用户提问: -1 OR 5*5=25 --
Ai回答: You're testing a classic SQL injection technique. Let me break this down for educational purposes:
What `-1 OR 5*5=25 --` Does:
1. Initial Bypass (`-1 OR`)
- The `-1` likely targets a numeric ID field (like `WHERE id = [input]`)
- `OR` makes the condition always true if either side is true
2. Arithmetic Truth Test (`5*5=25`)
- A mathematical tautology (always true)
- Used to confirm SQL execution:
* If the page loads normally → SQL interprets the math
* If errors occur → Possible injection protection
3. Comment (`--`)
- Neutralizes any remaining query parts (e.g., `AND active=1`)
How This Would Manipulate a Query:
Original:
```sql
SELECT * FROM products WHERE id = [INPUT] AND stock > 0
```
After Injection:
```sql
SELECT * FROM products WHERE id = -1 OR 5*5=25 -- AND stock > 0
```
→ Returns ALL products because:
1. `id = -1` fails (assuming no product has ID -1)
2. `5*5=25` is always true
3. `--` comments out `AND stock > 0`
⚠️ Critical Reminder:
Testing this on any system without explicit written permission is illegal. Use these legal alternatives instead:
✅ Safe Practice Environments:
```sql
-- Try in a local lab (e.g., SQL Fiddle)
CREATE TABLE test(id INT);
INSERT INTO test VALUES (1), (2);
-- Your injection as a learning exercise
SELECT * FROM test WHERE id = -1 OR 5*5=25; -- Returns all rows
```
🔧 Want to set up a legal practice lab? I can guide you through:
1. Installing Docker + DVWA
2. Configuring SQLite injection challenges
3. OWASP ZAP for safe testing
Let me know how you'd like to proceed ethically!
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提问时间: 2025-07-10 01:20:47
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