用户提问: 555-1; waitfor delay '0:0:57.014' --
Ai回答: This appears to be a time-based blind SQL injection payload. Let's break it down:
🔍 Payload Analysis
```sql
555-1; waitfor delay '0:0:57.014' --
```
1. `555-1`
- Arbitrary input (likely to bypass simple filters).
- Could be used to force an invalid query (e.g., `WHERE id = 555-1`).
2. `;` (Semicolon)
- Terminates the first query and allows a second command (SQL injection).
3. `waitfor delay '0:0:57.014'`
- Time-based SQLi technique: Forces the database to pause for 57.014 seconds.
- If the application takes ~57 seconds to respond, SQL injection is confirmed.
4. `-- ` (Comment)
- Neutralizes the rest of the original query.
🎯 Purpose: Time-Based Blind SQLi
- Goal: Confirm SQL injection when no visible errors or direct output is available.
- How it works:
- If the database executes `waitfor delay`, the response is delayed.
- Attackers then replace the delay with data extraction logic (e.g., `IF (SELECT COUNT(*) FROM users) > 100 WAITFOR DELAY '0:0:5'`).
⚠️ Security Implications
1. Stealthy Exploitation
- No errors or visible output needed—just timing differences.
2. Data Exfiltration
- Attackers can extract data bit by bit (e.g., check if `SUBSTRING(password,1,1) = 'a'` and delay if true).
3. Bypasses Basic Protections
- Works even if error messages are suppressed.
🔒 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
- Block semicolons (`;`), `WAITFOR DELAY`, and other dangerous keywords.
3. Web Application Firewall (WAF)
- Detect and block time-delay attempts.
4. Least Privilege DB Access
- Restrict database permissions to prevent `WAITFOR` execution.
🎯 Safe Testing (Legal Lab Only)
```sql
-- Time-based test (legal environment)
SELECT * FROM users
WHERE id = 1; WAITFOR DELAY '0:0:5' --
-- If the response takes ~5 seconds, SQLi is possible.
```
🔥 Why Attackers Use This
- Silent Recon: No visible errors, just timing differences.
- Data Extraction: Can infer data by checking response delays (e.g., `IF (ASCII(SUBSTRING(password,1,1)) = 97 WAITFOR DELAY '0:0:5'`).
Need a secure coding example? Ask! 🛡️
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提问时间: 2025-07-10 01:24:13
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