![]() ![]() Manually creating/updating a SQL query to accept dynamic parameters.The main cases we identified this solution would be used are: Please refer to SQL Injections and prevention methods to minimize the risk of SQL injections. Misuse of thise solution gives a hacker the possibility to get unwanted privileges and/or break the web pages and database. ![]() The purpose of this method is to let experienced developers create dynamic SQL queries. ![]() The responsibility of writing secure code falls on the user or third party software developer. This solution requires the user to edit the code manually, or to install a third-party extension that creates such code. Important: Users cannot generate such code using the Objects and Server Behaviors that ship with Dreamweaver 8.0.2 or CS3 (Example: Inserting a Recordset via the Server Behaviors panel or Insert bar). So how can we protect against SQL injections while still allowing for dynamic parameters and keeping the resulting code editable via the Server Behaviors panel in Dreamweaver? The solution is to insert the dynamic parameters into the SQL query itself, rather than passing them as classic SQL parameters (which would either be escaped or appended to the SQL via prepared statements). The following example shows a simple PHP Recordset that uses a dynamic SQL parameter to filter results. Prepared statements for PHP became available with MySQL 4.1, but because we wanted to support previous versions of MySQL as well, we decided to implement a custom function that does virtually the same thing. Please refer to SQL Injection Attacks by Example for additional information on SQ injection attacks. Dreamweaver 8.0.2 and CS3 use the prepared statements approach for ASP_VBS, ASP_JavaScript, Cold Fusion and JSP server models, and the escape the user's input approach for the PHP_MySQL server model. We recommend prepared statements which are described in more detail in Using prepared statements. Escape all characters that can cause issues when used inside a SQL query (for example, single quotes). ![]() Restrict input to a minimum set of allowed characters by automatically removing all other characters that falls outside of the given range.Use one of the following measures to protect your website from SQL injections: SELECT * FROM company_com WHERE name_com = 'x' DROP TABLE company_com -' Moreover, if the user wants to delete the entire company_com table, he/she may do this by simply passing the following string "x' DROP TABLE company_com -"(without the surrounding quotes). SELECT * FROM company_com WHERE name_com = 'blabla' OR '1'='1' By giving this sequence of characters, the user will have access to all companies instead of a single company. Considering the example above, a SQL injection will be easy achievable by entering the following string "blabla' OR '1'='1"(without the surrounding quotes). SELECT * FROM company_com WHERE name_com = 'Adobe'īut there are cases when users may want to break the web site and steal sensitive information and/or destroy the database. In the best case scenario, when the user enters "Adobe" (without the quotes) in the input corresponding to the company name, the given SQL query will look like this: In the example above, the $companyName variable is read from a input form field, so the user have the total control of what value will be submitted. SELECT * FROM company_com WHERE name_com = '$companyName' Please visit Wikipedia for additional information. It is in fact an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another. The vulnerability is present when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby unexpectedly executed. A SQL Injection is a technique that exploits a security vulnerability occurring in the database layer of an application. ![]()
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