Contents
How is SQL injection used in web applications?
SQL injection is a technique used to exploit user data through web page inputs by injecting SQL commands as statements. Basically, these statements can be used to manipulate the application’s web server by malicious users. SQL injection is a code injection technique that might destroy your database.
Why are there so many SQL injection vulnerabilities?
Because so many modern applications are data-driven and accessible via the web, SQL Injection vulnerabilities are widespread and easily exploited. Additionally, because of the prevalence of shared database infrastructure, a SQL Injection flaw in one application can lead to the compromise of other applications sharing the same database instance.
Can a negative value be used in SQL injection?
However, a negative value is a good guess because an identifier in a database is rarely a negative number. In SQL Injection, the UNION operator is commonly used to attach a malicious SQL query to the original query intended to be run by the web application.
How does input filtering protect against SQL injection?
While input filtering can help stop the most trivial of attacks, it does not fix the underlying vulnerability . In many cases, input filtering can be evaded by attackers leaving your web application vulnerable despite attempts to, for example, deny-list certain characters on a web form.
How is SQL injection used in penetration test?
For the purposes of this demonstration, we have performed a security audit on a sample web application. During our penetration test, we have identified a plugin endpoint that accepts the user ID via a $_GET request and displays their user name. The endpoint is directly accessible, which could indicate weak security.
Are there any other databases susceptible to SQL injection attacks?
It’s important to realize that the SQL injection attacks are not limited to SQL Server. Other databases, including Oracle, MySQL, DB2, Sybase, and others are susceptible to this type of attack. SQL injection attacks are possible because the SQL language contains a number of features that make it quite powerful and flexible, namely:
Where can I find a SQL injection cheat sheet?
Use public resources such as “SQL Injection Cheat Sheet” at http://ferruh.mavituna.com/makale/sql-injection-cheatsheet/, and try different approaches for adding logic to SQL queries. Add logic to query, and use detailed error messages from the server to debug the query.