跟chatgpt學SQL injection attack

我:

'' OR '1'='1'

GPT:

The string you provided is a SQL injection attack. It is an attempt to exploit a vulnerability in a web application's database by inserting malicious SQL code into a form field. The code you provided, '' OR '1'='1', is designed to manipulate the query to always evaluate to true, regardless of the values of any other conditions in the query. This could potentially allow an attacker to gain unauthorized access to sensitive data or perform other malicious actions.

It is important to always sanitize user input and use prepared statements or parameterized queries when executing SQL queries to prevent SQL injection attacks. Web developers should also ensure that their applications are running the latest security patches and updates to minimize the risk of vulnerabilities being exploited.

看來chatgpt還真的懂阿

'' OR '1'='1', is designed to manipulate the query to always evaluate to true

這段就是一個操作利用 '1'='1'讓True成立,常見的手法

問他多一點

我:

have more sample of SQL injection attack?

GPT:

Sure, here are a few examples of SQL injection attacks:

SELECT * FROM users WHERE username = '' or 1=1 --' AND password = '';

This attack exploits the fact that the SQL query will always return true if 1=1, so it will bypass the authentication check and return all the data from the users table.

2.Deleting data from a table:

DELETE FROM users WHERE username = 'admin'; DROP TABLE users;

This attack is using a technique called "SQL injection with stacked queries". By adding an additional query to the end of the original query, the attacker can execute multiple SQL commands in a single injection. In this example, the attacker is trying to delete the entire users table after deleting the admin user.

3.Modifying data in a table:

UPDATE users SET password = 'newpassword' WHERE username = 'admin' or 1=1 --';

This attack is using the same principle as the first example, by injecting a condition that always returns true. The attacker can then modify the password for any user in the table, not just the admin user.

These are just a few examples of SQL injection attacks. It is important to be aware of these types of attacks and take steps to prevent them in your web applications.

第一個直接bypass the authentication跳過授權

第二個刪除整個資料表

第三個直接改密碼成newpassword

再問他有沒有更多範例:

我:

have more sample of SQL injection attack?

GPT:

Sure, here are a few more examples of SQL injection attacks:

1.Selecting a specific column from a table:

SELECT username FROM users WHERE id = 1 UNION SELECT password FROM users WHERE id = 1;

This attack is using the UNION operator to combine two SELECT statements into a single result set. The first SELECT statement selects the username of the user with ID 1, while the second SELECT statement selects the password of the same user. By combining these two SELECT statements with the UNION operator, the attacker can retrieve both the username and password of the user with ID 1.

2.Retrieving data from a different table:

SELECT * FROM users WHERE username = 'admin' UNION SELECT credit_card_number, expiration_date FROM credit_cards;

This attack is using the UNION operator again to combine two SELECT statements into a single result set. The first SELECT statement retrieves data from the users table where the username is 'admin', while the second SELECT statement retrieves credit card data from a different table. By combining these two SELECT statements with the UNION operator, the attacker can retrieve credit card data for the user with the username 'admin'.

3.Blind SQL injection:

SELECT * FROM users WHERE username = 'admin' AND SUBSTRING(password, 1, 1) = 'a';

This attack is using a technique called "blind SQL injection". The attacker doesn't get any data directly from the database, but instead uses the application's response to infer information about the data. In this example, the attacker is trying to determine the first letter of the admin user's password by using the SUBSTRING function to extract the first character of the password. If the application responds with a successful result, the attacker knows that the first character of the password is 'a'. The attacker can then repeat this process to determine the rest of the password, one character at a time.

These are just a few more examples of SQL injection attacks. It's important to be aware of these types of attacks and take steps to prevent them in your web applications.

第一個攻擊就是檢索username和password的id屬於1的使用者帳密

第二個攻擊就是從不同的表中檢索數據,藉由第一個 SELECT 語句從用戶名為“admin”的用戶表中檢索數據，而第二個 SELECT 語句從不同的表中檢索信用卡數據通過將這兩個 SELECT 語句與 UNION 運算符組合，攻擊者可以檢索用戶名為“admin”的用戶的信用卡數據。

第三個攻擊叫做SQL盲注攻擊者不直接從數據庫中獲取任何數據，而是使用應用程序的響應來推斷有關數據的信息,在此示例中，攻擊者試圖通過使用 SUBSTRING 函數提取密碼的第一個字符來確定 admin 用戶密碼的第一個字母

如果應用程序響應成功，則攻擊者知道密碼的第一個字符是“a”。然後，攻擊者可以重複此過程以確定密碼的其餘部分，一次一個字符。