{"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\/nl\/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

De versies van de OpenWrt-distributie zijn uitgegeven 18.06.7<\/a> en 19.07.1<\/a>, waarin is gecorrigeerd kwetsbaarheid<\/a> CVE-2020-7982 in de pakketbeheerder opkg, waarmee een MITM-aanval kon worden uitgevoerd om de inhoud van het uit een repository gedownloade pakket te vervangen. Door een fout in de controle van de controlegetallen kon de aanvaller de SHA-256 controlegetallen van het pakket negeren, waardoor de mechanismen voor de integriteitscontrole van de gedownloade ipk-bronnen konden worden omzeild.<\/p>\n

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

Het probleem bestaat sinds februari 2017, nadat er code was toegevoegd om de lege spaties te negeren die v\u00f3\u00f3r het controlegetal kwamen. Door een fout bij het overslaan van de spaties verschoof de aanwijzer niet naar de juiste positie in de string en gaf de hexadecimale decodering van de SHA-256-reeks onmiddellijk de controle terug met een controlegetal van nul lengte.<\/p>\n

Omdat het opkg-pakketbeheer vanuit root werd uitgevoerd, kon een aanvaller de inhoud van het ipk-pakket wijzigen tijdens een MITM-aanval, terwijl het pakket vanuit de repository werd gedownload tijdens de uitvoering van de opdracht «opkg install». Hierdoor kon de aanvaller zijn eigen code met root-rechten uitvoeren door eigen verwerkingsscripts aan het pakket toe te voegen, die tijdens de installatie werden aangeroepen. Om gebruik te maken van de kwetsbaarheid moest de aanvaller ook de pakkettenindex vervalsen (bijvoorbeeld die geleverd vanaf downloads.openwrt.org). De grootte van het gewijzigde pakket moest overeenkomen met de oorspronkelijke grootte in de index.<\/p>\n

In de nieuwe versies is ook een ander probleem opgelost kwetsbaarheid<\/a> in de libubox-bibliotheek, die kan leiden tot een bufferoverflow bij het verwerken in de functie blobmsg_format_json van speciaal opgemaakte geserialiseerde binaire gegevens of gegevens in JSON-formaat. <\/p>\n

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

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

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\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\u0433 \u043f\u0440\u043e\u0438\u0433\u043d\u043e\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0435 \u0441\u0443\u043c\u043c\u044b SHA-256 \u0438\u0437 \u043f\u0430\u043a\u0435\u0442\u0430, \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u043b\u043e \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 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