{"id":103660,"date":"2022-03-31T09:36:38","date_gmt":"2022-03-31T07:36:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah"},"modified":"2022-03-31T09:36:38","modified_gmt":"2022-03-31T07:36:38","slug":"kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","title":{"rendered":"Kritick\u00e1 0-day zranitelnost ve Spring Frameworku, pou\u017e\u00edvan\u00e9m v mnoha Java projektech.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V modulu Spring Core, dod\u00e1van\u00e9m jako sou\u010d\u00e1st r\u00e1mce Spring Framework, byla odhalena kritick\u00e1 0-day zranitelnost, kter\u00e1 umo\u017e\u0148uje neautentizovan\u00e9mu vzd\u00e1len\u00e9mu \u00fato\u010dn\u00edkovi spustit vlastn\u00ed k\u00f3d na serveru. Zat\u00edm nen\u00ed jasn\u00e9, jak katastrof\u00e1ln\u00ed n\u00e1sledky m\u016f\u017ee m\u00edt odhalen\u00fd probl\u00e9m a zda budou \u00fatoky stejn\u011b masivn\u00ed jako v p\u0159\u00edpad\u011b zranitelnosti v Log4j 2. Zranitelnosti bylo p\u0159id\u011bleno k\u00f3dov\u00e9 jm\u00e9no Spring4Shell, ale CVE identifik\u00e1tor dosud nebyl p\u0159id\u011blen. V Spring Framework z\u016fst\u00e1v\u00e1 probl\u00e9m neopraven\u00fd a na internetu jsou ji\u017e k dispozici n\u011bkter\u00e9 funk\u010dn\u00ed prototypy exploit\u016f (1, 2, 3, 4). Probl\u00e9m zhor\u0161uje fakt, \u017ee mnoh\u00e9 podnikov\u00e9 Java aplikace b\u011b\u017e\u00edc\u00ed na z\u00e1klad\u011b Spring Framework maj\u00ed pr\u00e1va root a zranitelnost umo\u017e\u0148uje pln\u011b kompromitovat syst\u00e9m. <\/p>\n

Podle n\u011bkter\u00fdch odhad\u016f se modul Spring Core pou\u017e\u00edv\u00e1 ve 74 % Java aplikac\u00ed. Riziko zranitelnosti sni\u017euje to, \u017ee jsou ohro\u017eeny pouze aplikace, kter\u00e9 pou\u017e\u00edvaj\u00ed anotaci @RequestMapping p\u0159i p\u0159ipojen\u00ed zpracovatel\u016f po\u017eadavk\u016f a vazbu parametr\u016f webov\u00fdch formul\u00e1\u0159\u016f ve form\u00e1tu name=value (POJO, Plain Old Java Object), m\u00edsto pou\u017eit\u00ed JSON\/XML. <\/p>\n

Jak\u00e9 konkr\u00e9tn\u00ed Java aplikace a frameworky jsou probl\u00e9mem, zat\u00edm nen\u00ed jasn\u00e9. Zranitelnost znemo\u017e\u0148uje p\u0159id\u00e1n\u00ed do \u010dern\u00e9 listiny pol\u00ed class, module a classLoader nebo pou\u017eit\u00ed jasn\u00e9ho b\u00edl\u00e9ho seznamu povolen\u00fdch pol\u00ed. Vyu\u017eit\u00ed zranitelnosti je mo\u017en\u00e9 pouze p\u0159i pou\u017eit\u00ed Java\/JDK 9 nebo nov\u011bj\u0161\u00ed verze. Probl\u00e9m je zp\u016fsoben mo\u017enost\u00ed obch\u00e1zen\u00ed ochrany p\u0159ed zranitelnost\u00ed CVE-2010-1622, kter\u00e1 byla opravena ve Spring Framework je\u0161t\u011b v roce 2010 a souvis\u00ed s prov\u00e1d\u011bn\u00edm zpracovatele classLoader p\u0159i anal\u00fdze parametr\u016f po\u017eadavku. <\/p>\n

