{"id":35281,"date":"2019-10-31T22:03:25","date_gmt":"2019-10-31T19:03:25","guid":{"rendered":"https:\/\/prohoster.info\/blog\/massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim\/"},"modified":"2019-10-31T22:03:25","modified_gmt":"2019-10-31T19:03:25","slug":"massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/massovaya-ataka-na-uyazvimye-pochtovye-servery-na-osnove-exim","title":{"rendered":"Attacco massiccio ai server di posta vulnerabili basati su Exim","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I ricercatori della sicurezza di Cybereason hanno avvertito<\/a><\/noindex> hanno avvertito gli amministratori dei server di posta riguardo a un attacco automatizzato di massa che sfrutta una vulnerabilit\u00e0 critica<\/a><\/noindex> (CVE-2019-10149) in Exim, scoperta la settimana scorsa. Durante l'attacco, gli aggressori riescono a eseguire il loro codice con privilegi di root e installano sul server malware per il mining di criptovalute.<\/p>\n

Secondo i dati di giugno, su circa un milione di server di posta, Postfix \u00e8 utilizzato nel 34,29% (34,42%) dei server di posta,<\/a><\/noindex> la quota di Exim \u00e8 del 57,05% (un anno fa 56,56%), Postfix \u00e8 utilizzo al 34,52% (33,79%) nei server di posta, Sendmail \u2014 4,05% (4,59%), Microsoft Exchange \u2014 0,57% (0,85%). i dati<\/a><\/noindex> Secondo il servizio Shodan, sono ancora oltre 3,6 milioni i server di posta potenzialmente vulnerabili in rete, che non sono stati aggiornati all'ultima versione disponibile di Exim 4.92. Circa 2 milioni dei server potenzialmente vulnerabili si trovano negli Stati Uniti, 192 mila in Russia. informazioni<\/a><\/noindex> Secondo l'azienda RiskIQ, il 70% dei server con Exim ha gi\u00e0 effettuato l'aggiornamento alla versione 4.92.<\/p>\n

\"Attacco<\/center><\/p>\n

Agli amministratori si consiglia di installare urgentemente gli aggiornamenti, che erano stati resi disponibili la scorsa settimana dalle distribuzioni (Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, openSUSE<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Fedora<\/a><\/noindex>, EPEL per RHEL\/CentOS<\/a><\/noindex>). In caso di presenza nella sistema di una vulnerabilit\u00e0 nota della versione Exim (dalla 4.87 alla 4.91 inclusa), \u00e8 necessario verificare che il sistema non sia gi\u00e0 compromesso, controllando il crontab per eventuali chiamate sospette e assicurandosi dell'assenza di chiavi aggiuntive nella directory \/root\/.ssh. Un attacco pu\u00f2 anche essere indicato dalla presenza di attivit\u00e0 nel log del firewall da host come an7kmd2wp4xo7hpr.tor2web.su, an7kmd2wp4xo7hpr.tor2web.io e an7kmd2wp4xo7hpr.onion.sh, utilizzati per il download di malware. <\/p>\n

Le prime tentativi di attacco ai server Exim sono stati registrati<\/a><\/noindex> il 9 giugno. Entro il 13 giugno, l'attacco ha assunto<\/a><\/noindex> ha assunto una<\/a><\/noindex> natura massiccia. Dopo l'esploitazione della vulnerabilit\u00e0 attraverso i gateway tor2web del servizio Tor (an7kmd2wp4xo7hpr), viene caricato uno script che verifica la presenza di OpenSSH (se non presente lo installa<\/a><\/noindex>), modifica le sue impostazioni (permette<\/a><\/noindex> accesso come root e autenticazione tramite chiavi) e stabilisce per l'utente root una chiave RSA<\/a><\/noindex>, fornendo accesso privilegiato al sistema tramite SSH.<\/p>\n

Dopo aver impostato il backdoor, viene installato un scanner di porte per identificare altri server vulnerabili. Viene anche effettuata una ricerca nel sistema per eventuali mining gi\u00e0 presenti, che vengono rimossi in caso di scoperta. Nell'ultima fase, viene caricato e registrato nel crontab il proprio miner. Il miner viene caricato sotto forma di file ico (che in realt\u00e0 \u00e8 un archivio zip con password \u00abno-password\u00bb), contenente un file eseguibile in formato ELF per Linux con Glibc 2.7+.<\/p>\n

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

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

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