{"id":73151,"date":"2020-03-07T14:42:03","date_gmt":"2020-03-07T11:42:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root"},"modified":"2020-03-07T14:42:03","modified_gmt":"2020-03-07T11:42:03","slug":"uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"Sebezhet\u0151s\u00e9g a pppd \u00e9s lwIP-ben, amely t\u00e1volr\u00f3l lehet\u0151v\u00e9 teszi a k\u00f3d root jogokkal val\u00f3 v\u00e9grehajt\u00e1s\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A pppd csomagban identified<\/a><\/noindex> vulnerability<\/a><\/noindex> (CVE-2020-8597<\/a><\/noindex>), amely lehet\u0151v\u00e9 teszi a saj\u00e1t k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a PPP (Point-to-Point Protocol) vagy PPPoE (PPP over Ethernet) protokollt haszn\u00e1l\u00f3 rendszerek hiteles\u00edt\u00e9si k\u00e9r\u00e9s\u00e9nek speci\u00e1lisan form\u00e1zott \u00fczeneteinek k\u00fcld\u00e9s\u00e9vel. Ezeket a protokollokat \u00e1ltal\u00e1ban az internetszolg\u00e1ltat\u00f3k alkalmazz\u00e1k Ethernet vagy DSL kapcsolat l\u00e9trehoz\u00e1s\u00e1ra, illetve egyes VPN-ekben (p\u00e9ld\u00e1ul pptpd \u00e9s openfortivpn<\/a><\/noindex>). A rendszerek sebezhet\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9hez elk\u00e9sz\u00edtett<\/a><\/noindex> az exploit protot\u00edpusa.<\/p>\n

A sebezhet\u0151s\u00e9g a EAP (Extensible Authentication Protocol) hiteles\u00edt\u00e9si protokoll megval\u00f3s\u00edt\u00e1s\u00e1ban fell\u00e9p\u0151 puffer t\u00falcsordul\u00e1s miatt keletkezik. A t\u00e1mad\u00e1s az autentik\u00e1ci\u00f3 folyamat\u00e1nak el\u0151ttr\u0151l, egy EAPT_MD5CHAP t\u00edpus\u00fa csomag k\u00fcld\u00e9s\u00e9vel v\u00e9gezhet\u0151 el, amely nagyon hossz\u00fa hosztnevet tartalmaz, amely nem f\u00e9r el a kijel\u00f6lt pufferben. A rhostname mez\u0151 m\u00e9ret\u00e9nek ellen\u0151rz\u00e9s\u00e9ben l\u00e9v\u0151 hiba miatt a t\u00e1mad\u00f3 fel\u00fcl tudja \u00edrni a pufferen k\u00edv\u00fcli adatokat a veremben, \u00e9s t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st \u00e9rhet el root jogosults\u00e1gokkal. A sebezhet\u0151s\u00e9g a szerver \u00e9s az \u00fcgyf\u00e9l oldal\u00e1n is megjelenik, teh\u00e1t nemcsak a szerver, hanem az \u00fcgyf\u00e9l is t\u00e1madhat\u00f3, aki a t\u00e1mad\u00f3 \u00e1ltal ir\u00e1ny\u00edtott szerverhez pr\u00f3b\u00e1l csatlakozni (p\u00e9ld\u00e1ul a t\u00e1mad\u00f3 el\u0151sz\u00f6r felt\u00f6ri a s\u00e9r\u00fcl\u00e9keny szervert, majd elkezdi t\u00e1madni a csatlakoz\u00f3 \u00fcgyfeleket).<\/p>\n

A probl\u00e9ma a k\u00f6vetkez\u0151 verzi\u00f3kat \u00e9rinti: pppd<\/a><\/noindex> 2.4.2-t\u0151l 2.4.8-ig bez\u00e1r\u00f3an, \u00e9s a patch form\u00e1j\u00e1ban<\/a><\/noindex>form\u00e1j\u00e1ban ker\u00fclt kijav\u00edt\u00e1sra. A sebezhet\u0151s\u00e9g szint\u00e9n \u00e9rinti<\/a><\/noindex> a h\u00edv\u00e1sok lwIP<\/a><\/noindex>, de az alap\u00e9rtelmezett lwIP konfigur\u00e1ci\u00f3ban az EAP t\u00e1mogat\u00e1sa nincs enged\u00e9lyezve.<\/p>\n

A probl\u00e9ma kijav\u00edt\u00e1s\u00e1nak st\u00e1tusz\u00e1t a k\u00f6vetkez\u0151 oldalakon lehet megtekinteni: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Arch<\/a><\/noindex>, NetBSD<\/a><\/noindex>. A RHEL, OpenWRT \u00e9s SUSE rendszerekben a pppd csomag Stack Smashing Protection v\u00e9delemmel van \u00f6sszegy\u0171jtve (a gcc -fstack-protector m\u00f3dja), amely korl\u00e1tozza a kihaszn\u00e1l\u00e1st a rendszer \u00f6sszeoml\u00e1s\u00e1nak k\u00f6vetkezt\u00e9ben. A disztrib\u00faci\u00f3k mellett a sebezhet\u0151s\u00e9get n\u00e9h\u00e1ny term\u00e9kben is meger\u0151s\u00edtett\u00e9k. Cisco<\/a><\/noindex> (CallManager), TP-LINK<\/a><\/noindex> \u00e9s a Synology (DiskStation Manager, VisualStation VS960HD \u00e9s Router Manager), amelyek pppd vagy lwIP k\u00f3dot haszn\u00e1lnak.<\/p>\n

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

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

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 pppd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-8597), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043d\u0430 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u043c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b PPP (Point-to-Point Protocol) \u0438\u043b\u0438 PPPoE (PPP over Ethernet). \u0414\u0430\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u044b \u043e\u0431\u044b\u0447\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u0430\u043c\u0438 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0447\u0435\u0440\u0435\u0437 Ethernet \u0438\u043b\u0438 DSL, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 VPN (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, pptpd \u0438 openfortivpn). \u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0441\u0432\u043e\u0438\u0445 […]<\/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-73151","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\udd47Sebezhet\u0151s\u00e9g a pppd \u00e9s lwIP eset\u00e9ben, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t root jogosults\u00e1gokkal | ProHoster","description":"A pppd csomagban sebezhet\u0151s\u00e9get fedeztek 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