{"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\/hu\/blog\/news\/kriticheskaya-0-day-uyazvimost-v-spring-framework-primenyaemom-vo-mnogih-java-proektah","title":{"rendered":"Critical 0-day vulnerability in Spring Framework, used in many Java projects","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Spring Core modulban, amely a Spring Framework keretrendszer r\u00e9szek\u00e9nt \u00e9rkezik, kritikus 0-napos sebezhet\u0151s\u00e9get fedeztek fel, amely lehet\u0151v\u00e9 teszi, hogy az azonos\u00edtatlan t\u00e1voli t\u00e1mad\u00f3 k\u00f3dot futtasson a szerveren. M\u00e9g nem vil\u00e1gos, hogy a felfedezett probl\u00e9ma k\u00f6vetkezm\u00e9nyei mennyire s\u00falyosak, \u00e9s hogy a t\u00e1mad\u00e1sok olyan t\u00f6megesen fognak-e terjedni, mint a Log4j 2 sebezhet\u0151s\u00e9ge eset\u00e9ben. A sebezhet\u0151s\u00e9g k\u00f3dneve Spring4Shell, de a CVE-azonos\u00edt\u00f3 m\u00e9g nem lett hozz\u00e1rendelve. A Spring Framework-ben a probl\u00e9ma tov\u00e1bbra is megoldatlan, \u00e9s az interneten m\u00e1r el\u00e9rhet\u0151 n\u00e9h\u00e1ny m\u0171k\u00f6d\u0151 exploit protot\u00edpus (1, 2, 3, 4). A helyzetet s\u00falyosb\u00edtja, hogy sok v\u00e1llalati Java-alkalmaz\u00e1s, amely a Spring Framework-on alapul, root jogosults\u00e1gokkal fut, \u00edgy a sebezhet\u0151s\u00e9g r\u00e9v\u00e9n teljesen kompromitt\u00e1lhat\u00f3 a rendszer. <\/p>\n

A Spring Core modul haszn\u00e1lat\u00e1nak ar\u00e1nya becsl\u00e9sek szerint a Java alkalmaz\u00e1sok 74%-\u00e1ban fordul el\u0151. A sebezhet\u0151s\u00e9g kock\u00e1zat\u00e1t cs\u00f6kkenti, hogy a t\u00e1mad\u00e1snak csak azok az alkalmaz\u00e1sok vannak kit\u00e9ve, amelyek a @RequestMapping annot\u00e1ci\u00f3t haszn\u00e1lj\u00e1k a k\u00e9r\u00e9skezel\u0151k csatlakoztat\u00e1sakor, \u00e9s webform\u00e1k param\u00e9terek\u00e9nt a name=value form\u00e1t alkalmazz\u00e1k (POJO, Plain Old Java Object), a JSON\/XML helyett. <\/p>\n

M\u00e9g nem vil\u00e1gos, hogy pontosan mely Java alkalmaz\u00e1sok \u00e9s keretrendszerek \u00e9rintettek a probl\u00e9m\u00e1ban. A sebezhet\u0151s\u00e9g megakad\u00e1lyozza a class, module \u00e9s classLoader mez\u0151k fekete list\u00e1ra val\u00f3 felv\u00e9tel\u00e9t, vagy a megengedett mez\u0151k explicit feh\u00e9r list\u00e1j\u00e1nak haszn\u00e1lat\u00e1t. A sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1sa csak Java\/JDK 9 vagy \u00fajabb verzi\u00f3 haszn\u00e1lata eset\u00e9n lehets\u00e9ges. A probl\u00e9ma a CVE-2010-1622 sebezhet\u0151s\u00e9g v\u00e9delm\u00e9nek megker\u00fcl\u00e9s\u00e9vel kapcsolatos, amelyet a Spring Framework m\u00e1r 2010-ben jav\u00edtott, \u00e9s a classLoader kezel\u0151 futtat\u00e1s\u00e1hoz kapcsol\u00f3dik a k\u00e9r\u00e9s param\u00e9terei elemz\u00e9sekor. <\/p>\n

A kihaszn\u00e1l\u00f3 m\u0171k\u00f6d\u00e9se egy olyan k\u00e9r\u00e9s k\u00fcld\u00e9s\u00e9re korl\u00e1toz\u00f3dik, amely a class.module.classLoader.resources.context.parent.pipeline.first.* param\u00e9tereket tartalmazza, amelyek feldolgoz\u00e1sa jsp f\u00e1jl l\u00e9trehoz\u00e1s\u00e1hoz vezet az Apache Tomcat gy\u00f6k\u00e9r k\u00f6rnyezet\u00e9ben, \u00e9s az elk\u00f6vet\u0151 \u00e1ltal megadott k\u00f3d r\u00f6gz\u00edt\u00e9s\u00e9hez e f\u00e1jlban. Az \u00edgy l\u00e9trehozott f\u00e1jl k\u00f6zvetlen k\u00e9r\u00e9sk\u00e9ppel \u00e9rhet\u0151 el, \u00e9s web shell-k\u00e9nt haszn\u00e1lhat\u00f3. Az Apache Tomcat k\u00f6rnyezet\u00e9ben l\u00e9v\u0151 sebezhet\u0151 alkalmaz\u00e1s t\u00e1mad\u00e1s\u00e1hoz elegend\u0151 egy adott param\u00e9terekkel rendelkez\u0151 k\u00e9r\u00e9s elk\u00fcld\u00e9se a curl seg\u00e9deszk\u00f6z haszn\u00e1lat\u00e1val. curl -v -d \"class.module.classLoader.resources.context.parent.pipeline.first.pattern=kode_az_f\u00e1jlba_illesztve&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

A vizsg\u00e1lt probl\u00e9m\u00e1t a Spring Core-ban nem szabad \u00f6sszet\u00e9veszteni a napokban felfedezett CVE-2022-22963 \u00e9s CVE-2022-22950 sebezhet\u0151s\u00e9gekkel. Az els\u0151 probl\u00e9ma a Spring Cloud csomagot \u00e9rinti, \u00e9s a 3.1.7 \u00e9s 3.2.3 verzi\u00f3kban megsz\u00fcntett\u00e9k. A m\u00e1sodik probl\u00e9ma a Spring Expression-ben tal\u00e1lhat\u00f3, \u00e9s a Spring Framework 5.3.17 verzi\u00f3ban jav\u00edtott\u00e1k. Ezek alapvet\u0151en m\u00e1s sebezhet\u0151s\u00e9gek. Az \u00faj sebezhet\u0151s\u00e9gr\u0151l a Spring Framework fejleszt\u0151i m\u00e9g nem tettek nyilatkozatot, \u00e9s jav\u00edt\u00e1st sem tettek k\u00f6zz\u00e9. <\/p>\n

\u00c1tmeneti v\u00e9delemk\u00e9nt javasolt, hogy a k\u00f3dban fekete list\u00e1t haszn\u00e1ljunk a nem megengedett k\u00e9r\u00e9sparam\u00e9terekhez: 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
Forr\u00e1s: 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\udd47Kritikus 0-napos sebezhet\u0151s\u00e9g a Spring Framework-ben, amelyet sok Java-projektben alkalmaznak | ProHoster","description":"A Spring Core modulban, amely a Spring Framework r\u00e9szek\u00e9nt \u00e9rkezik, kritikus 0-napos sebezhet\u0151s\u00e9get fedeztek fel, amely lehet\u0151v\u00e9 teszi, hogy a nem hiteles\u00edtett t\u00e1voli t\u00e1mad\u00f3 k\u00f3dot futtasson a 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