{"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\/da\/blog\/news\/uyazvimost-v-pppd-i-lwip-pozvolyayushhaya-udalyonno-vypolnit-kod-s-pravami-root","title":{"rendered":"S\u00e5rbarhed i pppd og lwIP, som muligg\u00f8r fjernudf\u00f8relse af kode med root-rettigheder","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I pakken pppd opdaget<\/a><\/noindex> ASLR i programmer med setuid-flaget og bestemme adressefordelingen i de indl\u00e6ste biblioteker gennem manipulation af milj\u00f8variablen LD_PREFER_MAP_32BIT_EXEC.<\/a><\/noindex> (CVE-2020-8597<\/a><\/noindex>), som tillader udf\u00f8relse af egen kode via specielt konstruerede anmodninger om autentificering til systemer, der bruger PPP-protokollen (Point-to-Point Protocol) eller PPPoE (PPP over Ethernet). Disse protokoller anvendes typisk af udbydere til at etablere forbindelse via Ethernet eller DSL, og de anvendes ogs\u00e5 i nogle VPN'er (for eksempel pptpd og openfortivpn<\/a><\/noindex>). For at kontrollere, om dine systemer er udsat for dette problem er forberedt<\/a><\/noindex> prototype af exploit.<\/p>\n

S\u00e5rbarheden skyldes en buffer-overl\u00f8b i implementeringen af autentifikationsprotokollen EAP (Extensible Authentication Protocol). Angrebet kan udf\u00f8res f\u00f8r autentificeringen ved at sende en pakke af typen EAPT_MD5CHAP, som inkluderer et meget langt v\u00e6rt navn, der ikke kan passe ind i den tildelte buffer. P\u00e5 grund af en fejl i koden, der tjekker st\u00f8rrelsen af feltet rhostname, kan angriberen overskrive data uden for bufferen i stakken og opn\u00e5 fjernudf\u00f8relse af egen kode med root-rettigheder. S\u00e5rbarheden manifesterer sig p\u00e5 server- og klientsiden, hvilket betyder, at b\u00e5de serveren og klienten, der fors\u00f8ger at oprette forbindelse til en server kontrolleret af angriberen, kan blive angrebet (for eksempel kan en angriber f\u00f8rst hacke serveren via s\u00e5rbarheden og derefter begynde at ramme de tilsluttede klienter).<\/p>\n

Problemet ber\u00f8rer versioner pppd<\/a><\/noindex> fra 2.4.2 til 2.4.8 inklusive og er blevet l\u00f8st i version et patch<\/a><\/noindex>. S\u00e5rbarheden findes ogs\u00e5 affects<\/a><\/noindex> stakken lwIP<\/a><\/noindex>, men i standardkonfigurationen i lwIP er EAP-support ikke aktiveret.<\/p>\n

Status for problemet i distributionerne kan ses p\u00e5 f\u00f8lgende sider: Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Arch<\/a><\/noindex>, NetBSD<\/a><\/noindex>. I RHEL, OpenWRT og SUSE er pakken pppd samlet med indbygget beskyttelse mod «Stack Smashing Protection» (tilstand «-fstack-protector» i gcc), hvilket begr\u00e6nser udnyttelsen af nedbrud. Udover distributionerne er s\u00e5rbarheden ogs\u00e5 bekr\u00e6ftet i nogle produkter Cisco<\/a><\/noindex> (CallManager), TP-LINK<\/a><\/noindex> og Synology (DiskStation Manager, VisualStation VS960HD og Router Manager), der bruger koden fra pppd eller lwIP.<\/p>\n

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

Kilde: 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\udd47S\u00e5rbarhed i pppd og lwIP, der muligg\u00f8r fjernudf\u00f8relse af kode med root-rettigheder | ProHoster","description":"I pakken pppd er der opdaget en 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