Authentication vulnerability testing in Testing Fundamentals - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is authentication vulnerability testing?

It is the process of checking if the login and identity verification parts of a system are safe from attacks that try to break in without permission.

beginner

Name a common authentication vulnerability.

Weak passwords or no limit on login attempts, which can let attackers guess passwords easily.

intermediate

Why is testing for session management important in authentication testing?

Because poor session handling can let attackers steal or reuse login sessions to access accounts without logging in again.

intermediate

What is brute force attack testing in authentication?

It is trying many passwords quickly to see if the system blocks or slows down attackers after wrong tries.

beginner

How can multi-factor authentication improve security?

By requiring more than one proof of identity, like a password plus a code sent to your phone, making it harder for attackers to get in.

What does authentication vulnerability testing mainly check?

A If the database is encrypted

B If the website loads quickly

C If login systems can be bypassed or broken

D If the user interface is user-friendly

Authentication vulnerability testing focuses on checking if login and identity checks can be bypassed or broken.

Which of these is a sign of a weak authentication system?

A Allows unlimited password attempts

B Requires strong passwords

C Uses multi-factor authentication

D Locks account after several failed tries

Allowing unlimited password attempts makes it easier for attackers to guess passwords.

What is the purpose of session management testing in authentication?

A To check if sessions can be stolen or reused

B To test website speed

C To verify database backups

D To check user interface colors

Session management testing ensures attackers cannot steal or reuse login sessions.

Which method helps protect against brute force attacks?

A No password required

B Allowing all login attempts

C Using simple passwords

D Account lockout after failed attempts

Locking accounts after several failed attempts stops attackers from guessing passwords endlessly.

Multi-factor authentication requires:

A Only a password

B More than one proof of identity

C No password

D Only a username

Multi-factor authentication asks for multiple proofs like password plus a code to increase security.

Explain why authentication vulnerability testing is important for software security.

Think about what happens if someone breaks into an account.

Describe common techniques used to test authentication vulnerabilities.

Consider how testers try to break login systems.

Practice

1. What is the main goal of authentication vulnerability testing?

easy

A. To ensure only authorized users can access the system

B. To check the system's speed under heavy load

C. To verify the user interface design

D. To test database backup procedures

Solution

1. Step 1: Understand authentication testing purpose

   Authentication testing focuses on verifying that only real, authorized users can access the system.

2. Step 2: Eliminate unrelated options

   Options about speed, UI, or backups do not relate to authentication vulnerabilities.

3. Final Answer:

   To ensure only authorized users can access the system -> Option A

4. Quick Check:

   Authentication goal = authorized access [OK]

Hint: Authentication testing checks who can enter the system [OK]

Common Mistakes:

• Confusing authentication with performance testing
• Thinking authentication tests UI elements
• Mixing authentication with data backup checks

2. Which of the following is a correct way to test for weak password acceptance during authentication?

easy

A. Try logging in with a password like 12345

B. Check if the system allows SQL queries in the username field

C. Test if the login page loads within 2 seconds

D. Verify if the password reset email is sent

Solution

1. Step 1: Identify weak password test

   Testing weak passwords means trying simple, common passwords like '12345' to see if the system accepts them.

2. Step 2: Differentiate from other tests

   Options about SQL injection, performance, or email sending are different security or functionality tests.

3. Final Answer:

   Try logging in with a password like 12345 -> Option A

4. Quick Check:

   Weak password test = simple password try [OK]

Hint: Use simple passwords to check weak password acceptance [OK]

Common Mistakes:

• Confusing weak password test with SQL injection test
• Testing page speed instead of authentication strength
• Mixing password reset with password strength testing

3. Consider this pseudocode for testing login lockout:

attempts = 0
while attempts < 5:
    login('user', 'wrongpass')
    attempts += 1
result = login('user', 'correctpass')

What should result be if the system locks the account after 5 failed attempts?

medium

A. Login successful

B. Account locked error

C. Password reset prompt

D. System crash

Solution

1. Step 1: Understand lockout after failed attempts

   After 5 wrong tries, the system should lock the account to prevent further access.

2. Step 2: Analyze final login attempt

   Even with the correct password, the account is locked, so login should fail with an account locked error.

3. Final Answer:

   Account locked error -> Option B

4. Quick Check:

   Lockout after 5 fails = account locked error [OK]

Hint: After 5 fails, login should block even correct passwords [OK]

Common Mistakes:

• Expecting login success after lockout
• Confusing reset prompt with lockout error
• Assuming system crashes on failed login

4. You wrote this test to check multi-factor authentication (MFA):

login('user', 'correctpass')
// skip MFA step
access = check_access()

Why might this test fail to detect an authentication vulnerability?

medium

A. It uses the wrong username format

B. It checks access before login

C. It tests password reset instead of login

D. It skips the MFA step, so it doesn't test full authentication

Solution

1. Step 1: Identify skipped MFA step

   The test logs in with correct password but skips the MFA step, missing a critical security check.

2. Step 2: Understand impact on vulnerability detection

   Skipping MFA means the test won't catch if MFA is bypassed, leaving a vulnerability undetected.

3. Final Answer:

   It skips the MFA step, so it doesn't test full authentication -> Option D

4. Quick Check:

   Skipping MFA = incomplete authentication test [OK]

Hint: Always include MFA step to test full authentication [OK]

Common Mistakes:

• Ignoring MFA step importance
• Confusing username format with MFA issues
• Mixing login and password reset tests

5. You want to test if the system properly prevents session fixation attacks after login. Which test approach is best?

hard

A. Verify if password reset emails are sent promptly

B. Try logging in with an invalid password multiple times

C. Check if session ID changes after successful login

D. Test if the login page uses HTTPS

Solution

1. Step 1: Understand session fixation attack

   Session fixation means attacker forces a known session ID before login to hijack session.

2. Step 2: Identify test to prevent session fixation

   The system should assign a new session ID after login to prevent fixation.

3. Final Answer:

   Check if session ID changes after successful login -> Option C

4. Quick Check:

   Session fixation test = session ID change after login [OK]

Hint: Session ID must change after login to stop fixation [OK]

Common Mistakes:

• Confusing session fixation with password errors
• Testing unrelated password reset or HTTPS only
• Ignoring session ID behavior after login