53039\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.3, \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\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 scp, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0441\u0435\u0440\u0432\u0435\u0440\u0443 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u0434\u0440\u0443\u0433\u0438\u0435 \u0438\u043c\u0435\u043d\u0430 \u0444\u0430\u0439\u043b\u043e\u0432, \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0449\u0438\u0435\u0441\u044f \u043e\u0442 \u0437\u0430\u043f\u0440\u043e\u0448\u0435\u043d\u043d\u044b\u0445 (\u0432 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0430\u0442\u0430\u043a\u0430 \u043d\u0435 \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043c\u0435\u043d\u0438\u0442\u044c \u0432\u044b\u0431\u0440\u0430\u043d\u043d\u044b\u0439 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u043a\u0430\u0442\u0430\u043b\u043e\u0433 \u0438\u043b\u0438 glob-\u043c\u0430\u0441\u043a\u0443). \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, [&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-83061","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 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