-1' OR 5*5=26 --

Question 1

Задача Задача №3621703

А

Аноним

18 июня 2026 04:45 · публичный вопрос

А

Аноним 18 июня 2026 04:45

-1' OR 5*5=26 --

Answer

That looks like a classic (albeit imperfect) SQL injection payload. Here’s a concise breakdown and what it means for an exam:

What it tries to do

-1' ends a string literal in SQL.
OR introduces a boolean condition to alter the logic of the WHERE clause.
55=26 is a boolean expression; since 55 equals 25, 25=26 is false.
-- starts a SQL comment, so the rest of the query is ignored.

Putting it together, in a vulnerable query like: SELECT * FROM users WHERE username = 'USER_INPUT' AND password = 'PASS'; and with USER_INPUT = -1' OR 5*5=26 --, the query could become: SELECT * FROM users WHERE username = '-1' OR 25=26 --' AND password = 'PASS'; Which effectively reduces to: SELECT * FROM users WHERE username = '-1' OR 25=26; Because 25=26 is false, the OR clause relies on the first condition (-1). This might not grant access unless a user named -1 exists. The important thing is: the pattern demonstrates how an attacker tries to break out of a string literal and alter the WHERE logic, then uses -- to ignore the rest of the query.

Key takeaways for exams

This is an injection attempt: it demonstrates closing a string, injecting an OR condition, and commenting out the rest.
The exact effectiveness depends on the rest of the query and data; in this case, 5*5=26 is false, so it wouldn’t trivially bypass authentication, but the technique is the vulnerability being tested.
Real risk comes from concatenating user input into SQL without parameterization.

Defenses (what to write in an exam answer)

Use prepared statements / parameterized queries (bind user input as parameters, not string concatenation).
Use ORM/abstractions that automatically parameterize queries.
Validate and sanitize inputs; implement white-list checks for expected formats (e.g., usernames).
Principle of least privilege: database user used by the app should have minimal rights.
Disable multiple statements if your DB supports it, or configure your ORM incorrectly to prevent stacking statements.
Error handling: don’t reveal detailed SQL errors to the user; use generic messages.
Consider using stored procedures with parameters (but still ensure they’re parameterized).
Deploy Web Application Firewall (WAF) and monitor for suspicious patterns.

If you want, I can:

Show a minimal vulnerable example and a secure, parameterized version side-by-side.
Create a short exam-style question and answer about SQL injection payloads and mitigations.

Question 2

-1' OR 5*5=26 --

Answer

That looks like a classic (albeit imperfect) SQL injection payload. Here’s a concise breakdown and what it means for an exam: What it tries to do - -1' ends a string literal in SQL. - OR introduces a boolean condition to alter the logic of the WHERE clause. - 5*5=26 is a boolean expression; since 5*5 equals 25, 25=26 is false. - -- starts a SQL comment, so the rest of the query is ignored. Putting it together, in a vulnerable query like: SELECT * FROM users WHERE username = 'USER_INPUT' AND password = 'PASS'; and with USER_INPUT = -1' OR 5*5=26 --, the query could become: SELECT * FROM users WHERE username = '-1' OR 25=26 --' AND password = 'PASS'; Which effectively reduces to: SELECT * FROM users WHERE username = '-1' OR 25=26; Because 25=26 is false, the OR clause relies on the first condition (-1). This might not grant access unless a user named -1 exists. The important thing is: the pattern demonstrates how an attacker tries to break out of a string literal and alter the WHERE logic, then uses -- to ignore the rest of the query. Key takeaways for exams - This is an injection attempt: it demonstrates closing a string, injecting an OR condition, and commenting out the rest. - The exact effectiveness depends on the rest of the query and data; in this case, 5*5=26 is false, so it wouldn’t trivially bypass authentication, but the technique is the vulnerability being tested. - Real risk comes from concatenating user input into SQL without parameterization. Defenses (what to write in an exam answer) - Use prepared statements / parameterized queries (bind user input as parameters, not string concatenation). - Use ORM/abstractions that automatically parameterize queries. - Validate and sanitize inputs; implement white-list checks for expected formats (e.g., usernames). - Principle of least privilege: database user used by the app should have minimal rights. - Disable multiple statements if your DB supports it, or configure your ORM incorrectly to prevent stacking statements. - Error handling: don’t reveal detailed SQL errors to the user; use generic messages. - Consider using stored procedures with parameters (but still ensure they’re parameterized). - Deploy Web Application Firewall (WAF) and monitor for suspicious patterns. If you want, I can: - Show a minimal vulnerable example and a secure, parameterized version side-by-side. - Create a short exam-style question and answer about SQL injection payloads and mitigations.