{"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\/it\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp","title":{"rendered":"Rilascio di OpenSSH 8.3 con correzione della vulnerabilit\u00e0 in scp","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo tre mesi di sviluppo <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2020-May\/038528.html\">presentato<\/a><\/noindex> rilascio <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openssh.com\/\">OpenSSH 8.3<\/a><\/noindex>, implementazione open source di client e server per il funzionamento sui protocolli SSH 2.0 e SFTP. <\/p>\n<p>Nella nuova versione \u00e8 stata aggiunta una protezione contro gli attacchi a scp, che consente al server di inviare nomi di file diversi da quelli richiesti (a differenza della <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49953\">precedente vulnerabilit\u00e0<\/a><\/noindex>, l'attacco non consente di cambiare la directory o la maschera glob selezionata dall'utente). Ricordiamo che in SCP il server decide quali file e directory inviare al client, mentre il client verifica solo la correttezza dei nomi degli oggetti restituiti. Il problema identificato consiste nel fatto che se la chiamata di sistema utimes termina con un errore, il contenuto del file viene interpretato come metadati del file. <\/p>\n<p>Questa funzionalit\u00e0, quando si connettono a un server controllato da un attaccante, pu\u00f2 essere utilizzata per salvare nel file system dell'utente nomi di file diversi e altro contenuto durante la copia tramite scp in configurazioni che portano a fallimenti nella chiamata di utimes (ad esempio, quando utimes \u00e8 bloccato dalla policy SELinux o da un filtro di chiamate di sistema). La probabilit\u00e0 di attacchi reali \u00e8 considerata minima, poich\u00e9 nelle configurazioni tipiche la chiamata a utimes non fallisce. Inoltre, l'attacco non passa inosservato \u2014 durante la chiamata a scp viene mostrato un errore di trasmissione dati.<\/p>\n<p>Modifiche generali:<\/p>\n<ul>\n<li class=\"l\"> In sftp \u00e8 stata interrotta l'elaborazione dell'argomento \u00ab-1\u00bb analogamente a ssh e scp, che prima veniva accettato ma ignorato;\n<li class=\"l\"> In sshd, utilizzando IgnoreRhosts, ora sono disponibili tre opzioni: \u00abyes\u00bb \u2014 ignorare rhosts\/shosts, \u00abno\u00bb \u2014 considerare rhosts\/shosts e \u00abshosts-only\u00bb \u2014 consentire \u00ab.shosts\u00bb, ma vietare \u00ab.rhosts\u00bb;\n<li class=\"l\"> In ssh \u00e8 garantita l'elaborazione della sostituzione %TOKEN nelle impostazioni LocalFoward e RemoteForward, utilizzate per reindirizzare i socket Unix;\n<li class=\"l\"> Consentita la lettura delle chiavi pubbliche da file non crittografati contenenti la chiave privata, se non \u00e8 presente un file separato con la chiave pubblica;\n<li class=\"l\"> Se nel sistema \u00e8 presente libcrypto, ora ssh e sshd utilizzano l'implementazione dell'algoritmo chacha20 da questa libreria, invece dell'implementazione portatile incorporata che \u00e8 meno performante;\n<li class=\"l\"> \u00c8 stata implementata la possibilit\u00e0 di eseguire il dump del contenuto della lista binaria dei certificati revocati eseguendo il comando \u00abssh-keygen -lQf \/path\u00bb;\n<li class=\"l\"> Nella versione portatile \u00e8 stata implementata l'identificazione dei sistemi in cui i segnali con l'opzione SA_RESTART interrompono l'esecuzione di select;\n<li class=\"l\"> Risolti problemi di compilazione nei sistemi HP\/UX e AIX;\n<li class=\"l\"> Risolviti problemi di compilazione della sandbox seccomp in alcune configurazioni di Linux;\n<li class=\"l\"> Migliorata la rilevazione della libreria libfido2 e risolti i problemi di compilazione con l'opzione \u00ab--with-security-key-builtin\u00bb.\n<\/ul>\n<p>Gli sviluppatori di OpenSSH hanno ancora una volta avvisato del prossimo declassamento degli algoritmi che utilizzano hash SHA-1, in relazione a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">l'aumento<\/a><\/noindex> efficacia degli attacchi di collisione con prefisso specificato (il costo per trovare una collisione \u00e8 stimato in circa 45.000 dollari). In una delle prossime versioni si prevede di disabilitare di default l'uso dell'algoritmo di firma digitale a chiave pubblica \u00abssh-rsa\u00bb, menzionato nel RFC originale per il protocollo SSH e rimane ampiamente utilizzato nella pratica (per verificare l'uso di ssh-rsa nei propri sistemi, \u00e8 possibile provare a connettersi tramite ssh con l'opzione \u00ab-oHostKeyAlgorithms=-ssh-rsa\u00bb).<\/p>\n<p>Per facilitare la transizione verso i nuovi algoritmi, in una delle prossime versioni di OpenSSH verr\u00e0 abilitata per impostazione predefinita l'impostazione UpdateHostKeys, che consentir\u00e0 la migrazione automatica dei client verso algoritmi pi\u00f9 sicuri. Tra gli algoritmi raccomandati per la migrazione sono stati menzionati rsa-sha2-256\/512 basati su RFC8332 RSA SHA-2 (supportato da OpenSSH 7.2 e utilizzato per impostazione predefinita), ssh-ed25519 (supportato da OpenSSH 6.5) e ecdsa-sha2-nistp256\/384\/521 basati su RFC5656 ECDSA (supportato da OpenSSH 5.7). <\/p>\n<p>A partire dalla scorsa versione, \u00abssh-rsa\u00bb e \u00abdiffie-hellman-group14-sha1\u00bb sono stati rimossi dall'elenco CASignatureAlgorithms, che definisce gli algoritmi consentiti per la firma digitale di nuovi certificati, poich\u00e9 l'uso di SHA-1 nei certificati \u00e8 associato a rischi aggiuntivi in quanto un attaccante ha tempo illimitato per cercare una collisione per un certificato esistente, mentre il tempo per attacchi ai chiavi host \u00e8 limitato dal timeout di connessione (LoginGraceTime). <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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 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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\/it\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp\" \/>\n\t\t<meta property=\"og:image\" 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per l'uso dei protocolli SSH 2.0 e SFTP. Nella nuova versione \u00e8 stata aggiunta una protezione contro gli attacchi a scp, che consente al server di inviare nomi di file diversi da quelli richiesti (a differenza della vulnerabilit\u00e0 precedente, l'attacco non consente di cambiare la directory o la maschera glob selezionata dall'utente). Ricordiamo che","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/reliz-openssh-8-3-s-ustraneniem-uyazvimosti-v-scp","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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\udd47\u0420\u0435\u043b\u0438\u0437 OpenSSH 8.3 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 scp | ProHoster","og:description":"\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 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