{"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\/ro\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","title":{"rendered":"Actualizarea OpenWrt 19.07.1 cu remedierea unei vulnerabilit\u0103\u021bi care permite \u00eenlocuirea pachetelor","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Au fost publicate versiuni corective ale distribu\u021biei OpenWrt 18.06.7<\/a><\/noindex> \u0219i 19.07.1<\/a><\/noindex>, \u00een care a fost remediat\u0103 vulnerabilitate periculoas\u0103<\/a><\/noindex> (CVE-2020-7982) \u00een managerul de pachete opkg<\/a><\/noindex>, care permite executarea unui atac MITM \u0219i \u00eenlocuirea con\u021binutului pachetului desc\u0103rcat din repository. Din cauza unei erori \u00een codul de verificare a sumelor de control, un atacator poate crea condi\u021bii \u00een care sumele de control SHA-256, prezente \u00een indexul pachetelor semnat digital, vor fi ignorate, ceea ce permite ocolirea mecanismelor de verificare a integrit\u0103\u021bii resurselor ipk desc\u0103rcate.<\/p>\n

Problema s-a manifestat din februarie 2017, dup\u0103 ad\u0103ugarea<\/a><\/noindex> codului care ignor\u0103 spa\u021biile de \u00eenceput \u00eenainte de suma de control. Din cauza unei erori la omiterea spa\u021biilor, indicatorul de pozi\u021bie din \u0219ir nu a fost mutat \u0219i ciclul de decodare a secven\u021bei hexazecimale SHA-256 returna imediat controlul, oferind o sum\u0103 de control de lungime zero. <\/p>\n

Deoarece managerul de pachete opkg din OpenWrt ruleaz\u0103 cu privilegii de root, \u00een cazul \u00een care se organizeaz\u0103 un atac MITM, atacatorul are posibilitatea de a modifica \u00een t\u0103cere pachetul ipk desc\u0103rcat din repository \u00een timpul execut\u0103rii comenzii \u201eopkg install\u201d de c\u0103tre utilizator, organiz\u00e2nd astfel executarea propriului cod cu privilegii de root prin ad\u0103ugarea \u00een pachet a propriilor scripturi-handler, apelate la instalare. Pentru a exploata vulnerabilitatea, atacatorul trebuie de asemenea s\u0103 \u00eenlocuie corect \u0219i semnat indexul pachetelor (de exemplu, livrat de la downloads.openwrt.org). Dimensiunea pachetului modificat trebuie s\u0103 corespund\u0103 dimensiunii originale, definite \u00een index.<\/p>\n

\u00cen situa\u021bia \u00een care este necesar s\u0103 se evite actualizarea \u00eentregii firmware, se poate actualiza numai managerul de pachete opkg, execut\u00e2nd urm\u0103toarele comenzi:<\/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

Apoi, trebuie comparate sumele de control afi\u0219ate \u0219i, dac\u0103 acestea coincid, se va executa:<\/p>\n

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

\u00cen noile versiuni a fost anche eliminat\u0103 o alt\u0103 vulnerabilitatea<\/a><\/noindex> \u00een biblioteca libubox<\/a><\/noindex>, care poate duce la un overflow de buffer \u00een timpul proces\u0103rii func\u021biei blobmsg_format_json<\/a><\/noindex> de date binare serializate corespunz\u0103tor sau de date \u00een format JSON. Biblioteca este folosit\u0103 \u00een componentele distribu\u021biei, cum ar fi netifd, procd, ubus, rpcd \u0219i uhttpd, precum \u0219i \u00een pachetul auc<\/a><\/noindex> (Actualizarea sysUpgrade CLI). O dep\u0103\u0219ire a buffer-ului apare atunci c\u00e2nd se transmit atribute numerice mari de tip 'double' \u00een blocuri blob. Pentru a verifica expunerea sistemului la vulnerabilitate, se poate executa comanda:<\/p>\n

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

Pe l\u00e2ng\u0103 remedierile vulnerabilit\u0103\u021bilor \u0219i corectarea erorilor acumulate \u00een versiunea OpenWrt 19.07.1, a fost actualizat \u0219i nucleul Linux (de la 4.14.162 la 4.14.167), rezolv\u00e2nd problemele de performan\u021b\u0103 la utilizarea frecven\u021belor de 5GHz, fiind posibil\u0103 suportul pentru dispozitivele 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 \u0219i Netgear R6350.<\/p>\n

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

Sursa: opennet.ro<\/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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