Funkce exploitu spo\u010d\u00edv\u00e1 v odes\u00edl\u00e1n\u00ed po\u017eadavku s parametry class.module.classLoader.resources.context.parent.pipeline.first.*, jejich\u017e zpracov\u00e1n\u00ed vede ke vytvo\u0159en\u00ed jsp souboru v ko\u0159enov\u00e9m prost\u0159ed\u00ed Apache Tomcat a z\u00e1pisu do tohoto souboru k\u00f3du zadan\u00e9ho \u00fato\u010dn\u00edkem. Vytvo\u0159en\u00fd soubor se st\u00e1v\u00e1 p\u0159\u00edstupn\u00fdm pro p\u0159\u00edm\u00e9 po\u017eadavky a m\u016f\u017ee b\u00fdt pou\u017eit jako web shell. K \u00fatoku na zranitelnou aplikaci v prost\u0159ed\u00ed Apache Tomcat sta\u010d\u00ed odeslat po\u017eadavek s ur\u010dit\u00fdmi parametry pomoc\u00ed n\u00e1stroje curl. curl -v -d 'class.module.classLoader.resources.context.parent.pipeline.first.pattern=k\u00f3d_pro_vlo\u017een\u00ed_do_souboru & class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp & class.module.classLoader.resources.context.parent.pipeline.first.directory=webapps\/ROOT & class.module.classLoader.resources.context.parent.pipeline.first.prefix=tomcatwar & class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=' http:\/\/localhost:8080\/springmvc5-helloworld-example-0.0.1-SNAPSHOT\/rapid7 <\/p>\n

Probl\u00e9m, kter\u00fd zva\u017eujeme ve Spring Core, nelze zam\u011b\u0148ovat s ned\u00e1vno zji\u0161t\u011bn\u00fdmi zranitelnostmi CVE-2022-22963 a CVE-2022-22950. Prvn\u00ed probl\u00e9m se dot\u00fdk\u00e1 bal\u00ed\u010dku Spring Cloud a byl vy\u0159e\u0161en v verz\u00edch 3.1.7 a 3.2.3. Druh\u00e1 zranitelnost existuje v Spring Expression a byla opravena ve Spring Framework 5.3.17. Tyto zranitelnosti jsou principi\u00e1ln\u011b odli\u0161n\u00e9. K v\u00fd\u0161e uveden\u00e9 zranitelnosti dosud v\u00fdvoj\u00e1\u0159i Spring Framework neu\u010dinili \u017e\u00e1dn\u00e9 prohl\u00e1\u0161en\u00ed a nezve\u0159ejnili opravu. <\/p>\n

Jako do\u010dasn\u00e9 opat\u0159en\u00ed k ochran\u011b se doporu\u010duje pou\u017e\u00edt v k\u00f3du \u010dernou listinu nep\u0159ijateln\u00fdch parametr\u016f po\u017eadavku: import org.springframework.core.Ordered; import org.springframework.core.annotation.Order; import org.springframework.web.bind.WebDataBinder; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.InitBinder; @ControllerAdvice @Order(10000) public class BinderControllerAdvice { @InitBinder public void setAllowedFields(WebDataBinder dataBinder) { String[] denylist = new String[]{'class.', 'Class.', '.class.', '.Class.'}; dataBinder.setDisallowedFields(denylist); } }
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043c\u043e\u0434\u0443\u043b\u0435 Spring Core, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430 Spring Framework, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f 0-day \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435. \u041f\u043e\u043a\u0430 \u043d\u0435 \u044f\u0441\u043d\u043e \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u0430\u0442\u0430\u0441\u0442\u0440\u043e\u0444\u0438\u0447\u043d\u044b \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0438 \u0431\u0443\u0434\u0443\u0442 \u0430\u0442\u0430\u043a\u0438 \u0441\u0442\u043e\u043b\u044c \u0436\u0435 \u043c\u0430\u0441\u0441\u043e\u0432\u044b\u043c\u0438, \u043a\u0430\u043a \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c\u044e \u0432 Log4j 2. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d\u043e \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Spring4Shell, \u043d\u043e CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043f\u043e\u043a\u0430 […]<\/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-103660","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\udd47Kritick\u00e1 0-day zranitelnost ve Spring Framework, pou\u017e\u00edvan\u00e9m v mnoha Java projektech | ProHoster","description":"V modulu Spring Core dod\u00e1van\u00e9m v r\u00e1mci frameworku Spring Framework byla zji\u0161t\u011bna kritick\u00e1 0-day zranitelnost, kter\u00e1 umo\u017e\u0148uje neautentizovan\u00e9mu vzd\u00e1len\u00e9mu \u00fato\u010dn\u00edkovi spustit sv\u016fj k\u00f3d na serveru.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f 0-day \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Spring Framework, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 Java-\u043f\u0440\u043e\u0435\u043a\u0442\u0430\u0445 | ProHoster","og:description":"\u0412 \u043c\u043e\u0434\u0443\u043b\u0435 Spring Core, \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430 Spring Framework, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f 0-day \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2022-03-31T07:36:38+00:00","article:modified_time":"2022-03-31T07:36:38+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"103660","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2022-03-31 07:37:59","updated":"2022-09-27 15:24:59","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/103660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=103660"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/103660\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=103660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=103660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=103660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}