Serverless security considerations in Cybersecurity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to identify a key security concern in serverless computing.

Cybersecurity

One major security concern in serverless is [1] due to the shared environment.

Drag options to blanks, or click blank then click option'

Anetwork speed

Bdata isolation

Chardware failure

Duser interface

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing network speed with security

Thinking hardware failure is the main concern in serverless

Data isolation is critical because serverless functions run in shared environments, so isolating data prevents leaks between users.

2fill in blank

medium

Complete the sentence to explain a security best practice for serverless functions.

Cybersecurity

To reduce risk, serverless functions should have [1] permissions following the principle of least privilege.

Drag options to blanks, or click blank then click option'

Amaximum

Bshared

Cminimal

Ddefault

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming maximum permissions improve security

Using default permissions without review

Minimal permissions ensure functions only access what they need, reducing potential damage if compromised.

3fill in blank

hard

Fix the error in the security practice described below.

Cybersecurity

Serverless functions should avoid [1] to prevent unauthorized access to resources.

Drag options to blanks, or click blank then click option'

Aencrypting data

Busing environment variables

Clogging errors

Dhardcoding credentials

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing environment variables with hardcoding

Thinking logging errors is a security risk in this context

Hardcoding credentials in code is risky because it can expose secrets if the code is accessed. Using environment variables or secret managers is safer.

4fill in blank

hard

Fill both blanks to complete the security measure for serverless functions.

Cybersecurity

Implement [1] to monitor function activity and use [2] to control access based on user identity.

Drag options to blanks, or click blank then click option'

Alogging

Bfirewalls

Cidentity and access management

Dcaching

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up firewalls with IAM

Choosing caching instead of logging

Logging helps track what functions do, and identity and access management (IAM) controls who can use or invoke functions.

5fill in blank

hard

Fill all three blanks to complete the serverless security best practices.

Cybersecurity

Use [1] to protect data in transit, [2] to secure stored secrets, and [3] to limit function execution time.

Drag options to blanks, or click blank then click option'

Aencryption

Bsecret managers

Ctimeouts

Dload balancers

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing load balancers with security controls

Not using secret managers for credentials

Encryption protects data moving between systems, secret managers keep credentials safe, and timeouts prevent functions from running too long and causing issues.

Practice

1. What is a key security principle to follow when configuring permissions for serverless functions?

easy

A. Allow permissions only during business hours

B. Give all permissions to avoid errors

C. Use default permissions without changes

D. Grant only the minimum permissions needed for the function to work

Solution

1. Step 1: Understand the principle of least privilege

   Least privilege means giving only the permissions necessary for a task, nothing extra.

2. Step 2: Apply least privilege to serverless functions

   Serverless functions should have minimal permissions to reduce risk if compromised.

3. Final Answer:

   Grant only the minimum permissions needed for the function to work -> Option D

4. Quick Check:

   Least privilege = Grant minimum permissions [OK]

Hint: Always limit permissions to what is strictly needed [OK]

Common Mistakes:

• Giving too many permissions increases risk
• Using default permissions without review
• Assuming permissions can be broad safely

2. Which of the following is the correct way to validate input data in a serverless function?

easy

A. Ignore input validation to save time

B. Validate inputs against expected formats and reject invalid data

C. Trust all inputs from authenticated users

D. Validate inputs only after processing

Solution

1. Step 1: Recognize the importance of input validation

   Validating inputs prevents malicious or malformed data from causing harm.

2. Step 2: Apply validation before processing inputs

   Rejecting invalid data early protects the function and backend systems.

3. Final Answer:

   Validate inputs against expected formats and reject invalid data -> Option B

4. Quick Check:

   Input validation = Check and reject bad data [OK]

Hint: Always check inputs before using them in your code [OK]

Common Mistakes:

• Trusting inputs from authenticated users blindly
• Skipping validation to speed up development
• Validating inputs only after processing

3. Consider this serverless function snippet that processes user data:

def handler(event):
    user_input = event.get('input')
    if not user_input:
        return 'No input'
    return f'Processed: {user_input}'

What is a potential security risk in this code?

medium

A. It does not validate or sanitize the user input

B. It does not encrypt the user input

C. It uses a return statement

D. It checks if input is missing

Solution

1. Step 1: Analyze input handling in the function

   The function accepts user input but does not check if it is safe or clean.

2. Step 2: Identify missing input validation or sanitization

   Without validation, malicious input could cause injection or other attacks.

3. Final Answer:

   It does not validate or sanitize the user input -> Option A

4. Quick Check:

   Missing input validation = Security risk [OK]

Hint: Look for missing input checks in code snippets [OK]

Common Mistakes:

• Thinking encryption is needed for all inputs
• Confusing return usage with security
• Ignoring input validation importance

4. A developer wrote this serverless function to encrypt data but it fails to run:

import cryptography

def encrypt(data):
    return cryptography.encrypt(data)

What is the main error?

medium

A. The cryptography module does not have a direct encrypt function

B. The function encrypts data correctly

C. Missing import for json module

D. The function encrypts data twice

Solution

1. Step 1: Check the cryptography module usage

   The cryptography library requires specific classes and methods for encryption, not a direct encrypt function.

2. Step 2: Identify the incorrect function call

   Calling cryptography.encrypt(data) will cause an error because no such function exists directly.

3. Final Answer:

   The cryptography module does not have a direct encrypt function -> Option A

4. Quick Check:

   cryptography.encrypt() does not exist [OK]

Hint: Check library docs for correct function names [OK]

Common Mistakes:

• Assuming all modules have simple encrypt() functions
• Ignoring import errors
• Confusing encryption with data formatting

5. You want to secure a serverless app that processes sensitive user data. Which combination of practices best improves security?

hard

A. Encrypt data only after processing and ignore monitoring

B. Grant full permissions to speed up development and skip input validation

C. Use least privilege permissions, validate inputs, encrypt data at rest and in transit, and monitor logs for suspicious activity

D. Use default permissions and rely on cloud provider security alone

Solution

1. Step 1: Identify best security practices for serverless apps

   Key practices include least privilege, input validation, encryption, and monitoring.

2. Step 2: Evaluate each option against these practices

   Use least privilege permissions, validate inputs, encrypt data at rest and in transit, and monitor logs for suspicious activity includes all important steps; others skip critical protections.

3. Final Answer:

   Use least privilege permissions, validate inputs, encrypt data at rest and in transit, and monitor logs for suspicious activity -> Option C

4. Quick Check:

   Combine key security steps = Strong protection [OK]

Hint: Combine multiple security steps for best protection [OK]

Common Mistakes:

• Skipping input validation or monitoring
• Granting excessive permissions
• Relying only on cloud defaults