{"id":37011,"date":"2019-10-31T22:15:16","date_gmt":"2019-10-31T19:15:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/predstavlena-novaya-tehnika-ekspluatatsii-uyazvimostej-v-sqlite\/"},"modified":"2019-10-31T22:15:16","modified_gmt":"2019-10-31T19:15:16","slug":"predstavlena-novaya-tehnika-ekspluatatsii-uyazvimostej-v-sqlite","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/predstavlena-novaya-tehnika-ekspluatatsii-uyazvimostej-v-sqlite","title":{"rendered":"Bemutat\u00e1sra ker\u00fclt egy \u00faj s\u00e9r\u00fcl\u00e9kenys\u00e9gkihaszn\u00e1l\u00e1si technika az SQLite-ban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Check Point kutat\u00f3i felfedt\u00e9k<\/a><\/noindex> a DEF CON konferenci\u00e1n r\u00e9szletezt\u00e9k az \u00faj t\u00e1mad\u00e1si technik\u00e1kat, amelyek a sebezhet\u0151 SQLite verzi\u00f3kat haszn\u00e1l\u00f3 alkalmaz\u00e1sokat c\u00e9lozz\u00e1k. A Check Point m\u00f3dszere a DB f\u00e1jlokat potenci\u00e1lis lehet\u0151s\u00e9gk\u00e9nt kezeli a sebezhet\u0151s\u00e9gek kihaszn\u00e1l\u00e1s\u00e1hoz sz\u00fcks\u00e9ges szkriptek integr\u00e1l\u00e1s\u00e1ra a SQLite k\u00fcl\u00f6nb\u00f6z\u0151 bels\u0151 alrendszereibe, amelyek nem \u00e9rhet\u0151k el k\u00f6zvetlen\u00fcl. A kutat\u00f3k emellett kidolgozt\u00e1k a sebezhet\u0151s\u00e9gek kihaszn\u00e1l\u00e1s\u00e1ra szolg\u00e1l\u00f3 technik\u00e1t, amely az exploitat SELECT lek\u00e9rdez\u00e9sek l\u00e1nc\u00e1nak form\u00e1j\u00e1ban k\u00f3dolja a SQLite DB-ben, lehet\u0151v\u00e9 t\u00e9ve az ASLR \u00e1tugr\u00e1s\u00e1t.<\/p>\n

A sikeres t\u00e1mad\u00e1shoz sz\u00fcks\u00e9ges, hogy a t\u00e1madott alkalmaz\u00e1sok DB f\u00e1jljainak m\u00f3dos\u00edt\u00e1s\u00e1ra lehet\u0151s\u00e9g legyen, ami korl\u00e1tozza a m\u00f3dszert az SQLite DB-t tranzit- \u00e9s bemeneti adatok form\u00e1tumak\u00e9nt haszn\u00e1l\u00f3 alkalmaz\u00e1sok t\u00e1mad\u00e1s\u00e1ra. A m\u00f3dszer alkalmazhat\u00f3 a m\u00e1r megszerzett helyi hozz\u00e1f\u00e9r\u00e9s kiterjeszt\u00e9s\u00e9re is, p\u00e9ld\u00e1ul rejtett h\u00e1ts\u00f3 bej\u00e1ratok integr\u00e1l\u00e1s\u00e1ra a haszn\u00e1lt alkalmaz\u00e1sokba, valamint a biztons\u00e1gi kutat\u00f3k \u00e1ltal v\u00e9gzett \u00e1rtalmas szoftverelemz\u00e9s sor\u00e1n a v\u00e9delmi mechanizmusok megker\u00fcl\u00e9s\u00e9re. A f\u00e1jl cser\u00e9je ut\u00e1n a kihaszn\u00e1l\u00e1s a m\u00f3dos\u00edtott DB t\u00e1bl\u00e1hoz els\u0151k\u00e9nt elk\u00fcld\u00f6tt SELECT lek\u00e9rdez\u00e9s v\u00e9grehajt\u00e1sakor t\u00f6rt\u00e9nik.<\/p>\n

P\u00e9ldak\u00e9nt demonstr\u00e1lva van a k\u00f3d futtat\u00e1s\u00e1nak lehet\u0151s\u00e9ge iOS rendszeren, amikor megnyitjuk a c\u00edmt\u00e1rat, azzal a f\u00e1jllal, amelynek adatb\u00e1zisa «AddressBook.sqlitedb» a javasolt m\u00f3dszer felhaszn\u00e1l\u00e1s\u00e1val lett m\u00f3dos\u00edtva. A t\u00e1mad\u00e1s alapj\u00e1ul a fts3_tokenizer funkci\u00f3ban felfedezett s\u00e9r\u00fcl\u00e9kenys\u00e9g szolg\u00e1lt (CVE-2019-8602, pointer derefer\u00e1l\u00e1si lehet\u0151s\u00e9g), amelyet a SQLite 2.28 \u00e1prilisi friss\u00edt\u00e9s\u00e9ben jav\u00edtottak, m\u00e1s hasonl\u00f3an. sebezhet\u0151s\u00e9g<\/a><\/noindex> az ablakos funkci\u00f3k megval\u00f3s\u00edt\u00e1s\u00e1ban. Ezen k\u00edv\u00fcl bemutat\u00e1sra ker\u00fclt a m\u00f3dszer alkalmaz\u00e1sa egy PHP backend szerver t\u00e1voli \u00e1tad\u00e1s\u00e1nak megszerz\u00e9s\u00e9re, amely a k\u00e1rtev\u0151 k\u00f3d v\u00e9grehajt\u00e1sa sor\u00e1n \u00f6sszegy\u0171jt\u00f6tt jelszavakat t\u00e1rolta (a lehallgatott jelszavakat SQLite DB form\u00e1j\u00e1ban tov\u00e1bb\u00edtott\u00e1k).<\/p>\n

