{"id":72053,"date":"2020-03-01T08:42:47","date_gmt":"2020-03-01T05:42:47","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-apache-tomcat-pozvolyayushhaya-podstavit-jsp-kod-i-poluchit-fajly-web-prilozhenij"},"modified":"2020-03-03T16:10:21","modified_gmt":"2020-03-03T13:10:21","slug":"uyazvimost-v-apache-tomcat-pozvolyayushhaya-podstavit-jsp-kod-i-poluchit-fajly-web-prilozhenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-apache-tomcat-pozvolyayushhaya-podstavit-jsp-kod-i-poluchit-fajly-web-prilozhenij","title":{"rendered":"Sebezhet\u0151s\u00e9g az Apache Tomcat-ban, amely lehet\u0151v\u00e9 teszi JSP-k\u00f3d behelyettes\u00edt\u00e9s\u00e9t \u00e9s webalkalmaz\u00e1sok f\u00e1jljainak megszerz\u00e9s\u00e9t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A k\u00ednai Chaitin Tech c\u00e9g kutat\u00f3i felfedt\u00e9k vulnerability<\/a><\/noindex> (CVE-2020-1938<\/a><\/noindex>) a Apache Tomcat<\/a><\/noindex>, a Java Servlet, JavaServer Pages, Java Expression Language \u00e9s Java WebSocket technol\u00f3gi\u00e1k ny\u00edlt megval\u00f3s\u00edt\u00e1sa. A sebezhet\u0151s\u00e9g k\u00f3dneve Ghostcat, \u00e9s kritikus vesz\u00e9lyess\u00e9gi szintet kapott (9.8 CVSS). A probl\u00e9ma lehet\u0151v\u00e9 teszi, hogy az alap\u00e9rtelmezett konfigur\u00e1ci\u00f3ban, az 8009-es h\u00e1l\u00f3zati porton kereszt\u00fcl \u00e9rkez\u0151 k\u00e9r\u00e9s k\u00fcld\u00e9s\u00e9vel b\u00e1rmilyen f\u00e1jl tartalm\u00e1t elolvassuk a webalkalmaz\u00e1s k\u00f6nyvt\u00e1r\u00e1b\u00f3l, bele\u00e9rtve a be\u00e1ll\u00edt\u00e1sok f\u00e1jljait \u00e9s az alkalmaz\u00e1s forr\u00e1sk\u00f3dj\u00e1t is.<\/p>\n

A sebezhet\u0151s\u00e9g szint\u00e9n lehet\u0151v\u00e9 teszi m\u00e1s f\u00e1jlok import\u00e1l\u00e1s\u00e1t az alkalmaz\u00e1s k\u00f3dj\u00e1ba, ami lehet\u0151v\u00e9 teszi a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a szerveren, ha az alkalmaz\u00e1s enged\u00e9lyezi a f\u00e1jlok felt\u00f6lt\u00e9s\u00e9t a szerverre (p\u00e9ld\u00e1ul a t\u00e1mad\u00f3 felt\u00f6lthet egy JSP-skriptet k\u00e9pk\u00e9nt a k\u00e9p felt\u00f6lt\u00e9si \u0171rlapon kereszt\u00fcl). A t\u00e1mad\u00e1s akkor val\u00f3s\u00edthat\u00f3 meg, ha lehet\u0151s\u00e9g van k\u00e9r\u00e9s k\u00fcld\u00e9s\u00e9re az AJP kezel\u0151vel rendelkez\u0151 h\u00e1l\u00f3zati portra. Az el\u0151zetes adatok szerint a h\u00e1l\u00f3zatban t\u00f6bb, mint<\/a><\/noindex> t\u00f6bb mint 1.2 milli\u00f3 olyan hoszt tal\u00e1lhat\u00f3, amelyek AJP protokollon fogadnak k\u00e9r\u00e9seket. <\/p>\n

