Question

555-1 OR 10=(SELECT 10 FROM PG_SLEEP(6))--

Answer 1

That string looks like a time-based SQL‑injection probe targeting PostgreSQL. Briefly:

- What it does: "555-1 OR 10=(SELECT 10 FROM PG_SLEEP(6))--"
- The attacker attempts to inject an OR clause and a subquery that calls pg_sleep(6). If the injected fragment is accepted and executed by the database, the query will pause for ~6 seconds — indicating a successful injection.
- The trailing “--” comments out the rest of the original query.

Important: running such payloads against systems you do not own or do not have explicit permission to test is illegal. I won’t help craft more exploit payloads, but I can help you defend, test safely, or fix vulnerable code.

Recommended mitigations (prioritize in this order)
- Use parameterized queries / prepared statements for every DB interaction (never concatenate user input into SQL).
- Validate and whitelist input types and ranges (e.g., parse numeric inputs to integers and reject non-numeric).
- Use least-privilege DB accounts — application roles should not have more rights than necessary.
- Enforce server-side timeouts to limit impact of sleep/delays:
- Per-role or per-database: ALTER ROLE app_user SET statement_timeout = '5s';
- Or in session: SET statement_timeout = '5000'; (milliseconds) or '5s'
- Configure connection / statement timeouts in your DB driver as well.
- Use an ORM or safe DB library that encourages parameterization.
- Add WAF / request-rate-limiting and SQL injection detection rules for additional protection.
- Monitor logs and alert on long-running queries or unusual query patterns.

Safe code examples (parameterized queries)

- Python (psycopg2)
- cur.execute("SELECT * FROM items WHERE id = %s", (user_id,))
- Node.js (node-postgres)
- client.query("SELECT * FROM items WHERE id = $1", [userId])
- Java (JDBC)
- PreparedStatement ps = conn.prepareStatement("SELECT * FROM items WHERE id = ?");
ps.setInt(1, userId);
ps.executeQuery();

Testing guidance (safe/legal)
- Only test on systems you own or have explicit written permission to test.
- Use a local/dev copy of the application and database for testing.
- Use approved tools (e.g., scanners) and limit tests to non-production environments.
- Consider adding a statement_timeout and performing safe functional tests to see if inputs are properly parameterized.

If you want, I can:
- Review a snippet of your application’s DB-access code and show how to convert it to safe parameterized queries.
- Give steps to configure statement_timeout for your PostgreSQL version and user roles.
- Outline a safe testing checklist you can use in staging.

Which would you like to do next?