A t\u00e1mad\u00e1s m\u00f3dszere k\u00e9t technika, a «Query Hijacking» \u00e9s a «Query Oriented Programming» haszn\u00e1lat\u00e1n alapul, amelyek lehet\u0151v\u00e9 teszik tetsz\u0151leges probl\u00e9m\u00e1k kihaszn\u00e1l\u00e1s\u00e1t, amelyek mem\u00f3riazavart okoznak a SQLite motorban. A «Query Hijacking» l\u00e9nyege a sqlite_master seg\u00e9dt\u00e1bl\u00e1ban tal\u00e1lhat\u00f3 «sql» mez\u0151 tartalm\u00e1nak megv\u00e1ltoztat\u00e1sa, amely az adatb\u00e1zis strukt\u00far\u00e1j\u00e1t hat\u00e1rozza meg. Ez a mez\u0151 DDL (Data Definition Language) blokkot tartalmaz, amely az adatb\u00e1zis objektumainak strukt\u00far\u00e1j\u00e1t \u00edrja le. A le\u00edr\u00e1s a standard SQL szintaxissal t\u00f6rt\u00e9nik, azaz a «CREATE TABLE» konstrukci\u00f3t alkalmazz\u00e1k.
\namely a DB inicializ\u00e1l\u00e1sa sor\u00e1n hajt\u00f3dik v\u00e9gre (az els\u0151 ind\u00edt\u00e1skor
\na sqlite3LocateTable f\u00fcggv\u00e9ny) a t\u00e1bl\u00e1hoz kapcsol\u00f3d\u00f3 bels\u0151 strukt\u00far\u00e1k l\u00e9trehoz\u00e1s\u00e1hoz a mem\u00f3ri\u00e1ban.<\/p>\n

Az \u00f6tlet az, hogy a «CREATE TABLE» kifejez\u00e9s «CREATE VIEW» kifejez\u00e9sre val\u00f3 cser\u00e9j\u00e9vel lehet\u0151s\u00e9g ny\u00edlik arra, hogy a saj\u00e1t n\u00e9zet\u00fcnk defini\u00e1l\u00e1s\u00e1val b\u00e1rmilyen adatb\u00e1zis-hozz\u00e1f\u00e9r\u00e9st ir\u00e1ny\u00edtsunk. A «CREATE VIEW» seg\u00edts\u00e9g\u00e9vel egy 'SELECT' m\u0171velet van t\u00e1rs\u00edtva a t\u00e1bl\u00e1hoz, amely a «CREATE TABLE» helyett lesz megh\u00edvva, \u00e9s lehet\u0151s\u00e9get ad a SQLite \u00e9rtelmez\u0151 tov\u00e1bbi r\u00e9szeinek el\u00e9r\u00e9s\u00e9re. Ezenk\u00edv\u00fcl a legegyszer\u0171bb t\u00e1mad\u00e1si m\u00f3dszer a «load_extension» f\u00fcggv\u00e9ny h\u00edv\u00e1sa lenne, amely lehet\u0151v\u00e9 teszi tetsz\u0151leges b\u0151v\u00edtm\u00e9ny bet\u00f6lt\u00e9s\u00e9t, de ez a funkci\u00f3 alap\u00e9rtelmez\u00e9s szerint le van tiltva.<\/p>\n

A t\u00e1mad\u00e1shoz, ahol «SELECT» m\u0171velet v\u00e9grehajt\u00e1s\u00e1ra van lehet\u0151s\u00e9g, a «Query Oriented Programming» technik\u00e1t javasolj\u00e1k, amely lehet\u0151v\u00e9 teszi a SQLite hasonl\u00f3 mem\u00f3riahib\u00e1inak kihaszn\u00e1l\u00e1s\u00e1t. Ez a technika hasonl\u00edt a visszat\u00e9r\u00e9s-orient\u00e1lt programoz\u00e1sra (ROP<\/a><\/noindex>, Return-Oriented Programming), de a h\u00edv\u00e1si l\u00e1ncok («gadgetek») fel\u00e9p\u00edt\u00e9s\u00e9hez nem l\u00e9tez\u0151 g\u00e9pk\u00f3d-r\u00e9szleteket haszn\u00e1l, hanem a SELECT bels\u0151 alprogramjaiba illesztett bet\u00e9teket.<\/p>\n

\"Bemutat\u00e1sra<\/a><\/noindex><\/center>
\n
\"Bemutat\u00e1sra<\/a><\/noindex><\/center><\/p>\n

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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0441 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0432 \u0444\u043e\u0440\u043c\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27740,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"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\udd47\u00daj sebezhet\u0151s\u00e9gkihaszn\u00e1l\u00e1si technika ker\u00fclt bemutat\u00e1sra az SQLite-ban | ProHoster","description":"A Check Point v\u00e1llalat 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