SQL injection testing involves the following steps: Determine the input points in the application. Constructs a test case containing the injected code. Perform a test and observe the application response. Analyze responses for error messages, unexpected results, or sensitive data. Identify vulnerabilities and use more complex test cases. Report the results to the developer or security team.
How to test SQL injection
Introduction
SQL injection is a network security vulnerability that allows an attacker to perform arbitrary SQL queries. It can be done by injecting malicious code into the query entered by the user. Testing SQL injection is critical to protecting web applications from such attacks.
Test steps
1. Identify the input point
First, determine all input fields that may have SQL injection vulnerabilities in the application. This usually includes a search box, a login form, and a registration page.
2. Construct the test case
Next, create the test case to try to enter the injection code. These cases should include:
- Single quotes ('): This is the most common SQL injection technique. It tries to close the current query and execute a new query.
- Double quotes ("): In some cases, double quotes can be used to bypass single quote filtering.
- Backslash(): Backslashes can be used to escape special characters, such as single quotes.
- Comment symbols (--): Comment symbols can be used to create multi-line queries.
- Keywords (such as UNION): Keywords can be used to combine multiple queries or retrieve data from other tables.
3. Perform the test
Use constructed test cases, enter them into the target input field and observe the application's response.
4. Analyze the response
If the application returns an error message, unexpected result, or sensitive data, there is a SQL injection vulnerability. In some cases, tools such as Burp Suite or SQLMap may be required to analyze application responses.
5. Confirm the vulnerability
If the analysis indicates a vulnerability, use more complex test cases (such as blinds) to confirm this. Blind annotation involves inferring information from the application response without directly displaying the result.
6. Report the results
Report the test results to the developers or security team so that they can take the necessary measures to patch the vulnerabilities.
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