用户提问: -1 OR 3*2>5 --
Ai回答: Your payload (`-1 OR 3*2>5 -- `) is a valid SQL injection test designed to bypass authentication or manipulate logic. Here's how it works:
Breakdown of the Payload:
```sql
-1 OR 3*2>5 --
```
1. `-1`
- Forces a non-matching condition (e.g., if the query checks for `id=-1`, it won’t exist).
2. `OR 3*2>5`
- `3*2=6`, and `6>5` evaluates to `TRUE`.
- This makes the entire condition `TRUE` regardless of other logic.
3. `-- ` (SQL comment)
- Ignores the rest of the query (e.g., `AND password='...'`).
Example Attack Scenario:
If the original SQL query is:
```sql
SELECT * FROM users WHERE id = [INPUT] AND password = '...'
```
Your payload transforms it into:
```sql
SELECT * FROM users WHERE id = -1 OR 6>5 -- AND password = '...'
```
Result:
- The query returns all rows (because `6>5` is always true).
Use Cases:
1. Bypass Login:
- If this payload is injected into a login form, it might grant access without credentials.
2. Boolean-Based Blind SQLi:
- Can infer database structure by testing true/false conditions (e.g., `OR (SELECT SUBSTRING(password,1,1)='a') -- `).
Defense (How to Fix This):
Use parameterized queries (prepared statements) instead of concatenating user input:
```python
# Python (Safe Example)
cursor.execute("SELECT * FROM users WHERE id = ?", (user_input,))
```
Next Steps?
- Need a more advanced payload (e.g., time-based, UNION attacks)?
- Want help securing your code?
*(Note: Only test on systems you own or have permission to audit.)*
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提问时间: 2025-07-10 01:23:45
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