{"id":105776,"date":"2022-12-01T15:37:11","date_gmt":"2022-12-01T13:37:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd"},"modified":"2022-12-01T15:37:11","modified_gmt":"2022-12-01T13:37:11","slug":"udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/udalyonno-ekspluatiruemaya-root-uyazvimost-v-utilite-ping-postavlyaemoj-vo-freebsd","title":{"rendered":"T\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 root-sebezhet\u0151s\u00e9g a FreeBSD-hez \u00e9rkez\u0151 ping programban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A FreeBSD-ben felfedeztek egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2022-23093) a ping seg\u00e9dprogramban, amely a rendszer alapszolg\u00e1ltat\u00e1sainak r\u00e9sze. A probl\u00e9ma potenci\u00e1lisan lehet\u0151v\u00e9 teheti a t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t root jogosults\u00e1gokkal, amikor egy t\u00e1mad\u00f3 \u00e1ltal ellen\u0151rz\u00f6tt k\u00fcls\u0151 gazdag\u00e9p pingel\u00e9se t\u00f6rt\u00e9nik. A jav\u00edt\u00e1st a FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 \u00e9s 12.3-RELEASE-p10 friss\u00edt\u00e9sekben javasolj\u00e1k. M\u00e1s BSD rendszerek \u00e9rintetts\u00e9ge a felfedezett s\u00e9r\u00fcl\u00e9kenys\u00e9ggel kapcsolatban egyel\u0151re nem vil\u00e1gos (NetBSD, DragonFlyBSD \u00e9s OpenBSD s\u00e9r\u00fcl\u00e9kenys\u00e9g\u00e9r\u0151l m\u00e9g nem \u00e9rkeztek jelent\u00e9sek). <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g az ICMP \u00fczenetek feldolgoz\u00e1sa sor\u00e1n fell\u00e9p\u0151 puffert\u00falcsordul\u00e1sb\u00f3l ad\u00f3dik, melyek v\u00e1laszk\u00e9nt \u00e9rkeznek a tesztel\u0151 k\u00e9r\u00e9sre. A ping program ICMP \u00fczenetek k\u00fcld\u00e9s\u00e9re \u00e9s fogad\u00e1s\u00e1ra vonatkoz\u00f3 k\u00f3dja nyers socketeket haszn\u00e1l, \u00e9s emelt jogosults\u00e1gokkal fut (a seg\u00e9dprogram setuid root flaggel ker\u00fcl telep\u00edt\u00e9sre). A v\u00e1lasz feldolgoz\u00e1sa a ping oldal\u00e1n t\u00f6rt\u00e9nik, amikor az IP \u00e9s ICMP csomagok fejl\u00e9c\u00e9t rekonstru\u00e1lj\u00e1k a nyers socketb\u0151l \u00e9rkez\u0151 adatokb\u00f3l. Az IP \u00e9s ICMP fejl\u00e9cet a pr_pack() funkci\u00f3 m\u00e1solja a pufferekbe, figyelmen k\u00edv\u00fcl hagyva azt, hogy az IP fejl\u00e9c ut\u00e1n tov\u00e1bbi kiterjesztett fejl\u00e9c is tal\u00e1lhat\u00f3 a csomagban. <\/p>\n

Az ilyen fejl\u00e9ceket a csomagb\u00f3l kiemelik \u00e9s a fejl\u00e9c blokkj\u00e1ba beillesztik, de nem veszik figyelembe a puffer m\u00e9ret\u00e9nek kisz\u00e1m\u00edt\u00e1sakor. Ha a gazdag\u00e9p az ICMP k\u00e9r\u00e9sre v\u00e1laszul kiterjesztett fejl\u00e9cekkel rendelkez\u0151 csomagot k\u00fcld, a tartalmuk a puffer hat\u00e1rain t\u00falra fog \u00edr\u00f3dni a veremben. Ennek k\u00f6vetkezt\u00e9ben a t\u00e1mad\u00f3 ak\u00e1r 40 b\u00e1jt adatot is fel\u00fcl\u00edrhat a veremben, ami potenci\u00e1lisan lehet\u0151v\u00e9 teszi saj\u00e1t k\u00f3dja v\u00e9grehajt\u00e1s\u00e1t. A probl\u00e9ma vesz\u00e9ly\u00e9t m\u00e9rs\u00e9kli, hogy a hiba megjelen\u00e9sekor a folyamat a rendszerh\u00edv\u00e1sok elszigetelt \u00e1llapot\u00e1ban (capability mode) van, ami megnehez\u00edti a tov\u00e1bbi rendszerhez val\u00f3 hozz\u00e1f\u00e9r\u00e9st a s\u00e9r\u00fcl\u00e9kenys\u00e9g kihaszn\u00e1l\u00e1sa ut\u00e1n.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-23093) \u0432 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 ping, \u0432\u0445\u043e\u0434\u044f\u0449\u0435\u0439 \u0432 \u0431\u0430\u0437\u043e\u0432\u0443\u044e \u043f\u043e\u0441\u0442\u0430\u0432\u043a\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 ping \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0445\u043e\u0441\u0442\u0430, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043e \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 FreeBSD 13.1-RELEASE-p5, 12.4-RC2-p2 \u0438 12.3-RELEASE-p10. \u041f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u044b \u043b\u0438 \u0434\u0440\u0443\u0433\u0438\u0435 BSD-\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435 \u044f\u0441\u043d\u043e (\u043e\u0442\u0447\u0451\u0442\u043e\u0432 \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 NetBSD, […]<\/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-105776","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\udd47T\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 root s\u00e9r\u00fcl\u00e9kenys\u00e9g a FreeBSD rendszerben tal\u00e1lhat\u00f3 ping seg\u00e9dprogramban | ProHoster","description":"A FreeBSD-ben felfedeztek egy s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2022-23093) a ping seg\u00e9dprogramban, amely a rendszer alapszolg\u00e1ltat\u00e1sainak 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