{"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\/news\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"Turbepuudus pppd ja lwIP-s, mis v\u00f5imaldab kaugelt juurdep\u00e4\u00e4su koodile.","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 k\u00e4ivitada oma koodi, saates spetsiaalselt vormistatud autentimisp\u00e4ringud s\u00fcsteemidele, mis kasutavad PPP (Point-to-Point Protocol) v\u00f5i PPPoE (PPP \u00fcle Ethernet). Neid protokolle kasutavad tavaliselt teenusepakkujad Etherneti v\u00f5i DSL \u00fchenduste korraldamiseks ning need on kasutusel ka m\u00f5nedes VPN-id (n\u00e4iteks pptpd ja openfortivpn<\/a><\/noindex>). Oma s\u00fcsteemide haavatavuse kontrollimiseks on ette valmistatud<\/a><\/noindex> eksplooitprotot\u00fc\u00fcp.<\/p>\n

Haavatavus tuleneb puhver\u00fclevoolust autentimisprotokolli EAP (Extensible Authentication Protocol) rakenduses. R\u00fcnnakut saab teha enne autentimist, saates EAPT_MD5CHAP t\u00fc\u00fcpi paketi, mis sisaldab v\u00e4ga pikka hostinime, mis ei mahu m\u00e4\u00e4ratud puhvrit. Rikka rhostname ala m\u00f5\u00f5du kontrolli vea t\u00f5ttu v\u00f5ib r\u00fcndaja kirjutada andmeid puhvri piirest v\u00e4lja, saavutades oma koodi kaugk\u00e4ivitamise root \u00f5igustega. Haavatavus avaldub nii serveri kui ka kliendi poolel, see t\u00e4hendab, et r\u00fcnnatud v\u00f5ib olla mitte ainult server, vaid ka klient, kes \u00fcritab \u00fchendust luua r\u00fcndaja kontrollitava serveriga (n\u00e4iteks v\u00f5ib r\u00fcndaja esmalt r\u00fcnnata serverit ja seej\u00e4rel alustada \u00fchenduvate klientide kahjustamist).<\/p>\n

Probleem m\u00f5jutab versioone pppd<\/a><\/noindex> versioonide vahemikus 2.4.2 kuni 2.4.8, sealhulgas, ja see on lahendatud kujul patch<\/a><\/noindex>. Haavatavus on samuti puudutab<\/a><\/noindex> puhvri lwIP<\/a><\/noindex>, kuid lwIP vaikeseadetes ei ole EAP tugi sisse l\u00fclitatud.<\/p>\n

Probleemi lahenduse olekut 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>. RHEL-is, OpenWRT-is ja SUSE-is on pppd-pakett kokku pandud «Stack Smashing Protection» kaitsega (re\u017eiim «-fstack-protector» gcc-s), mis piirab seadme ekspluateerimist. Lisaks distributsioonidele on haavatavust kinnitatud ka m\u00f5nedes toodetes. 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 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