{"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 risoluzione di una vulnerabilit\u00e0 che consentiva la sostituzione dei pacchetti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pubblicate le versioni correttive della distribuzione OpenWrt 18.06.7<\/a><\/noindex> e 19.07.1<\/a><\/noindex>, in cui \u00e8 stato risolto una vulnerabilit\u00e0 critica<\/a><\/noindex> (CVE-2020-7982) nel gestore pacchetti opkg<\/a><\/noindex>, che consente di eseguire un attacco MITM e di sostituire il contenuto del pacchetto scaricato dal repository. A causa di un errore nel codice di verifica dei checksum, un attaccante pu\u00f2 creare condizioni in cui i checksum SHA-256, presenti nell'indice dei pacchetti firmato digitalmente, verranno ignorati, fornendo la possibilit\u00e0 di eludere i meccanismi di verifica dell'integrit\u00e0 delle risorse ipk scaricate.<\/p>\n

Il problema si manifesta da febbraio 2017, dopo l'aggiunta<\/a><\/noindex> di codice per ignorare gli spazi iniziali che precedono il checksum. A causa di un errore nel salto degli spazi, non si spostava il puntatore sulla posizione nella stringa e il ciclo di decodifica della sequenza esadecimale SHA-256 restituiva immediatamente il controllo, fornendo un checksum di lunghezza zero. <\/p>\n

Poich\u00e9 il gestore di pacchetti opkg in OpenWrt viene eseguito con i diritti di root, in caso di attacco MITM un aggressore ha la possibilit\u00e0 di modificare silenziosamente un pacchetto ipk caricato dal repository durante l'esecuzione del comando «opkg install» da parte dell'utente, e di eseguire il proprio codice con diritti di root aggiungendo script gestori personalizzati nel pacchetto 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 a quella originale definita nell'indice.<\/p>\n

In una situazione in cui \u00e8 necessario evitare di aggiornare l'intero firmware, \u00e8 possibile aggiornare solo il gestore pacchetti opkg eseguendo i seguenti comandi:<\/p>\n

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

Dopo, \u00e8 necessario confrontare gli hash mostrati e, se coincidono, eseguire:<\/p>\n

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

Nelle nuove versioni \u00e8 stata corretta anche un'altra una vulnerabilit\u00e0<\/a><\/noindex> nella libreria libubox<\/a><\/noindex>, che pu\u00f2 portare a un overflow del buffer durante l'elaborazione nella funzione blobmsg_format_json<\/a><\/noindex> di dati binari serializzati appositamente formattati o dati in formato JSON. La libreria viene utilizzata in componenti della distribuzione come netifd, procd, ubus, rpcd e uhttpd, cos\u00ec come nel pacchetto auc<\/a><\/noindex> (Attended sysUpgrade CLI). Il buffer overflow si verifica quando vengono trasmessi nei blob blocchi attributi numerici grandi di tipo «double». Per verificare la vulnerabilit\u00e0 del sistema, \u00e8 possibile eseguire il comando:<\/p>\n

$ ubus call luci getFeatures \
\n ‘{ «banik»: 00192200197600198000198100200400.1922 }’<\/p>\n

Oltre a risolvere le vulnerabilit\u00e0 e correggere gli errori accumulati, nella versione di OpenWrt 19.07.1 \u00e8 stato aggiornato anche il kernel Linux (da 4.14.162 a 4.14.167), risolti problemi di prestazioni nell'uso delle frequenze a 5GHz, ed \u00e8 stato migliorato il supporto per i dispositivi 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 e Netgear R6350.<\/p>\n

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

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

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A causa di un errore nel codice di verifica dei checksum, un attaccante pu\u00f2 creare condizioni in cui i checksum SHA-256, presenti nell'indice dei pacchetti firmato digitalmente, vengano ignorati, consentendo\u5982\u6b64.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 OpenWrt 19.07.1 \u0441 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0435\u0439 \u043f\u043e\u0434\u043c\u0435\u043d\u0443 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 | ProHoster","og:description":"\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, 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