{"id":102661,"date":"2021-12-19T03:36:43","date_gmt":"2021-12-19T01:36:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/eshhyo-odna-uyazvimost-v-log4j-2-problemy-v-log4j-zatragivayut-8-maven-paketov"},"modified":"2021-12-19T03:36:43","modified_gmt":"2021-12-19T01:36:45","slug":"eshhyo-odna-uyazvimost-v-log4j-2-problemy-v-log4j-zatragivayut-8-maven-paketov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/eshhyo-odna-uyazvimost-v-log4j-2-problemy-v-log4j-zatragivayut-8-maven-paketov","title":{"rendered":"Egy \u00fajabb sebezhet\u0151s\u00e9g a Log4j 2-ben. A Log4j probl\u00e9m\u00e1i a Maven-csomagok 8%-\u00e1t \u00e9rintik.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Log4j 2 k\u00f6nyvt\u00e1rban egy \u00fajabb sebezhet\u0151s\u00e9g (CVE-2021-45105) ker\u00fclt el\u0151, amely a k\u00e9t kor\u00e1bbi probl\u00e9m\u00e1t\u00f3l elt\u00e9r\u0151en vesz\u00e9lyesnek, de nem kritikusnak min\u0151s\u00fcl. Az \u00faj probl\u00e9ma szolg\u00e1ltat\u00e1smegszak\u00edt\u00e1st id\u00e9zhet el\u0151, \u00e9s ciklikus hibak\u00e9nt jelentkezik bizonyos karakterl\u00e1ncok feldolgoz\u00e1sa sor\u00e1n. A sebezhet\u0151s\u00e9g a nemr\u00e9giben k\u00f6zz\u00e9tett Log4j 2.17 kiad\u00e1sban lett jav\u00edtva. A sebezhet\u0151s\u00e9g vesz\u00e9ly\u00e9t cs\u00f6kkenti, hogy a probl\u00e9ma csak a Java 8-zal rendelkez\u0151 rendszereken l\u00e9p fel. <\/p>\n

A sebezhet\u0151s\u00e9gek azok a rendszerek, amelyek a napl\u00f3z\u00e1si kimeneti form\u00e1tum meghat\u00e1roz\u00e1sakor kontextus alap\u00fa lek\u00e9rdez\u00e9seket (Context Lookup) haszn\u00e1lnak, mint p\u00e9ld\u00e1ul ${ctx:var}. A Log4j 2.0-alpha1 \u00e9s 2.16.0 k\u00f6z\u00f6tti verzi\u00f3iban hi\u00e1nyzott a v\u00e9delm\u00e9t a kontroll\u00e1latlan rekurzi\u00f3val szemben, ami lehet\u0151v\u00e9 tette a t\u00e1mad\u00f3k sz\u00e1m\u00e1ra, hogy a behelyettes\u00edt\u00e9shez haszn\u00e1lt \u00e9rt\u00e9k manipul\u00e1l\u00e1s\u00e1val ciklust id\u00e9zzenek el\u0151, amely a veremhely kimer\u00fcl\u00e9s\u00e9hez \u00e9s a folyamat \u00f6sszeoml\u00e1s\u00e1hoz vezetett. K\u00fcl\u00f6n\u00f6sen a probl\u00e9ma akkor jelentkezett, amikor olyan \u00e9rt\u00e9kek, mint a «${${::-${::-$${::-j}}}}» voltak behelyettes\u00edtve. <\/p>\n

Ezenk\u00edv\u00fcl \u00e9rdemes megeml\u00edteni, hogy a Blumira c\u00e9g kutat\u00f3i t\u00e1mad\u00e1si m\u00f3dot javasoltak sebezhet\u0151 Java-alkalmaz\u00e1sok ellen, amelyek nem fogadnak k\u00fcls\u0151 h\u00e1l\u00f3zati k\u00e9r\u00e9seket; p\u00e9ld\u00e1ul \u00edgy lehet t\u00e1madni a fejleszt\u0151k vagy Java-alkalmaz\u00e1sok felhaszn\u00e1l\u00f3inak rendszereit. A m\u00f3dszer l\u00e9nyege, hogy ha a felhaszn\u00e1l\u00f3 rendszer\u00e9n olyan sebezhet\u0151 Java-folyamatok futnak, amelyek csak helyi hosztb\u00f3l (localhost) fogadnak h\u00e1l\u00f3zati kapcsolatokat, vagy RMI-k\u00e9r\u00e9seket (Remote Method Invocation, 1099 port) kezelnek, a t\u00e1mad\u00e1s JavaScript-k\u00f3ddal val\u00f3s\u00edthat\u00f3 meg, amelyet \u00e1rtalmas weboldal megnyit\u00e1sakor futtatnak a felhaszn\u00e1l\u00f3 b\u00f6ng\u00e9sz\u0151j\u00e9ben. Ehhez a Java-alkalmaz\u00e1s h\u00e1l\u00f3zati portj\u00e1hoz val\u00f3 kapcsol\u00f3d\u00e1shoz WebSocket API-t haszn\u00e1lnak, amelyre a HTTP-k\u00e9r\u00e9sekkel szemben nincsenek same-origin korl\u00e1toz\u00e1sok (a WebSocket h\u00e1l\u00f3zati portok helyi hoszton t\u00f6rt\u00e9n\u0151 beolvas\u00e1s\u00e1ra is haszn\u00e1lhat\u00f3 a megl\u00e9v\u0151 h\u00e1l\u00f3zati kezel\u0151k azonos\u00edt\u00e1sa \u00e9rdek\u00e9ben).

