{"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\/hu\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","title":{"rendered":"Az OpenWrt 19.07.1 friss\u00edt\u00e9se a csomagok \u00e1t\u00edr\u00e1s\u00e1t lehet\u0151v\u00e9 t\u00e9v\u0151 sebezhet\u0151s\u00e9g jav\u00edt\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Megjelentek az OpenWrt disztrib\u00faci\u00f3 helyesb\u00edt\u0151 kiad\u00e1sai 18.06.7<\/a><\/noindex> \u00e9s 19.07.1<\/a><\/noindex>, amelyekben jav\u00edtott\u00e1k a vesz\u00e9lyes sebezhet\u0151s\u00e9get<\/a><\/noindex> (CVE-2020-7982) a csomagkezel\u0151ben opkg<\/a><\/noindex>, amely lehet\u0151v\u00e9 teszi a MITM-t\u00e1mad\u00e1st, \u00e9s megv\u00e1ltoztatja a repozit\u00f3riumb\u00f3l let\u00f6lt\u00f6tt csomag tartalm\u00e1t. A k\u00f3dban l\u00e9v\u0151 ellen\u0151rz\u00e9si \u00f6sszeg hib\u00e1ja miatt a t\u00e1mad\u00f3 olyan k\u00f6r\u00fclm\u00e9nyeket tud l\u00e9trehozni, amelyek mellett a digit\u00e1lis al\u00e1\u00edr\u00e1ssal ell\u00e1tott csomagindexben tal\u00e1lhat\u00f3 SHA-256 ellen\u0151rz\u00e9si \u00f6sszegek figyelmen k\u00edv\u00fcl hagy\u00e1sra ker\u00fclnek, ami lehet\u0151v\u00e9 teszi az ipk-er\u0151forr\u00e1sok integrit\u00e1sa ellen\u0151rz\u00e9si mechanizmus\u00e1nak megker\u00fcl\u00e9s\u00e9t.<\/p>\n

A probl\u00e9ma 2017 febru\u00e1rj\u00e1t\u00f3l jelentkezik, miut\u00e1n hozz\u00e1ad\u00e1sok<\/a><\/noindex> figyelmen k\u00edv\u00fcl hagyt\u00e1k az ellen\u0151rz\u00e9si \u00f6sszeg el\u0151tt \u00e1ll\u00f3 kezdeti sz\u00f3k\u00f6z\u00f6ket. A sz\u00f3k\u00f6z\u00f6k kihagy\u00e1s\u00e1nak hib\u00e1ja miatt a mutat\u00f3 nem mozdult el a sorban, \u00e9s a SHA-256 hexadecim\u00e1lis sorozat dek\u00f3dol\u00e1s\u00e1nak ciklusa azonnal visszat\u00e9r a vez\u00e9rl\u00e9shez, \u00e9s egy null\u00e1s hossz\u00fas\u00e1g\u00fa ellen\u0151rz\u00e9si \u00f6sszeget ad vissza. <\/p>\n

Mivel az opkg csomagkezel\u0151 az OpenWrt-ben root jogosults\u00e1gokkal fut, a MITM t\u00e1mad\u00e1s sor\u00e1n a t\u00e1mad\u00f3 lehet\u0151s\u00e9get kap arra, hogy \u00e9szrev\u00e9tlen\u00fcl m\u00f3dos\u00edtsa az ipk csomagot, amelyet a felhaszn\u00e1l\u00f3 az \"opkg install\" parancs v\u00e9grehajt\u00e1sa sor\u00e1n t\u00f6lt le a t\u00e1rol\u00f3b\u00f3l. Ez lehet\u0151v\u00e9 teszi, hogy a t\u00e1mad\u00f3 a saj\u00e1t k\u00f3dj\u00e1t root jogosults\u00e1gokkal futtassa a csomaghoz saj\u00e1t telep\u00edt\u00e9si scriptjeinek hozz\u00e1ad\u00e1s\u00e1val. A sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1hoz a t\u00e1mad\u00f3nak emellett hamis\u00edtania kell a helyes \u00e9s al\u00e1\u00edrt csomagindexet (p\u00e9ld\u00e1ul, amelyet a downloads.openwrt.org szolg\u00e1ltat). A m\u00f3dos\u00edtott csomag m\u00e9ret\u00e9nek meg kell felelnie az indexben meghat\u00e1rozott eredeti m\u00e9retnek.<\/p>\n

Ha el kell ker\u00fclni az eg\u00e9sz firmware friss\u00edt\u00e9s\u00e9t, csak az opkg csomagkezel\u0151t friss\u00edthetj\u00fck az al\u00e1bbi parancsok v\u00e9grehajt\u00e1s\u00e1val:<\/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

Ezut\u00e1n \u00f6ssze kell hasonl\u00edtani a megjelen\u00edtett ellen\u0151rz\u00e9si \u00f6sszegeket, \u00e9s ha egyeznek, v\u00e9gre kell hajtani:<\/p>\n

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

Az \u00faj verzi\u00f3kban egy m\u00e1sik hib\u00e1t is jav\u00edtottak vulnerability<\/a><\/noindex> a k\u00f6nyvt\u00e1rban libubox<\/a><\/noindex>, amely a blobmsg_format_json<\/a><\/noindex> speci\u00e1lisan form\u00e1zott soros\u00edtott bin\u00e1ris adatok vagy JSON form\u00e1tum\u00fa adatok. A k\u00f6nyvt\u00e1r a disztrib\u00faci\u00f3 olyan \u00f6sszetev\u0151iben haszn\u00e1latos, mint a netifd, procd, ubus, rpcd \u00e9s uhttpd, valamint a csomagban auc<\/a><\/noindex> (Folyamatban l\u00e9v\u0151 sysUpgrade CLI). A pufferm\u00e9ret t\u00fall\u00e9p\u00e9se akkor t\u00f6rt\u00e9nik, amikor nagy numerikus attrib\u00fatumokat adunk \u00e1t blob-blokkokban, amelyek t\u00edpusa \"double\". A rendszer sebezhet\u0151s\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9hez a parancsot kell futtatni:<\/p>\n

$ ubus call luci getFeatures \\
\n '{ \"banik\": 00192200197600198000198100200400.1922 }'<\/p>\n

Az OpenWrt 19.07.1 kiad\u00e1sban nemcsak a sebezhet\u0151s\u00e9gek jav\u00edt\u00e1s\u00e1ra \u00e9s a felhalmoz\u00f3dott hib\u00e1k kijav\u00edt\u00e1s\u00e1ra ker\u00fclt sor, hanem a Linux kernel verzi\u00f3ja is friss\u00fclt (4.14.162-r\u0151l 4.14.167-re), tov\u00e1bb\u00e1 megoldott\u00e1k a 5GHz-es frekvenci\u00e1k haszn\u00e1lata k\u00f6zbeni teljes\u00edtm\u00e9nyprobl\u00e9m\u00e1kat, \u00e9s biztos\u00edtott\u00e1k az 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 \u00e9s Netgear R6350 t\u00e1mogat\u00e1s\u00e1t.<\/p>\n

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

Forr\u00e1s: 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 \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 […]<\/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\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\udd47Az OpenWrt 19.07.1 friss\u00edt\u00e9se a csomagok hamis\u00edt\u00e1s\u00e1ra lehet\u0151s\u00e9get ad\u00f3 sebezhet\u0151s\u00e9gek kijav\u00edt\u00e1s\u00e1val | ProHoster","description":"Kijav\u00edt\u00f3 kiad\u00e1sok jelentek meg az OpenWrt 18.06.7 disztrib\u00faci\u00f3ban \u00e9s","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 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