用户提问: -1 OR 5*5=26 --
Ai回答: Let's analyze `-1 OR 5*5=26 --` as a SQL injection test case:
What This Does Differently:
1. False Condition (`5*5=26`)
- Unlike `5*5=25` (which is always true), this is *mathematically false*
- Tests how the application handles false conditions in SQL logic
Expected Behaviors:
1. If Vulnerable to Injection:
```sql
SELECT * FROM products WHERE id = -1 OR 5*5=26 -- AND stock > 0
```
- Returns no results because:
- `id = -1` fails (assuming no product has ID -1)
- `5*5=26` is false
- `--` comments out the rest
2. If Blocked/Protected:
- May show:
- A SQL error message
- A generic "invalid input" page
- A security filter warning
Why Test False Conditions?
1. Confirm Boolean Logic Control
- Contrast with the true condition (`5*5=25`) to observe behavioral differences
2. Identify Blind SQLi Scenarios
- In blind injections, you might detect differences in:
- HTTP response time
- Error messages
- Page content length
3. Bypass Simple Filters
- Some WAFs only block tautologies (`1=1`) but allow false conditions
⚠️ Legal Testing Only
```sql
-- Safe test in a lab environment
CREATE TABLE test(id INT, name VARCHAR(10));
INSERT INTO test VALUES (1,'Apple'), (2,'Orange');
-- True condition (returns both rows)
SELECT * FROM test WHERE id = -1 OR 5*5=25;
-- False condition (returns nothing)
SELECT * FROM test WHERE id = -1 OR 5*5=26;
```
Would you like me to explain how to:
1. Distinguish between true/false responses in blind SQLi?
2. Build a legal practice lab with false condition testing?
3. Explore more advanced conditional payloads?
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提问时间: 2025-07-10 01:21:17
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