{"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\/et\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp","title":{"rendered":"OpenSSH 8.3 versiooni v\u00e4ljaanne koos scp haavatavuse k\u00f5rvaldamisega","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>P\u00e4rast kolme kuu arendust\u00f6\u00f6d <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2020-May\/038528.html\">esitatud<\/a><\/noindex> v\u00e4ljalase <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openssh.com\/\">OpenSSH 8.3<\/a><\/noindex>, avatud realiseerimisega kliendi ja serveri jaoks, et t\u00f6\u00f6tada SSH 2.0 ja SFTP protokollide kaudu. <\/p>\n<p>Uues v\u00e4ljaandes on lisatud kaitse scp r\u00fcnnaku vastu, mis v\u00f5imaldab serveril edastada teisi failinimesid, mis erinevad n\u00f5utud nimedest (erinevalt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49953\">eelnevast haavatavusest<\/a><\/noindex>, r\u00fcnnak ei v\u00f5imalda valitud katalooge v\u00f5i glob-maski muuta). Tuletame meelde, et SCP-s teeb server otsuse, milliseid faile ja katalooge kliendile saata, samas kui klient kontrollib vaid tagastatud objektide nimede \u00f5igsust. Tuvustatud probleemi sisu on see, et kui s\u00fcsteemik\u00f5ne utimes eba\u00f5nnestub, t\u00f5lgendatakse faili sisu kui faili metaandmeid. <\/p>\n<p>See \u00fchenduse loomisel serveriga, mis on \u00f5igustatult r\u00fcnnaku all, v\u00f5ib kasutada kasutaja failis\u00fcsteemi teiste nimede ja sisuga failide salvestamiseks, kui kopeerida scp-ga konfigureeritud seadetes, mis viivad utimes-i kutsumise eba\u00f5nnestumiseni (n\u00e4iteks kui utimes on SELinuxi poliitika v\u00f5i s\u00fcsteemikutsungite filtri poolt keelatud). Reaalsete r\u00fcnnakute t\u00f5en\u00e4osus on minimaalne, kuna t\u00fc\u00fcpilistes konfiguratsioonides utimes-i kutsumine ei eba\u00f5nnestu. Lisaks ei j\u00e4\u00e4 r\u00fcnnak m\u00e4rkamatuks \u2014 scp kutse k\u00e4ivitamisel kuvatakse andmeedastuse viga.<\/p>\n<p>\u00dcldised muudatused:<\/p>\n<ul>\n<li class=\"l\"> sftp-s on l\u00f5petatud argumendi '-1' k\u00e4sitlemine sarnaselt ssh-le ja scp-le, kus see varem aktsepteeriti, kuid ignoreeriti.\n<li class=\"l\"> sshd-s, kasutades IgnoreRhosts, on n\u00fc\u00fcd saadaval kolm valikut: 'yes' \u2014 ignoreerida rhosts\/shosts, 'no' \u2014 arvestada rhosts\/shosts ja 'shosts-only' \u2014 lubada '.shosts', kuid keelata '.rhosts';\n<li class=\"l\"> ssh-s on tagatud %TOKEN asendamine LocalFoward ja RemoteForward seadetes, mida kasutatakse Unix-sokkide edastamiseks;\n<li class=\"l\"> Avatud v\u00f5tmete \u00fcleslaadimine ilma eraldi avaliku v\u00f5tme failita on lubatud, kui privaatv\u00f5ti on salvestatud avatud v\u00f5tme kasutusele.\n<li class=\"l\"> Kui s\u00fcsteemis on libcrypto, siis ssh ja sshd kasutavad n\u00fc\u00fcd selle teegi chacha20 algoritmi teostust, mitte kaasaskantavat implementeeringut, mis j\u00e4\u00e4b j\u00f5udluses maha.\n<li class=\"l\"> T\u00f6\u00f6tav on rakendatud taimede loendi sisu v\u00e4ljav\u00f5ttete valideerimiseks k\u00e4su 'ssh-keygen -lQf \/path' t\u00e4itmisel;\n<li class=\"l\"> Kaasaskantavas versioonis on realiseeritud s\u00fcsteemide tuvastamine, kus SA_RESTART v\u00f5imalusega signaalid katkestavad select t\u00f6\u00f6d.