{"id":40697,"date":"2020-02-03T14:36:04","date_gmt":"2020-02-03T11:36:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov"},"modified":"2020-02-03T14:36:04","modified_gmt":"2020-02-03T11:36:04","slug":"obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","title":{"rendered":"Aktualizacja OpenWrt 19.07.1 eliminuj\u0105ca luk\u0119 umo\u017cliwiaj\u0105c\u0105 podmian\u0119 pakiet\u00f3w","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Opublikowano poprawki dla dystrybucji OpenWrt 18.06.7<\/a><\/noindex> i 19.07.1<\/a><\/noindex>, w kt\u00f3rych usuni\u0119to gro\u017ana luka<\/a><\/noindex> (CVE-2020-7982) w mened\u017cerze pakiet\u00f3w opkg<\/a><\/noindex>, kt\u00f3ra umo\u017cliwia przeprowadzenie ataku MITM i modyfikacj\u0119 zawarto\u015bci pakietu pobieranego z repozytorium. Z powodu b\u0142\u0119du w kodzie sprawdzania sum kontrolnych, atakuj\u0105cy mo\u017ce stworzy\u0107 warunki, w kt\u00f3rych sumy kontrolne SHA-256, znajduj\u0105ce si\u0119 w podpisanym cyfrowo indeksie pakiet\u00f3w, b\u0119d\u0105 ignorowane, co pozwala na omini\u0119cie mechanizm\u00f3w sprawdzania integralno\u015bci pobieranych zasob\u00f3w ipk.<\/p>\n

Problem ujawni\u0142 si\u0119 od lutego 2017 roku, po dodania<\/a><\/noindex> kodzie ignoruj\u0105cym wst\u0119pne spacje przed sum\u0105 kontroln\u0105. Z powodu b\u0142\u0119du przy pomini\u0119ciu spacji, wska\u017anik pozycji w linii nie by\u0142 przesuwany i p\u0119tla dekoduj\u0105ca szesnastkow\u0105 sekwencj\u0119 SHA-256 od razu zwraca\u0142a kontrol\u0119, przekazuj\u0105c sum\u0119 kontroln\u0105 o zerowej d\u0142ugo\u015bci. <\/p>\n

Poniewa\u017c mened\u017cer pakiet\u00f3w opkg w OpenWrt dzia\u0142a z uprawnieniami roota, w przypadku przeprowadzenia ataku MITM napastnik ma mo\u017cliwo\u015b\u0107 dyskretnego wprowadzenia zmian w pakiecie ipk, pobieranym z repozytorium podczas wykonywania przez u\u017cytkownika polecenia \u201eopkg install\u201d, oraz zorganizowania wykonania swojego kodu z uprawnieniami roota poprzez dodanie do pakietu w\u0142asnych skrypt\u00f3w obs\u0142uguj\u0105cych, wywo\u0142ywanych podczas instalacji. Aby wykorzysta\u0107 t\u0119 podatno\u015b\u0107, napastnik musi r\u00f3wnie\u017c zorganizowa\u0107 podmian\u0119 poprawnego i podpisanego indeksu pakiet\u00f3w (na przyk\u0142ad serwowanego z downloads.openwrt.org). Rozmiar zmodyfikowanego pakietu musi odpowiada\u0107 oryginalnemu rozmiarowi okre\u015blonemu w indeksie.<\/p>\n

W sytuacji, gdy trzeba obej\u015b\u0107 si\u0119 bez aktualizacji ca\u0142ego oprogramowania uk\u0142adowego, mo\u017cna zaktualizowa\u0107 jedynie mened\u017cera pakiet\u00f3w opkg, wykonuj\u0105c nast\u0119puj\u0105ce polecenia:<\/p>\n

cd \/tmp
\n opkg update
\n opkg download opkg
\n zcat .\/opkg-lists\/openwrt_base | grep -A10 \u201ePackage: opkg\u201d | grep SHA256sum
\n sha256sum .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n

Nast\u0119pnie nale\u017cy por\u00f3wna\u0107 pokazane sumy kontrolne i je\u015bli si\u0119 zgadzaj\u0105, wykona\u0107:<\/p>\n

opkg install .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n

W nowych wersjach naprawiono tak\u017ce kolejny luka<\/a><\/noindex> w bibliotece libubox<\/a><\/noindex>, co mo\u017ce prowadzi\u0107 do przepe\u0142nienia bufora podczas przetwarzania w funkcji blobmsg_format_json<\/a><\/noindex> specjalnie sformatowanych zserializowanych danych binarnych lub danych w formacie JSON. Biblioteka jest u\u017cywana w takich komponentach dystrybucji, jak netifd, procd, ubus, rpcd i uhttpd, a tak\u017ce w pakiecie auc<\/a><\/noindex> (Attended sysUpgrade CLI). Przepe\u0142nienie bufora wyst\u0119puje podczas przesy\u0142ania w blokach blob du\u017cych atrybut\u00f3w numerycznych typu \u201edouble\u201d. Sprawdzi\u0107 podatno\u015b\u0107 systemu na t\u0119 luk\u0119 mo\u017cna wykonuj\u0105c polecenie:<\/p>\n

$ ubus call luci getFeatures \\
\n \u2018{ \u201ebanik\u201d: 00192200197600198000198100200400.1922 }\u2019<\/p>\n

Opr\u00f3cz eliminacji luk i naprawy nagromadzonych b\u0142\u0119d\u00f3w w wersji OpenWrt 19.07.1 zaktualizowano tak\u017ce wersj\u0119 j\u0105dra Linux (z 4.14.162 do 4.14.167), rozwi\u0105zano problemy z wydajno\u015bci\u0105 przy u\u017cyciu cz\u0119stotliwo\u015bci 5GHz, nawi\u0105zano wsparcie dla urz\u0105dze\u0144 Ubiquiti Rocket M Titanium, Netgear WN2500RP v1,
\n Zyxel NSA325, Netgear WNR3500 V2, Archer C6 v2, Ubiquiti EdgeRouter-X, Archer C20 v4, Archer C50 v4 Archer MR200, TL-WA801ND v5, HiWiFi HC5962, Xiaomi Mi Router 3 Pro i Netgear R6350.<\/p>\n

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

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430 OpenWrt 18.06.7 \u0438 19.07.1, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7982) \u0432 \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 opkg, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0438\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443 \u0438 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 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\u043f\u043e\u0434\u043f\u0438\u0441\u044c\u044e \u0438\u043d\u0434\u0435\u043a\u0441\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0431\u0443\u0434\u0443\u0442 \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u044b, \u0447\u0442\u043e \u0434\u0430\u0451\u0442 […]<\/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":[],"tags":[],"class_list":["post-40697","post","type-post","status-publish","format-standard","hentry"],"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\udd47Aktualizacja OpenWrt 19.07.1 z eliminacj\u0105 luki, kt\u00f3ra pozwala na podmian\u0119 pakiet\u00f3w | ProHoster","description":"Opublikowano poprawki do 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