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Update my naive sql.java #155

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Update my naive sql.java #155

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5 changes: 5 additions & 0 deletions my naive sql.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,11 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response) t
try {
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db");
String user = request.getParameter("username");
String query = "SELECT * FROM users WHERE username = '" + request.getParameter("username") + "';";
Statement stmt = con.createStatement();

stmt.executeQuery(query);
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@github-actions github-actions bot May 29, 2025 •
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image SQL Injection fix is ready

This change fixes a high severity (🚩) SQL Injection issue reported by Snyk.

Issue description

SQL Injection allows attackers to execute malicious SQL queries by manipulating input data. This can result in unauthorized access to sensitive data, data manipulation, or even complete database compromise.

Fix instructions

Use parameterized queries or prepared statements to sanitize user input and prevent manipulation of the SQL query.

diff --git a/my naive sql.java b/my naive sql.java
--- a/my naive sql.java
+++ b/my naive sql.java
@@ -1,3 +1,4 @@
+import java.sql.PreparedStatement;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
@@ -11,10 +12,11 @@
         try {
             Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db");
             String user = request.getParameter("username");
-            String query = "SELECT * FROM users WHERE username = '" + request.getParameter("username") + "';";
-            Statement stmt = con.createStatement();
+            String query = "SELECT * FROM users WHERE username = ?;";
+            PreparedStatement stmt = con.prepareStatement(query);
 
-            stmt.executeQuery(query);
+            stmt.setString(1, request.getParameter("username"));
+            stmt.executeQuery();
 
         } catch (Exception e) {
             throw new ServletException(e);


Learn more and fine tune the fix


} catch (Exception e) {
throw new ServletException(e);
}
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