{"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\/et\/blog\/novosti-interneta\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"pppd ja lwIP haavatavus, mis v\u00f5imaldab kaugkoodide k\u00e4ivitamist juur\u00f5igustes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

PPP pakettis tuvastatud<\/a><\/noindex> haavatavus<\/a><\/noindex> (CVE-2020-8597<\/a><\/noindex>), mis v\u00f5imaldab teil oma koodi t\u00e4ita, saates spetsiaalselt vormindatud autentimisettepanekuid s\u00fcsteemidele, mis kasutavad PPP (Point-to-Point Protocol) v\u00f5i PPPoE (PPP \u00fcle Ethernet). Need protokollid on tavaliselt pakkujate poolt kasutusel Etherneti v\u00f5i DSL-i kaudu \u00fchenduse loomisel ning neid kasutatakse m\u00f5nedes VPN-ides (nt pptpd ja openfortivpn<\/a><\/noindex>). Oma s\u00fcsteemide haavatavuse kontrollimiseks on valmistatud<\/a><\/noindex> on olemas eksploidi protot\u00fc\u00fcp.<\/p>\n

Haavatavus on tingitud puhver\u00fclevusest EAP (Extensible Authentication Protocol) autentimisprotokolli rakenduses. R\u00fcnnakut saab teostada autentimise eel, saatmisega paketti, mille t\u00fc\u00fcp on EAPT_MD5CHAP, mis sisaldab v\u00e4ga pikka hostinime, mis ei mahu etten\u00e4htud puhvri sisse. Koodi rikke t\u00f5ttu v\u00e4ljaande rhostname kontrollimisel v\u00f5ib r\u00fcndaja kirjutada andmeid puhvri v\u00e4lisse alasse ja saavutada kaugtegevuse oma koodiga root'i \u00f5igustes. Haavatavus avaldub nii serveri kui kliendi poolel, see t\u00e4hendab, et r\u00fcnnatav v\u00f5ib olla mitte ainult server, vaid ka klient, kes \u00fcritab \u00fchendust saada r\u00fcndaja kontrolli all oleva serveriga (n\u00e4iteks v\u00f5ib r\u00fcndaja esmalt h\u00e4kkida serveri kaudu haavatavuse ja seej\u00e4rel hakata r\u00fcnnama \u00fchenduvaid kliente).<\/p>\n

Probleem m\u00f5jutab versioone pppd<\/a><\/noindex> versioonidest 2.4.2 kuni 2.4.8, sh ja on k\u00f5rvaldatud kujul pat\u0161<\/a><\/noindex>. Haavatavus esineb ka puudutab<\/a><\/noindex> stukis lwIP<\/a><\/noindex>, aga lwIP vaikeseades EAP tugi ei ole sisse l\u00fclitatud.<\/p>\n

Probleemi k\u00f5rvaldamise staatust distributsioonides saab vaadata j\u00e4rgmistelt lehtedelt: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Arch<\/a><\/noindex>, NetBSD<\/a><\/noindex>. \u0412 RHEL, OpenWRT \u0438 SUSE \u043f\u0430\u043a\u0435\u0442 pppd \u0441\u043e\u0431\u0440\u0430\u043d \u0441 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u0437\u0430\u0449\u0438\u0442\u044b «Stack Smashing Protection» (\u0440\u0435\u0436\u0438\u043c «-fstack-protector» \u0432 gcc), \u0447\u0442\u043e \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u0435\u0442 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044e \u043a\u0440\u0430\u0445\u043e\u043c. \u041a\u0440\u043e\u043c\u0435 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u043e\u0432 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u0430\u0445 Cisco<\/a><\/noindex> (CallManager), TP-LINK<\/a><\/noindex> ja Synology (DiskStation Manager, VisualStation VS960HD ja Router Manager), mis kasutavad pppd v\u00f5i lwIP koodi.<\/p>\n

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

Allikas: 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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47N\u00f5rkus pppd ja lwIP-s, mis v\u00f5imaldab kaugelt k\u00e4ivitada koodi root \u00f5igustega | ProHoster","description":"pppd paketis on tuvastatud n\u00f5rkus (CVE-2020-8597), mis v\u00f5imaldab k\u00e4ivitada oma koodi, saates hoolikalt vormindatud autentimise p\u00e4ringuid s\u00fcsteemidele, mis kasutavad PPP (Point-to-Point Protocol) v\u00f5i PPPoE (PPP over Ethernet) protokolli. Need protokollid on tavaliselt kasutusel teenusepakkujate poolt, et korraldada \u00fchendust \u00fcle Etherneti v\u00f5i DSL, samuti kasutatakse neid m\u00f5nedes VPN-ides (n\u00e4iteks pptpd ja openfortivpn). 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\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 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