{"id":73151,"date":"2020-03-07T14:42:03","date_gmt":"2020-03-07T11:42:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root"},"modified":"2020-03-07T14:42:03","modified_gmt":"2020-03-07T11:42:03","slug":"uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"Vulnerabilit\u00e0 in pppd e lwIP che consente l'esecuzione remota di codice con privilegi di root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel pacchetto pppd \u00e8 stata rilevata<\/a><\/noindex> una vulnerabilit\u00e0<\/a><\/noindex> (CVE-2020-8597<\/a><\/noindex>), che consente di eseguire il proprio codice inviando richieste di autenticazione appositamente formattate ai sistemi che utilizzano il protocollo PPP (Point-to-Point Protocol) o PPPoE (PPP over Ethernet). Questi protocolli sono comunemente utilizzati dai provider per gestire le connessioni tramite Ethernet o DSL, e sono anche utilizzati in alcune VPN (ad esempio, pptpd e openfortivpn<\/a><\/noindex>). Per verificare la vulnerabilit\u00e0 dei propri sistemi \u00e8 stato preparato<\/a><\/noindex> prototipo dell'exploit.<\/p>\n

La vulnerabilit\u00e0 \u00e8 causata da un buffer overflow nell'implementazione del protocollo di autenticazione EAP (Extensible Authentication Protocol). L'attacco pu\u00f2 essere effettuato prima dell'autenticazione inviando un pacchetto di tipo EAPT_MD5CHAP, contenente un nome host molto lungo, che non rientra nel buffer allocato. A causa di un errore nel codice di controllo della dimensione del campo rhostname, l'attaccante pu\u00f2 sovrascrivere i dati oltre il buffer nello stack e ottenere l'esecuzione remota del proprio codice con privilegi di root. La vulnerabilit\u00e0 si manifesta sia dal lato server che dal lato client, ovvero pu\u00f2 essere attaccato non solo il server, ma anche il client che cerca di connettersi a un server controllato dall'attaccante (ad esempio, l'attaccante pu\u00f2 prima compromettere un server tramite la vulnerabilit\u00e0 e poi iniziare a colpire i clienti che si connettono).<\/p>\n

Il problema riguarda le versioni pppd<\/a><\/noindex> dalla 2.4.2 alla 2.4.8 inclusa ed \u00e8 stato risolto nella forma patch<\/a><\/noindex>. La vulnerabilit\u00e0 si presenta anche in la<\/a><\/noindex> lo stack lwIP<\/a><\/noindex>, ma nella configurazione predefinita in lwIP, il supporto per EAP non \u00e8 abilitato.<\/p>\n

Lo stato della risoluzione del problema nelle distribuzioni pu\u00f2 essere visualizzato a queste pagine: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Arch<\/a><\/noindex>, NetBSD<\/a><\/noindex>. In RHEL, OpenWRT e SUSE il pacchetto pppd \u00e8 stato compilato con protezione 'Stack Smashing Protection' (modalit\u00e0 '-fstack-protector' in gcc), il che limita l'exploitation di crash. Oltre alle distribuzioni, la vulnerabilit\u00e0 \u00e8 stata confermata anche in alcuni prodotti Cisco<\/a><\/noindex> (CallManager), TP-LINK<\/a><\/noindex> e Synology (DiskStation Manager, VisualStation VS960HD e Router Manager), che utilizzano il codice pppd o lwIP.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 pppd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-8597), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043d\u0430 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b PPP (Point-to-Point Protocol) \u0438\u043b\u0438 PPPoE (PPP over Ethernet). \u0414\u0430\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043e\u0431\u044b\u0447\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0447\u0435\u0440\u0435\u0437 Ethernet \u0438\u043b\u0438 DSL, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 VPN (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, pptpd \u0438 openfortivpn). \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0441\u0432\u043e\u0438\u0445 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