{"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\/sk\/blog\/news\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","title":{"rendered":"Kritick\u00e1 0-day zranite\u013enos\u0165 v Spring Framework, pou\u017e\u00edvanom v mnoh\u00fdch Java projektoch","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V module Spring Core, ktor\u00fd je s\u00fa\u010das\u0165ou frameworku Spring Framework, bola identifikovan\u00e1 kritick\u00e1 0-day zranite\u013enos\u0165, ktor\u00e1 umo\u017e\u0148uje neautentifikovan\u00e9mu vzdialen\u00e9mu \u00fato\u010dn\u00edkovi vykona\u0165 svoj k\u00f3d na serveri. Zatia\u013e nie je jasn\u00e9, ak\u00e9 katastrof\u00e1lne m\u00f4\u017eu by\u0165 n\u00e1sledky tejto zisten\u00e9ho probl\u00e9mu a \u010di bud\u00fa \u00fatoky tak isto mas\u00edvne ako v pr\u00edpade zranite\u013enosti v Log4j 2. Zranite\u013enosti bolo pridelen\u00e9 k\u00f3dov\u00e9 meno Spring4Shell, ale CVE identifik\u00e1tor zatia\u013e nebol priraden\u00fd. Probl\u00e9m v Spring Framework zost\u00e1va neopravovan\u00fd a na internete je u\u017e k dispoz\u00edcii nieko\u013eko funk\u010dn\u00fdch prototypov exploitov (1, 2, 3, 4). Probl\u00e9m je zosilnen\u00fd t\u00fdm, \u017ee mnoh\u00e9 firemn\u00e9 Java aplik\u00e1cie zalo\u017een\u00e9 na Spring Framework be\u017eia s pr\u00e1vami root a zranite\u013enos\u0165 umo\u017e\u0148uje \u00faplne skompromitova\u0165 syst\u00e9m. <\/p>\n

Pod\u013ea niektor\u00fdch odhadov sa modul Spring Core pou\u017e\u00edva v 74 % Java aplik\u00e1ci\u00ed. Nebezpe\u010denstvo zranite\u013enosti zmier\u0148uje to, \u017ee \u00fatokom s\u00fa vystaven\u00e9 iba aplik\u00e1cie, ktor\u00e9 pou\u017e\u00edvaj\u00fa anot\u00e1ciu @RequestMapping pri prid\u00e1van\u00ed spracovate\u013eov po\u017eiadaviek a viazan\u00ed parametrov webov\u00fdch formul\u00e1rov vo form\u00e1te name=value (POJO, Plain Old Java Object), namiesto pou\u017e\u00edvania JSON\/XML. <\/p>\n

Ktor\u00e9 konkr\u00e9tne Java aplik\u00e1cie a r\u00e1mce s\u00fa vystaven\u00e9 probl\u00e9mu, zatia\u013e nie je jasn\u00e9. Zranite\u013enos\u0165 blokuje prid\u00e1vanie do \u010dierneho zoznamu pol\u00ed class, module a classLoader alebo pou\u017e\u00edvanie explicitn\u00e9ho bieleho zoznamu povolen\u00fdch pol\u00ed. Vyu\u017eitie zranite\u013enosti je mo\u017en\u00e9 len pri pou\u017eit\u00ed Java\/JDK 9 alebo nov\u0161ej verzie. Probl\u00e9m je sp\u00f4soben\u00fd mo\u017enos\u0165ou obch\u00e1dzania ochrany proti zranite\u013enosti CVE-2010-1622, ktor\u00e1 bola opraven\u00e1 v Spring Frameworku u\u017e v roku 2010 a s\u00favis\u00ed so sp\u00fa\u0161\u0165an\u00edm spracovate\u013ea classLoader pri anal\u00fdze parametrov po\u017eiadavky. <\/p>\n

Funkcia exploit sa zni\u017euje na odosielanie po\u017eiadavky s parametrami class.module.classLoader.resources.context.parent.pipeline.first.*, ktor\u00fdch spracovanie vedie k vytvoreniu jsp s\u00faboru v kore\u0148ovom prostred\u00ed Apache Tomcat a zap\u00edsaniu do tohto s\u00faboru ur\u010den\u00e9ho \u00fato\u010dn\u00edkom k\u00f3du. Vytvoren\u00fd s\u00fabor sa st\u00e1va dostupn\u00fdm na priame po\u017eiadavky a m\u00f4\u017ee by\u0165 pou\u017eit\u00fd ako webov\u00fd shell. Na \u00fatok na zranite\u013en\u00fa aplik\u00e1ciu v prostred\u00ed Apache Tomcat sta\u010d\u00ed odosla\u0165 po\u017eiadavku s ur\u010dit\u00fdmi parametrami pomocou n\u00e1stroja curl. curl -v -d \"class.module.classLoader.resources.context.parent.pipeline.first.pattern=k\u00f3d_na_vlo\u017eenie_do_s\u00faboru & 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-exmaple-0.0.1-SNAPSHOT\/rapid7 <\/p>\n

Rie\u0161en\u00fa problematiku v Spring Core netreba zamie\u0148a\u0165 s ned\u00e1vno zisten\u00fdmi zranite\u013enos\u0165ami CVE-2022-22963 a CVE-2022-22950. Prv\u00e1 zranite\u013enos\u0165 sa t\u00fdka bal\u00edka Spring Cloud a bola odstr\u00e1nen\u00e1 vo vydaniach 3.1.7 a 3.2.3. Druh\u00e1 zranite\u013enos\u0165 je pr\u00edtomn\u00e1 v Spring Expression a bola opraven\u00e1 vo Spring Framework 5.3.17. Ide o z\u00e1sadne odli\u0161n\u00e9 zranite\u013enosti. V\u00fdvoj\u00e1ri Spring Framework zatia\u013e neurobili \u017eiadne vyhl\u00e1senia o novej zranite\u013enosti a nezverejnili opravy. <\/p>\n

Ako do\u010dasn\u00e9 opatrenie na ochranu sa odpor\u00fa\u010da pou\u017e\u00edva\u0165 v k\u00f3de \u010dierny zoznam neprijate\u013en\u00fdch parametrov po\u017eiadavky: 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 zranite\u013enos\u0165 v Spring Framework, pou\u017e\u00edvanom v mnoh\u00fdch Java projektoch | ProHoster","description":"V module Spring Core dod\u00e1vanom ako s\u00fa\u010das\u0165 frameworku Spring Framework bola zisten\u00e1 kritick\u00e1 0-day zranite\u013enos\u0165, ktor\u00e1 umo\u017e\u0148uje neautentifikovan\u00e9mu vzdialen\u00e9mu \u00fato\u010dn\u00edkovi 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