用户提问: -1 OR 3*2>999 --
Ai回答: This appears to be a classic boolean-based blind SQL injection payload. Let's analyze it:
🔍 Payload Breakdown:
```sql
-1 OR 3*2>999 --
```
1. `-1`
- Typically used to force a false condition (e.g., `WHERE id = -1` returns no results).
2. `OR 3*2>999`
- `3*2` evaluates to `6`, so `6>999` is false.
- If the database executes this, it means SQL injection is possible.
3. `-- ` (Double dash with space)
- SQL comment (neutralizes the rest of the query).
🎯 Purpose: Boolean-Based Blind SQLi
- Goal: Test if the application is vulnerable without visible errors.
- How it works:
- If the query executes, the attacker knows SQL injection is possible.
- Later, they might replace `3*2>999` with a true condition (`1=1`) or data extraction logic (e.g., `SUBSTR(password,1,1)='a'`).
⚠️ Security Implications
1. Boolean Exploitation
- An attacker can infer data by checking if conditions are true/false (e.g., `OR (SELECT COUNT(*) FROM users) > 100`).
2. No Errors Needed
- Works even if error messages are suppressed.
3. Bypasses Simple Filters
- Uses arithmetic (`3*2`) to evade naive keyword blocking.
🔒 How to Prevent This
1. Use Parameterized Queries (Prepared Statements)
```python
# Safe example (Python/SQLite)
cursor.execute("SELECT * FROM users WHERE id = ?", (user_input,))
```
2. Input Validation
- Reject unexpected characters (`OR`, `--`, `>`).
3. WAF Rules
- Block queries containing `OR` followed by arithmetic/logic.
4. Least Privilege DB Access
- Restrict database permissions.
🎯 Safe Testing (Legal Lab Only)
```sql
-- Boolean-based test (legal environment)
SELECT * FROM users
WHERE id = -1 OR 1=1; -- Returns all rows if vulnerable
```
🔥 Why Attackers Use This
- Stealthy: No visible errors or delays.
- Powerful: Can extract data bit by bit (e.g., `OR (SELECT SUBSTR(password,1,1) FROM users WHERE id=1)='a'`).
Need a secure coding example? Ask! 🛡️
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提问时间: 2025-07-10 01:23:22
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