{"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\/it\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","title":{"rendered":"Aggiornamento OpenWrt 19.07.1 con la correzione di una vulnerabilit\u00e0 che consente la sostituzione dei pacchetti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sono stati pubblicati aggiornamenti correttivi per la distribuzione OpenWrt <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021541.html\"> 18.06.7<\/a><\/noindex> e  <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021543.html\">19.07.1<\/a><\/noindex>, in cui \u00e8 stata rimossa  <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021544.html\">una vulnerabilit\u00e0 pericolosa<\/a><\/noindex> (CVE-2020-7982) nel gestore pacchetti <noindex><a rel=\"nofollow\" href=\"https:\/\/openwrt.org\/docs\/guide-user\/additional-software\/opkg\">opkg<\/a><\/noindex>, che consente di eseguire un attacco MITM e modificare il contenuto del pacchetto scaricato dal repository. A causa di un errore nel codice di verifica dei checksum, un attaccante potrebbe creare condizioni in cui i checksum SHA-256, presenti nell'indice dei pacchetti firmato digitalmente, vengono ignorati, permettendo di eludere i meccanismi di verifica dell'integrit\u00e0 delle risorse ipk scaricate.<\/p>\n<p>Il problema si \u00e8 manifestato a partire da febbraio 2017, dopo <noindex><a rel=\"nofollow\" href=\"https:\/\/git.openwrt.org\/54cc7e3\">l'aggiunta<\/a><\/noindex> di codice per ignorare gli spazi iniziali che precedono il checksum. A causa di un errore nel salto degli spazi, il puntatore sulla stringa non veniva spostato e il ciclo di decodifica della sequenza esadecimale SHA-256 restituiva immediatamente il controllo, fornendo un checksum di lunghezza zero. <\/p>\n<p>Poich\u00e9 il gestore pacchetti opkg in OpenWrt viene eseguito con privilegi di root, in caso di attacco MITM un attaccante pu\u00f2 modificare silenziosamente il pacchetto ipk scaricato dal repository durante l'esecuzione del comando &#171;opkg install&#187; da parte dell'utente, e pu\u00f2 eseguire il proprio codice con privilegi di root aggiungendo script di gestione personalizzati al pacchetto, che vengono chiamati durante l'installazione. Per sfruttare la vulnerabilit\u00e0, l'attaccante deve anche sostituire l'indice dei pacchetti corretto e firmato (ad esempio, quello fornito da downloads.openwrt.org). La dimensione del pacchetto modificato deve corrispondere alla dimensione originale definita nell'indice.<\/p>\n<p>In situazioni in cui \u00e8 necessario evitare l'aggiornamento dell'intero firmware, \u00e8 possibile aggiornare solo il gestore pacchetti opkg eseguendo i seguenti comandi:<\/p>\n<p>   cd \/tmp<br \/>\n   opkg update<br \/>\n   opkg download opkg<br \/>\n   zcat .\/opkg-lists\/openwrt_base | grep -A10 &#171;Package: opkg&#187; | grep SHA256sum<br \/>\n   sha256sum .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n<p>Successivamente, \u00e8 necessario confrontare i checksum mostrati e, se coincidono, eseguire:<\/p>\n<p>   opkg install .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n<p>Nelle nuove versioni \u00e8 stata anche rimossa un'altra <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021545.html\">vulnerabilit\u00e0<\/a><\/noindex> nella libreria <noindex><a rel=\"nofollow\" href=\"https:\/\/openwrt.org\/docs\/techref\/libubox\">libubox<\/a><\/noindex>, che pu\u00f2 portare a un overflow del buffer durante l'elaborazione nella funzione <noindex><a rel=\"nofollow\" href=\"https:\/\/lxr.openwrt.org\/ident?i=blobmsg_format_json\">blobmsg_format_json<\/a><\/noindex> di dati binari serializzati formattati o dati in formato JSON. La libreria viene utilizzata in componenti della distribuzione come netifd, procd, ubus, rpcd e uhttpd, nonch\u00e9 nel pacchetto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/openwrt\/packages\/blob\/master\/utils\/auc\/src\/auc.c#L676\">auc<\/a><\/noindex> (Attended sysUpgrade CLI). Il buffer overflow si verifica quando si trasmettono in blocchi blob attributi numerici di grandi dimensioni con il tipo \u00abdouble\u00bb. \u00c8 possibile verificare la vulnerabilit\u00e0 del sistema eseguendo il seguente comando:<\/p>\n<p>    $ ubus call luci getFeatures \\<br \/>\n       \u2018{ \u00abbanik\u00bb: 00192200197600198000198100200400.1922 }\u2019<\/p>\n<p>Oltre a risolvere le vulnerabilit\u00e0 e correggere gli errori accumulati, nella versione OpenWrt 19.07.1 \u00e8 stata anche aggiornata la versione del kernel Linux (da 4.14.162 a 4.14.167), risolvendo problemi di prestazioni con l'uso delle frequenze a 5GHz, e migliorato il supporto per i dispositivi Ubiquiti Rocket M Titanium, Netgear WN2500RP v1,<br \/>\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 e Netgear R6350.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52287\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u043e\u0433\u043e \u0438\u0437 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430. \u0418\u0437-\u0437\u0430 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0445 \u0441\u0443\u043c\u043c, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0436\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u0438\u044f, \u043f\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0435 \u0441\u0443\u043c\u043c\u044b SHA-256, \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0432 \u0437\u0430\u0432\u0435\u0440\u0435\u043d\u043d\u043e\u043c \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \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 [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" 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