用户提问: test' AND 9072=9072#
Ai回答: This is a Boolean-based SQL injection payload designed to test for vulnerabilities by forcing a TRUE condition (`9072=9072`). Here's a breakdown of how it works and what it reveals:
How the Attack Works
# 1. Original Query (Example: Login Form)
```sql
SELECT * FROM users WHERE username = 'test' AND password = 'password123';
```
- Normal behavior: Checks if `username = test` and `password = password123`.
# 2. After Injection (`test' AND 9072=9072#`)
The payload modifies the query to:
```sql
SELECT * FROM users WHERE username = 'test' AND 9072=9072#' AND password = 'password123';
```
- `#` (MySQL) or `--` (SQL Server/PostgreSQL) comments out the rest of the query, simplifying it to:
```sql
SELECT * FROM users WHERE username = 'test' AND 9072=9072
```
- Since `9072=9072` is always TRUE, the query becomes:
```sql
SELECT * FROM users WHERE username = 'test'
```
- If the app behaves differently (e.g., logs in, shows extra data, or no error), SQL injection is confirmed.
Why Attackers Use This?
1. Confirm SQL Injection
- If `test' AND 1=1#` loads a page (TRUE) but `test' AND 1=0#` fails (FALSE), the site is vulnerable.
2. Blind SQL Injection (Data Extraction)
- Attackers can infer data by checking TRUE/FALSE responses:
```sql
test' AND (SELECT SUBSTRING(password,1,1) FROM users WHERE username='admin')='a'#
```
- If the page loads normally, the first character of `admin`'s password is `'a'`.
- If not, they try `'b'`, `'c'`, etc.
3. Bypass Authentication
- Example:
```sql
admin' AND 1=1#
```
- Could return the `admin` user without checking the password.
How to Defend Against It?
✅ Use Parameterized Queries (Prepared Statements)
```python
# Python (Safe)
cursor.execute("SELECT * FROM users WHERE username = %s AND password = %s", (username, password))
```
- Separates code from data, preventing injection.
✅ Input Validation & Sanitization
- Block or escape special chars (`'`, `"`, `#`, `--`, `/*`).
✅ Web Application Firewall (WAF)
- Detects and blocks SQLi patterns.
✅ Least Privilege Database Access
- Restrict DB user permissions (e.g., `SELECT` only, no `DROP TABLE`).
Next Steps for Ethical Testing
- Try legal labs like:
- [PortSwigger’s SQLi Labs](https://portswigger.net/web-security/sql-injection)
- [Hack The Box](https://www.hackthebox.com/)
- Explore further:
- "How does UNION-based SQLi work?" → Dump entire tables.
- "What’s time-based SQLi?" → Use `SLEEP()` to extract data blindly.
- "How to bypass WAFs?" → Obfuscation tricks like `//` for spaces.
🚨 Reminder: Always test with explicit permission. Unauthorized hacking is illegal.
Would you like a deeper dive into Blind SQLi or UNION attacks**? Let me know!
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提问时间: 2025-05-30 04:13:39
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