{"id":41185,"date":"2020-02-06T14:41:55","date_gmt":"2020-02-06T11:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/openwrt-19-07-1"},"modified":"2020-02-06T14:41:55","modified_gmt":"2020-02-06T11:41:55","slug":"openwrt-19-07-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/openwrt-19-07-1","title":{"rendered":"OpenWrt 19.07.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"


\n \"OpenWrt<\/p>\n

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

<\/p>\n

Versioner av OpenWrt-distributionen har sl\u00e4ppts 18.06.7<\/a> och 19.07.1<\/a>, d\u00e4r s\u00e5rbarhet<\/a> CVE-2020-7982 i paketchefen opkg har \u00e5tg\u00e4rdats, vilket m\u00f6jliggjorde MITM-attacker och byte av inneh\u00e5llet i paket som laddas ner fr\u00e5n arkivet. P\u00e5 grund av ett fel i kontrollsummekontrollen kunde angriparen ignorera SHA-256-kontrollsummorna fr\u00e5n paketet, vilket gjorde att integritetskontrollmekanismerna f\u00f6r de nedladdade ipk-resurserna kunde kringg\u00e5s.<\/p>\n

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

Problemet har funnits sedan februari 2017, efter att koden f\u00f6r att ignorera inledande mellanslag f\u00f6re kontrollsumman lades till. P\u00e5 grund av felet i att hoppa \u00f6ver mellanslag flyttades inte pekaren p\u00e5 positionen i str\u00e4ngen och avkodningscykeln f\u00f6r den hexadecimala sekvensen SHA-256 returnerade omedelbart kontrollen och gav kontrollsumman av noll l\u00e4ngd.<\/p>\n

P\u00e5 grund av att pakethanteraren opkg k\u00f6rdes som root, kunde en angripare \u00e4ndra inneh\u00e5llet i ipk-paketet under en MITM-attack, som laddades ner fr\u00e5n repositoryt n\u00e4r anv\u00e4ndaren k\u00f6rde kommandot «opkg install». Angriparen kunde d\u00e4rmed k\u00f6ra sin egen kod med root-r\u00e4ttigheter genom att l\u00e4gga till egna skript som anropades vid installationen. F\u00f6r att utnyttja s\u00e5rbarheten m\u00e5ste angriparen ocks\u00e5 \u00e4ndra paketindexet (till exempel det som levereras fr\u00e5n downloads.openwrt.org). Den \u00e4ndrade paketstorleken m\u00e5ste motsvara den ursprungliga, enligt indexet.<\/p>\n

I de nya versionerna har \u00e4ven ett annat s\u00e5rbarhet<\/a> problem i libubox \u00e5tg\u00e4rdats, som kan leda till buffert\u00f6verfl\u00f6d vid hantering av s\u00e4rskilt formaterade serialiserade bin\u00e4ra data eller data i JSON-format i funktionen blobmsg_format_json. <\/p>\n

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

K\u00e4lla: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u044b\u0445 ipk-\u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":41186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-41185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\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\udd47OpenWrt 19.07.1 | 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