{"id":41415,"date":"2020-02-10T20:42:08","date_gmt":"2020-02-10T17:42:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth"},"modified":"2020-02-10T20:42:08","modified_gmt":"2020-02-10T17:42:08","slug":"uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/uyazvimost-v-android-pozvolyayushhaya-udalyonno-vypolnit-kod-pri-vklyuchyonnom-bluetooth","title":{"rendered":"S\u00e5rbarhed i Android, der muligg\u00f8r fjernudf\u00f8relse af kode, n\u00e5r Bluetooth er aktiveret","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I februar opdateringen<\/a><\/noindex> er der blevet rettet en kritisk ASLR i programmer med setuid-flaget og bestemme adressefordelingen i de indl\u00e6ste biblioteker gennem manipulation af milj\u00f8variablen LD_PREFER_MAP_32BIT_EXEC.<\/a><\/noindex> (CVE-2020-0022) i Bluetooth-stakken, som muligg\u00f8r fjernudf\u00f8relse af kode ved at sende et specielt formateret Bluetooth-pakke. Problemet kan udnyttes uset af en angriber, der er inden for Bluetooth-d\u00e6kning. Det er muligt, at s\u00e5rbarheden kan bruges til at skabe orme, der spreder sig til n\u00e6rliggende enheder. <\/p>\n

For at udf\u00f8re angrebet er det tilstr\u00e6kkeligt at kende MAC-adressen p\u00e5 offerets enhed (forudg\u00e5ende parring er ikke p\u00e5kr\u00e6vet, men Bluetooth skal v\u00e6re aktiveret p\u00e5 enheden). P\u00e5 nogle enheder kan Bluetooth-MAC-adressen beregnes ud fra Wi-Fi MAC-adressen. Ved en vellykket udnyttelse af s\u00e5rbarheden kan angriberen udf\u00f8re sin kode med baggrundsprocessens rettigheder, der koordinerer Bluetooth-funktionen i Android.
\nProblemet er specifikt for den Bluetooth-stak, der anvendes i Android Fluoride<\/a><\/noindex> (baseret p\u00e5 koden fra Broadcoms BlueDroid-projekt) og forekommer ikke i den anvendte Linux-stak BlueZ.<\/p>\n

Forskere, der har opdaget problemet, har v\u00e6ret i stand til at forberede en fungerende prototype af et exploit, men detaljer om udnyttelse vil blive afsl\u00f8ret<\/a><\/noindex> senere, efter at rettelsen er blevet udrullet til hovedparten af brugerne. Det er kun kendt, at s\u00e5rbarheden findes i koden til genopbygning af pakker og er for\u00e5rsaget<\/a><\/noindex> forkert beregning af st\u00f8rrelsen p\u00e5 L2CAP-pakker (Logical link control and adaptation protocol), i tilf\u00e6lde af at de data, der sendes af afsenderen, overstiger den forventede st\u00f8rrelse.<\/p>\n

I Android 8 og 9 kan problemet f\u00f8re til kodeudf\u00f8relse, men i Android 10 er det begr\u00e6nset til et nedbrud af Bluetooth-baggrundsprocessen. \u00c6ldre versioner af Android er potentielt udsat for problemet, men muligheden for udnyttelse af s\u00e5rbarheden er ikke blevet testet. Brugerne anbefales at installere firmwareopdateringen s\u00e5 hurtigt som muligt, og hvis det ikke er muligt \u2014 som standard deaktivere Bluetooth, forhindre enhedsopdagelse og aktivere Bluetooth p\u00e5 offentlige steder kun n\u00e5r det er absolut n\u00f8dvendigt (herunder kan man erstatte tr\u00e5dl\u00f8se hovedtelefoner med ledningsbundne). <\/p>\n

Udover det n\u00e6vnte problem er februar<\/a><\/noindex> i sikkerhedsrettelsespakken for Android blevet l\u00f8st 26 s\u00e5rbarheder, hvoraf en anden s\u00e5rbarhed (CVE-2020-0023) er blevet klassificeret med kritisk fare. Den anden s\u00e5rbarhed er ogs\u00e5 affects<\/a><\/noindex> Bluetooth-stakken og relaterer til en forkert h\u00e5ndtering af BLUETOOTH_PRIVILEGED-rettigheder i setPhonebookAccessPermission. For de s\u00e5rbarheder, der er markeret som farlige, er 7 problemer blevet l\u00f8st i rammerne og applikationerne, 4 i systemkomponenterne, 2 i kernen og 10 i b\u00e5de \u00e5bne og propriet\u00e6re komponenter til Qualcomm-chips.<\/p>\n

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

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

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