\"Egy<\/center> <\/p>\n

Szint\u00e9n figyelemre m\u00e9lt\u00f3 a Google \u00e1ltal k\u00f6zz\u00e9tett sebezhet\u0151s\u00e9gi \u00e9rt\u00e9kel\u00e9s eredm\u00e9nyei a Log4j-hoz kapcsol\u00f3d\u00f3 k\u00f6nyvt\u00e1rakban l\u00e9v\u0151 f\u00fcgg\u0151s\u00e9gekkel kapcsolatban. A Google adatai szerint a probl\u00e9ma a Maven Central t\u00e1rol\u00f3 \u00f6sszes csomagj\u00e1nak 8%-\u00e1t \u00e9rinti. K\u00fcl\u00f6n\u00f6sen 35863 Java-csomag volt sebezhet\u0151 a Log4j k\u00f6zvetlen \u00e9s k\u00f6zvetett f\u00fcgg\u0151s\u00e9gei r\u00e9v\u00e9n. A Log4j-t csup\u00e1n a k\u00f6zvetlen els\u0151 szint\u0171 f\u00fcgg\u0151s\u00e9gk\u00e9nt 17%-ban haszn\u00e1lt\u00e1k, m\u00edg a sebezhet\u0151s\u00e9ggel \u00e9rintett csomagok 83%-a k\u00f6zvetett csomagok r\u00e9v\u00e9n kapcsol\u00f3dott a Log4j-hoz, azaz m\u00e1sod- \u00e9s ann\u00e1l magasabb szint\u0171 f\u00fcgg\u0151s\u00e9geken kereszt\u00fcl (21% -- m\u00e1sodik szint, 12% -- harmadik, 14% -- negyedik, 26% -- \u00f6t\u00f6dik, 6% -- hatodik). A sebezhet\u0151s\u00e9g jav\u00edt\u00e1s\u00e1nak \u00fcteme eddig nem kiel\u00e9g\u00edt\u0151, egy h\u00e9ttel a probl\u00e9ma felfedez\u00e9se ut\u00e1n a 35863 azonos\u00edtott csomagb\u00f3l csak 4620-ban sz\u00fcntett\u00e9k meg a probl\u00e9m\u00e1t, ami mind\u00f6ssze 13%-ot jelent.

\"Egy<\/center> <\/p>\n

K\u00f6zben az Egyes\u00fclt \u00c1llamok Kiberbiztons\u00e1gi \u00e9s Infrastrukt\u00fara Biztons\u00e1gi \u00dcgyn\u00f6ks\u00e9ge s\u00fcrg\u0151ss\u00e9gi ir\u00e1nyelvet tett k\u00f6zz\u00e9, amely k\u00f6telezi a sz\u00f6vets\u00e9gi \u00fcgyn\u00f6ks\u00e9geket, hogy azonos\u00edts\u00e1k az Log4j sebezhet\u0151s\u00e9g\u00e9nek kitett inform\u00e1ci\u00f3s rendszereket, \u00e9s december 23-ig telep\u00edtsenek friss\u00edt\u00e9seket, amelyek blokkolj\u00e1k a probl\u00e9m\u00e1t. December 28-ig az int\u00e9zm\u00e9nyeknek jelent\u00e9st kell tenni\u00fck az elv\u00e9gzett munk\u00e1r\u00f3l. A probl\u00e9m\u00e1s rendszerek egyszer\u0171bb azonos\u00edt\u00e1sa \u00e9rdek\u00e9ben kidolgoztak egy term\u00e9kl list\u00e1t, amelyben meger\u0151s\u00edtett\u00e9k a sebezhet\u0151s\u00e9g megjelen\u00e9s\u00e9t (a list\u00e1n t\u00f6bb mint 23 ezer alkalmaz\u00e1s szerepel).
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 Log4j 2 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-45105), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0432 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u0434\u0432\u0443\u0445 \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c, \u043e\u0442\u043d\u0435\u0441\u0435\u043d\u0430 \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u043e\u043f\u0430\u0441\u043d\u044b\u0445, \u043d\u043e \u043d\u0435 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445. \u041d\u043e\u0432\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0438 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0432\u0438\u0434\u0435 \u0437\u0430\u0446\u0438\u043a\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u0438 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0442\u0440\u043e\u043a. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0447\u0430\u0441\u043e\u0432 \u043d\u0430\u0437\u0430\u0434 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 Log4j 2.17. \u041e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0441\u0433\u043b\u0430\u0436\u0438\u0432\u0430\u0435\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102662,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102661","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47M\u00e9g egy sebezhet\u0151s\u00e9g a Log4j 2-ben. 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\u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Log4j 2. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 Log4j \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0442 8% Maven-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 | ProHoster","og:description":"\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 Log4j 2 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-45105), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0432 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u0434\u0432\u0443\u0445 \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c, \u043e\u0442\u043d\u0435\u0441\u0435\u043d\u0430 \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u043e\u043f\u0430\u0441\u043d\u044b\u0445, \u043d\u043e \u043d\u0435 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