{"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\/en\/blog\/news\/predstavlena-novaya-tehnika-ekspluatatsii-uyazvimostej-v-sqlite","title":{"rendered":"A new technique for exploiting vulnerabilities in SQLite has been introduced.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Researchers from Check Point revealed<\/a><\/noindex> at the DEF CON conference provided details on a new attack technique targeting applications that utilize vulnerable versions of SQLite. The Check Point method treats database files as a means for integrating exploitation scripts into various internal SQLite subsystems that are not accessible for direct exploitation. The researchers also developed a technique for exploiting vulnerabilities by encoding the exploit as a chain of SELECT queries in the SQLite database, which allows bypassing ASLR.<\/p>\n

For a successful attack, it is necessary to have the ability to modify the database files of the targeted applications, which limits the method to attacks on applications that use SQLite databases for transit and input data. The method can also be used to extend already obtained local access, for instance, to integrate hidden backdoors into the applications in use, as well as to evade security mechanisms during malware analysis. Exploitation after the file replacement occurs at the moment the application executes the first SELECT query to the table in the modified database.<\/p>\n

An example demonstrates the ability to execute code in iOS when opening the address book, with the database file 'AddressBook.sqlitedb' modified using the proposed method. The attack exploited a vulnerability in the fts3_tokenizer function (CVE-2019-8602, a pointer dereference issue), which was fixed in the April 2.28 SQLite update, along with others. vulnerability<\/a><\/noindex> in the implementation of window functions. Furthermore, the method was demonstrated for remotely capturing control over a PHP backend server used by attackers to gather passwords intercepted during the operation of malware (the intercepted passwords were transmitted in the form of an SQLite database).<\/p>\n

The attack method is based on utilizing two techniques: 'Query Hijacking' and 'Query Oriented Programming', allowing the exploitation of arbitrary issues that lead to memory corruption in the SQLite engine. The essence of 'Query Hijacking' lies in replacing the content of the 'sql' field in the sqlite_master system table, which defines the database structure. This field contains a DDL (Data Definition Language) block used to describe the structure of objects in the database. The description is given using standard SQL syntax, i.e., the 'CREATE TABLE' construct is used.
\nthat is executed during the database initialization process (at the first launch of the function sqlite3LocateTable) to create internal structures linked to the table in memory.
\nThe idea is that by replacing 'CREATE TABLE' with 'CREATE VIEW', it becomes possible to control any access to the database through the definition of one\u2019s view. By using 'CREATE VIEW', the 'SELECT' operation is bound to the table, which will be invoked instead of 'CREATE TABLE' and allows access to various parts of the SQLite interpreter. The simplest way to attack further would be to call the 'load_extension' function, which allows loading any arbitrary library with an extension, but this function is disabled by default.<\/p>\n

The idea is that by replacing 'CREATE TABLE' with 'CREATE VIEW', it becomes possible to control any access to the database through the definition of one's view. With 'CREATE VIEW', the 'SELECT' operation is bound to the table, which will be invoked instead of 'CREATE TABLE', allowing access to various parts of the SQLite interpreter. The simplest method of attack would involve calling the 'load_extension' function, which allows loading any extension library, but this function is disabled by default.<\/p>\n

To carry out an attack under the possibility of executing a 'SELECT' operation, the technique 'Query Oriented Programming' is proposed, which allows the exploitation of issues in SQLite leading to memory corruption. This technique resembles return-oriented programming (, Return-Oriented Programming), but uses nonexistent snippets of machine code to build a chain of calls ('gadgets') instead of actual machine code fragments, embedding them in subqueries within SELECT.<\/a><\/noindex>, Return-Oriented Programming), but utilizes non-existent fragments of machine code for constructing the call chain ('gadgets') by injecting subquery inserts within SELECT.<\/p>\n

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

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