Writeups of All Apprentice Labs in Portswigger — All Lab’s Solution| Karthikeyan Nagaraj

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18. Insecure Deserialization

What is Insecure deserialization?

In this section, we’ll cover what insecure deserialization is and describe how it can potentially expose websites to…

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18.1 Lab: Modifying serialized objects | 2023

This lab uses a serialization-based session mechanism and is vulnerable to privilege escalation as a result. To solve…

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19. GrapQL Vulnerabilities

GraphQL API Vulnerabilities in Web App Penetration Testing | 2023

In this section, we’ll explain what GraphQL is, describe some types, explain how to find and exploit various kinds of…

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19.1 Lab: Accessing private GraphQL posts | 2023

The blog page for this lab contains a hidden blog post that has a secret password. Find the hidden blog post and enter…

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20. HTTP Host Header Attacks

HTTP Host Header Attacks in Web App Penetration Testing | 2023

In this section, we’ll explain what Host Header Attack is, describe some types, explain how to find and exploit Host…

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Host HTTP Header Attacks: Safeguarding Against Vulnerabilities | 2023

Unveiling and Defending Against Host HTTP Header Vulnerabilities | Karthikeyan Nagaraj

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20.1 Lab: Basic password reset poisoning | 2023

This lab is vulnerable to password reset poisoning. The user Carlos will carelessly click on any links in emails that…

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20.2 Lab: Host header authentication bypass | 2023

This lab makes an assumption about the privilege level of the user based on the HTTP Host header. To solve the lab…

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21. OAuth Vulnerabilities

OAuth 2.0 Authentication Vulnerabilities in Web App Penetration Testing | 2023

In this section, we’ll explain what an OAuth Attack is, describe some types, explain how to find and exploit OAuth, and…

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21.1 Lab: Authentication bypass via OAuth implicit flow | 2023

This lab uses an OAuth service to allow users to log in with their social media accounts. Flawed validation by the…

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22. JWT Attacks

JWT attack vulnerabilities in Web App Penetration Testing | 2023

In this section, we’ll explain what an JWT Attack is, describe some types, explain how to find and exploit JWT, and…

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22.1 Lab: JWT authentication bypass via unverified signature | 2023

This lab uses a JWT-based mechanism for handling sessions. Due to implementation flaws, the server doesn’t verify the…

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22.2 Lab: JWT authentication bypass via flawed signature verification | 2023

This lab uses a JWT-based mechanism for handling sessions. The server is insecurely configured to accept unsigned JWTs…

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23.1 Lab: CORS vulnerability with trusted null origin | 2023

This website has an insecure CORS configuration in that it trusts the “null” origin.To solve the lab, craft some…

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23. CORS and Access Control

23.1 Lab: CORS vulnerability with trusted null origin | 2023

This website has an insecure CORS configuration in that it trusts the “null” origin.To solve the lab, craft some…

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23.2 Lab: User ID controlled by request parameter | 2023

This lab has a horizontal privilege escalation vulnerability on the user account page. To solve the lab, obtain the API…

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23.3 Lab: User ID controlled by request parameter, with unpredictable user IDs | 2023

This lab has a horizontal privilege escalation vulnerability on the user account page, but identifies users with GUIDs…

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