{"id":81560,"date":"2020-05-14T19:42:19","date_gmt":"2020-05-14T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd"},"modified":"2020-05-14T19:42:19","modified_gmt":"2020-05-14T17:42:19","slug":"udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"Vulnerabilit\u00e0 sfruttabili da remoto in FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>In FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/thread.html\">sono state corrette<\/a><\/noindex> Cinque vulnerabilit\u00e0, tra cui ci sono problemi che possono potenzialmente portare a sovrascritture di dati a livello di kernel durante l'invio di specifici pacchetti di rete o consentire a un utente locale di elevare i propri privilegi. Le vulnerabilit\u00e0 sono state corrette negli aggiornamenti 12.1-RELEASE-p5 e 11.3-RELEASE-p9. <\/p>\n<p>La vulnerabilit\u00e0 pi\u00f9 pericolosa (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) \u00e8 causata dalla mancanza di un'adeguata verifica della dimensione del pacchetto nella libreria libalias durante l'analisi degli header specifici dei protocolli. La libreria libalias \u00e8 utilizzata nel filtro pacchetti ipfw per la traduzione degli indirizzi e include funzioni standard per la sostituzione degli indirizzi nei pacchetti IP e l'analisi dei protocolli. La vulnerabilit\u00e0 consente, tramite l'invio di un pacchetto di rete appositamente formattato, di ottenere la lettura o la scrittura di dati nelle aree di memoria del kernel (nel caso venga utilizzata l'implementazione NAT nel kernel) o del processo<br \/>\nnatd (in caso di utilizzo di un'implementazione NAT nello spazio utente). Il problema non influisce sulle configurazioni NAT costruite utilizzando filtri pacchetti pf e ipf, cos\u00ec come sulle configurazioni ipfw in cui il NAT non \u00e8 utilizzato. <\/p>\n<p>Altre vulnerabilit\u00e0:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001951.html\">CVE-2020-7455<\/a><\/noindex> \u2014 un'altra vulnerabilit\u00e0 sfruttabile da remoto in libalias, legata a un calcolo errato della lunghezza dei pacchetti nell'handler FTP. Il problema \u00e8 limitato a una fuoriuscita di contenuti di alcuni byte di dati dall'area di memoria del kernel o del processo natd.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001953.html\">CVE-2019-15879<\/a><\/noindex> \u2014 vulnerabilit\u00e0 nel modulo cryptodev, causata da un accesso a una regione di memoria gi\u00e0 liberata (use-after-free), che consente a un processo non privilegiato di sovrascrivere sezioni arbitrarie della memoria del kernel. Come soluzione per bloccare la vulnerabilit\u00e0, si consiglia di scaricare il modulo cryptodev con il comando \u00abkldunload cryptodev\u00bb, se \u00e8 stato caricato (per impostazione predefinita, cryptodev non \u00e8 caricato). Il modulo cryptodev fornisce alle applicazioni nello spazio utente accesso all'interfaccia \/dev\/crypto per accedere ai meccanismi di accelerazione hardware delle operazioni crittografiche (in AES-NI e OpenSSL \/dev\/crypto non viene utilizzato).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001954.html\">CVE-2019-15880<\/a><\/noindex> \u2014 seconda vulnerabilit\u00e0 in cryptodev, che consente a un utente non privilegiato di innescare un crash del kernel inviando una richiesta per eseguire un'operazione crittografica con un MAC non valido. Il problema \u00e8 causato dalla mancanza di verifica della dimensione della chiave MAC durante l'allocazione di un buffer per la sua memorizzazione (il buffer veniva creato in base ai dati sulla dimensione forniti dall'utente, senza controllare la dimensione reale).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001952.html\">CVE-2019-15878<\/a><\/noindex> \u2014 vulnerabilit\u00e0 nell'implementazione del protocollo SCTP (Stream Control Transmission Protocol), causata da un'errata verifica della chiave condivisa utilizzata dall'estensione SCTP-AUTH per l'autenticazione delle sequenze SCTP. Un'applicazione locale pu\u00f2 aggiornare la chiave tramite l'API Socket, interrompendo contemporaneamente la connessione SCTP, il che porter\u00e0 a un accesso a un'area di memoria gi\u00e0 liberata (use-after-free).\n<\/ul>\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=52948\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u043b\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.1-RELEASE-p5 \u0438 11.3-RELEASE-p9. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7454) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u0434\u043e\u043b\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043a\u0435\u0442\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libalias \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u0434\u043b\u044f [&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-81560","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e.\" \/>\n\t<meta name=\"robots\" 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