A sebezhet\u0151s\u00e9g az AJP protokollban tal\u00e1lhat\u00f3, \u00e9s nem egy implement\u00e1ci\u00f3s hib\u00e1b\u00f3l ered.<\/a><\/noindex> Az Apache Tomcat eset\u00e9ben az alap\u00e9rtelmez\u00e9s szerint a HTTP (8080-as port) kapcsolatok mellett lehet\u0151v\u00e9 teszi a webalkalmaz\u00e1s el\u00e9r\u00e9s\u00e9t az AJP protokollon kereszt\u00fcl (Apache Jserv Protocol<\/a><\/noindex>, 8009-es port), amely egy optimaliz\u00e1lt, nagyobb teljes\u00edtm\u00e9ny el\u00e9r\u00e9s\u00e9re t\u00f6rekv\u0151 bin\u00e1ris anal\u00f3gja a HTTP-nek, amit \u00e1ltal\u00e1ban Tomcat szerverek klaszter\u00e9nek l\u00e9trehoz\u00e1sakor vagy a Tomcat gyors\u00edt\u00f3t\u00f3l vagy terhel\u00e9seloszt\u00f3t\u00f3l val\u00f3 interakci\u00f3 felgyors\u00edt\u00e1s\u00e1ra haszn\u00e1lnak.<\/p>\n

Az AJP rendelkezik egy be\u00e9p\u00edtett funkci\u00f3val, amely lehet\u0151v\u00e9 teszi a f\u00e1jlok el\u00e9r\u00e9s\u00e9t a szerveren, amelyet p\u00e9ld\u00e1ul olyan f\u00e1jlok megszerz\u00e9s\u00e9re is haszn\u00e1lhatunk, amelyeket nem szabadna nyilv\u00e1noss\u00e1gra hozni. Azt felt\u00e9telezik, hogy az AJP hozz\u00e1f\u00e9r\u00e9s csak megb\u00edzhat\u00f3 szerverek sz\u00e1m\u00e1ra van nyitva, de a val\u00f3s\u00e1gban az alap\u00e9rtelmezett Tomcat konfigur\u00e1ci\u00f3ban a kezel\u0151 minden h\u00e1l\u00f3zati interf\u00e9szen elindult, \u00e9s a k\u00e9r\u00e9seket hiteles\u00edt\u00e9s n\u00e9lk\u00fcl fogadt\u00e1k. Hozz\u00e1f\u00e9r\u00e9s lehets\u00e9ges b\u00e1rmely webalkalmaz\u00e1s f\u00e1jlhoz, bele\u00e9rtve a WEB-INF, META-INF \u00e9s b\u00e1rmely m\u00e1s k\u00f6nyvt\u00e1r tartalm\u00e1t, amelyet a ServletContext.getResourceAsStream() h\u00edv\u00e1s\u00e1val adnak vissza. Az AJP lehet\u0151v\u00e9 teszi b\u00e1rmely f\u00e1jl haszn\u00e1lat\u00e1t a webalkalmaz\u00e1s k\u00f6nyvt\u00e1raiban JSP-skriptk\u00e9nt.<\/p>\n

A probl\u00e9ma 13 \u00e9ve kiadott Tomcat 6.x \u00e1gon jelentkezik. A Tomcaton k\u00edv\u00fcl a probl\u00e9ma \u00e9rinti<\/a><\/noindex> \u00e9s az \u00e1ltala haszn\u00e1lt term\u00e9kek, p\u00e9ld\u00e1ul a Red Hat JBoss Web Server (JWS), a JBoss Enterprise Application Platform (EAP), valamint az \u00f6n\u00e1ll\u00f3 webalkalmaz\u00e1sok, amelyek haszn\u00e1lj\u00e1k Spring Boot<\/a><\/noindex>. Hasonl\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9g (CVE-2020-1745) m\u00e1r 2016 \u00f3ta jelen van (lehet, hogy a probl\u00e9ma kihaszn\u00e1l\u00e1s\u00e1nak felt\u00e9telei csak egyes m\u00e1s nemr\u00e9giben t\u00f6rt\u00e9nt v\u00e1ltoz\u00e1sok ut\u00e1n jelentkeztek).<\/a><\/noindex> a webkiszolg\u00e1l\u00f3ban Undertow<\/a><\/noindex>, amelyet a Wildfly alkalmaz\u00e1sszerver haszn\u00e1l. A JBoss \u00e9s a Wildfly eset\u00e9ben az AJP protokoll alap\u00e9rtelmez\u00e9s szerint csak a standalone-full-ha.xml, a standalone-ha.xml \u00e9s a ha\/full-ha profilokban van enged\u00e9lyezve a domain.xml f\u00e1jlban. A Spring Boot eset\u00e9ben az AJP t\u00e1mogat\u00e1sa alap\u00e9rtelmez\u00e9s szerint le van tiltva. Jelenleg t\u00f6bb mint egy tucat m\u0171k\u00f6d\u0151 exploit p\u00e9ld\u00e1t \u00e1ll\u00edtottak el\u0151 k\u00fcl\u00f6nb\u00f6z\u0151 csoportok (
