{"id":116883,"date":"2024-07-01T18:05:44","date_gmt":"2024-07-01T16:05:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openssh-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root-na-serverah-s-glibc"},"modified":"2024-07-01T18:05:44","modified_gmt":"2024-07-01T16:05:44","slug":"uyazvimost-v-openssh-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root-na-serverah-s-glibc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-openssh-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root-na-serverah-s-glibc","title":{"rendered":"Vulnerabilit\u00e0 in OpenSSH che consente di eseguire codice remoto con privilegi di root su server con Glibc","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>L'azienda Qualys ha scoperto una vulnerabilit\u00e0 critica (CVE-2024-6387) in OpenSSH che consente l'esecuzione remota di codice con privilegi di root senza autenticazione. La vulnerabilit\u00e0, conosciuta con il nome in codice regreSSHion, si manifesta nella configurazione predefinita a partire dalla versione OpenSSH 8.5 su sistemi con la libreria standard Glibc. <\/p>\n<p>La possibilit\u00e0 di eseguire un attacco \u00e8 stata dimostrata su un sistema a 32 bit con Glibc con la protezione ASLR (randomizzazione dello spazio degli indirizzi) abilitata. Per un attacco riuscito in condizioni di laboratorio sono stati necessari 6-8 ore, durante le quali si <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-prohoster\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3083\">server<\/a> stabilivano continuamente connessioni con la massima intensit\u00e0 consentita nella configurazione di sshd. L'esecuzione dell'attacco \u00e8 semplificata e richiede meno tempo su sistemi senza ASLR o in distribuzioni che utilizzano una versione modificata di OpenSSH, in cui la ri-randomizzazione di ASLR \u00e8 disabilitata per ogni connessione. Si \u00e8 deciso di non pubblicare un prototipo funzionante dell'exploit fino a quando la vulnerabilit\u00e0 non sar\u00e0 stata completamente risolta, ma \u00e8 disponibile una descrizione sufficientemente dettagliata della vulnerabilit\u00e0, il che rende l'emergere di exploit di terze parti solo una questione di tempo.<\/p>\n<p>Non si esclude la possibilit\u00e0 di attacchi anche su sistemi a 64 bit, ma al momento non esiste un exploit funzionante per tali sistemi. Si prevede che un attacco su sistemi a 64 bit richieder\u00e0 molto pi\u00f9 tempo, ma non pi\u00f9 di una settimana. OpenSSH su OpenBSD non \u00e8 suscettibile al problema, poich\u00e9 in questo sistema dal 2001 \u00e8 utilizzato un meccanismo di protezione che blocca classi di attacco simili. In altri sistemi basati su librerie standard diverse da Glibc, \u00e8 teoricamente possibile adattare il metodo per eseguire un attacco (Qualys non ha ancora studiato questa questione). <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 stata corretta nella versione di OpenSSH 9.8 pubblicata oggi (patch). \u00c8 possibile monitorare la pubblicazione di aggiornamenti dei pacchetti nelle distribuzioni visitando le pagine: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, ROSA, Gentoo, ALT Linux, Arch e FreeBSD. Come soluzione temporanea per bloccare la vulnerabilit\u00e0 in sshd_config, \u00e8 possibile impostare il parametro \u00abLoginGraceTime=0\u00bb, ma la disabilitazione del timeout semplificher\u00e0 l'inizio di un attacco di negazione di servizio in caso di molte connessioni superiori ai limiti stabiliti tramite il parametro MaxStartups.<br \/>\nUno dei segni di tentativi di attacco \u00e8 la comparsa nei log di un gran numero di registrazioni \u00abTimeout before authentication\u00bb.<\/p>\n<p>La vulnerabilit\u00e0 \u00e8 emersa a seguito di un cambiamento regressivo incluso nella versione di OpenSSH 8.5, che porta a una condizione di corsa nel codice di gestione dei segnali in sshd. La regressione ha comportato l'interruzione della protezione contro una vecchia vulnerabilit\u00e0 CVE-2006-5051, che si manifestava fino alla versione OpenSSH 4.4 (anno 2006) ed era di natura teorica.<br \/>\nDurante lo sviluppo di OpenSSH 8.5, per errore \u00e8 stato rimosso il blocco \u00ab#ifdef DO_LOG_SAFE_IN_SIGHAND\u00bb dalla funzione sigdie(), che \u00e8 chiamata direttamente dal gestore di SIGALRM.<\/p>\n<p>Il gestore di SIGALRM viene chiamato in sshd in modalit\u00e0 asincrona se il cliente non ha eseguito l'autenticazione entro il tempo limite di connessione (LoginGraceTime, di default 120 secondi). L'attacco si basa sul fatto che il gestore del segnale chiama funzioni non sicure durante l'elaborazione asincrona dei segnali, come syslog(). La funzione syslog() in Glibc non \u00e8 progettata per l'uso in gestori di segnali eseguiti in modo asincrono, poich\u00e9 chiama funzioni malloc() e free(). L'attivazione del segnale SIGALRM, che interrompe l'esecuzione di un determinato codice in sshd, pu\u00f2 portare a una violazione dello stato di esecuzione, e l'obiettivo dell'exploit \u00e8 creare condizioni per interrompere il codice necessario al momento opportuno. La vulnerabilit\u00e0 non influisce su OpenBSD, poich\u00e9 in esso, invece di syslog(), dal gestore del segnale SIGALRM viene chiamata la funzione syslog_r(), appositamente creata per esecuzioni asincrone.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61470\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Qualys \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-6387) \u0432 OpenSSH, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f regreSSHion, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 OpenSSH 8.5 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u043e\u0439 Glibc. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 Glibc \u0441 \u0432\u043a\u043b\u044e\u0447\u0451\u043d\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 ASLR (\u0440\u0430\u043d\u0434\u043e\u043c\u0438\u0437\u0430\u0446\u0438\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-116883","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Qualys \u0432\u044b\u044f\u0432\u0438\u043b\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-6387) \u0432 OpenSSH, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0443\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f regreSSHion, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 OpenSSH 8.5 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u043e\u0439 Glibc. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 Glibc \u0441 \u0432\u043a\u043b\u044e\u0447\u0451\u043d\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 ASLR (\u0440\u0430\u043d\u0434\u043e\u043c\u0438\u0437\u0430\u0446\u0438\u044f\" \/>\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\/it\/blog\/novosti-interneta\/uyazvimost-v-openssh-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root-na-serverah-s-glibc\" \/>\n\t<meta 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\u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f regreSSHion, \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 OpenSSH 8.5 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u043e\u0439 Glibc. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 Glibc 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La vulnerabilit\u00e0, soprannominata regreSSHion, si manifesta nella configurazione predefinita a partire dalla versione OpenSSH 8.5 su sistemi con la libreria standard Glibc. \u00c8 stata dimostrata la possibilit\u00e0 di attacco su un sistema a 32 bit con Glibc con la protezione ASLR (randomizzazione) abilitata.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-openssh-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root-na-serverah-s-glibc","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 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