\n<li class=\"l\"> Probleemid koostamisel HP\/UX ja AIX s\u00fcsteemides on lahendatud.\n<li class=\"l\"> Probleemid seccomp sandboxi ehitamisel teatud Linuxi konfiguratsioonides on k\u00f5rvaldatud.\n<li class=\"l\"> Parandatud on libfido2 teekide m\u00e4\u00e4ratlemise t\u00e4psust ja lahendatud on koostamise probleemid valiku '--with-security-key-builtin' korral.\n<\/ul>\n<p>OpenSSH arendajad on j\u00e4lle hoiatavad SHA-1 hash'e kasutavate algoritmide peatsest \u00fcleminekust vananenud kategooriasse. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">kolletsioonir\u00fcnnakute efektiivsus kasvab<\/a><\/noindex> konflikti r\u00fcnnakute efektiivsuse osas (kokkuv\u00f5tte kollisiooni m\u00e4\u00e4rimise hind on hinnanguliselt umbes 45 000 dollarit). \u00dches j\u00e4rgmistest v\u00e4ljaannetest plaanitakse vaikevaates keelata avaliku v\u00f5tme digitaalallkirja algoritmi 'ssh-rsa' kasutamine, mis on mainitud SSH protokolli originaalses RFC-s ja on praktikas endiselt laialdaselt levinud (ssh-rsa rakendamise kontrollimiseks oma s\u00fcsteemides v\u00f5ib proovida ssh-ga \u00fchendust luua valikuga '-oHostKeyAlgorithms=-ssh-rsa').<\/p>\n<p>OpenSSH j\u00e4rgmistes v\u00e4ljalasketes muudetakse vaikimisi seade nimega UpdateHostKeys, mis v\u00f5imaldab automaatselt viia kliendid \u00fcle usaldusv\u00e4\u00e4rsematele algoritmidele, et sujuvamaks muuta \u00fcleminek uutele algoritmidele. Soovitatavateks \u00fclemineku algoritmideks on rsa-sha2-256\/512, mis p\u00f5hineb RFC8332 RSA SHA-2-l (toetatakse alates OpenSSH 7.2 ja kasutatakse vaikimisi), ssh-ed25519 (toetatakse alates OpenSSH 6.5), ja ecdsa-sha2-nistp256\/384\/521, mis p\u00f5hineb RFC5656 ECDSA-l (toetatakse alates OpenSSH 5.7). <\/p>\n<p>Alates eelmisest v\u00e4ljaandest on 'ssh-rsa' ja 'diffie-hellman-group14-sha1' eemaldatud CASignatureAlgorithms loendist, mis m\u00e4\u00e4ratleb uute sertifikaatide digitaalallkirja lubatud algoritmid, kuna SHA-1 kasutamine sertifikaatidesse on seotud t\u00e4iendava riskiga, kuna r\u00fcndajal on piiramatult aega olemasoleva sertifikaadi kollisiooni leidmiseks, samas kui r\u00e4ndava v\u00f5tme r\u00fcnnakute aeg on piiratud \u00fchenduse aegumisega (LoginGraceTime). <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - 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 \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,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta 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\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,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp\" \/>\n\t\t<meta property=\"og:image\" 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Uues versioonis on lisatud kaitse scp r\u00fcnnaku eest, mis v\u00f5imaldab serveril edastada teisi failinimesid, mis erinevad n\u00f5utud omadest (erinevalt varasemast haavatavusest, ei v\u00f5imalda r\u00fcnnak valida kasutaja katalooge v\u00f5i glob-mustreid). 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