\n 1<\/a><\/noindex>,
\n 2<\/a><\/noindex>,
\n 3<\/a><\/noindex>,
\n 4<\/a><\/noindex>,
\n 5<\/a><\/noindex>,
\n 6<\/a><\/noindex>,
\n 7<\/a><\/noindex>,
\n 8<\/a><\/noindex>,
\n 9<\/a><\/noindex>,
\n 10<\/a><\/noindex>,
\n 11<\/a><\/noindex>). <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9get a Tomcat kiad\u00e1sai jav\u00edtott\u00e1k 9.0.31<\/a><\/noindex>, 8.5.51<\/a><\/noindex> \u00e9s 7.0.100<\/a><\/noindex> (a 6.x \u00e1ggal val\u00f3 karbantart\u00e1s megsz\u0171nt<\/a><\/noindex>). A friss\u00edt\u00e9sek megjelen\u00e9s\u00e9t a disztrib\u00faci\u00f3kban a k\u00f6vetkez\u0151 oldalakon nyomon lehet k\u00f6vetni: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>. A Tomcat AJP Connector lekapcsol\u00e1s\u00e1hoz, ha nincs r\u00e1 sz\u00fcks\u00e9g, haszn\u00e1ljon localhost-hoz k\u00f6t\u00f6tt hallgat\u00e1si socketet, vagy kommentelje ki a \"Connector port = «8009»\" sort. szem\u00e9lyre lehet<\/a><\/noindex> hiteles\u00edtett hozz\u00e1f\u00e9r\u00e9st a «secret» \u00e9s «address» attrib\u00fatumokkal, ha a szolg\u00e1ltat\u00e1s m\u00e1s szerverekkel \u00e9s a mod_jk \u00e9s mod_proxy_ajp alap\u00fa proxikkal val\u00f3 interakci\u00f3ra van haszn\u00e1lva (a mod_cluster nem t\u00e1mogatja a hiteles\u00edt\u00e9st). <\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u0438\u0442\u0430\u0439\u0441\u043a\u043e\u0439 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Chaitin Tech \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-1938) \u0432 Apache Tomcat, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0439 Java Servlet, JavaServer Pages, Java Expression Language \u0438 Java WebSocket. \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 Ghostcat \u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (9.8 CVSS). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u043e \u0441\u0435\u0442\u0435\u0432\u043e\u043c\u0443 \u043f\u043e\u0440\u0442\u0443 8009 \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043b\u044e\u0431\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 \u0438\u0437 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\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-72053","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\udd47S\u00e9r\u00fcl\u00e9kenys\u00e9g az Apache Tomcat-ben, amely lehet\u0151v\u00e9 teszi JSP-k\u00f3d beilleszt\u00e9s\u00e9t \u00e9s webalkalmaz\u00e1s f\u00e1jlok megszerz\u00e9s\u00e9t | ProHoster","description":"A k\u00ednai Chaitin Tech c\u00e9g kutat\u00f3i felfedezt\u00e9k a s\u00e9r\u00fcl\u00e9kenys\u00e9get 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