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Shubham Chaskar

Shubham Chaskar is a core pentester with extensive experience as an application security engineer. He has certifications including CEH, eCPPTv2, and eWPTXv2. He has experience penetration testing with mobile apps, web applications, networks, cloud configurations, and thick-client apps. Bash, Python, Go, and PowerShell are his favorite programming languages to automate penetration testing.

CSRF & Bypasses

This article discusses Cross-Site Request Forgery (CSRF) attacks, a web security vulnerability where an attacker tricks an authenticated website user into performing an unwanted action, such as transferring funds or changing their email address, by exploiting the user's browser cookies. The article explains how CSRF attacks work and how attackers can bypass CSRF token validation to exploit vulnerabilities in web applications. It also discusses several techniques that can be used to bypass CSRF defense, including removing the referer header, bypassing the regex, and using different Content-Type values.
Apr 10, 2023
Est Read Time: 8 min

OAuth Vulnerabilites Pt. 2

OAuth is a widely-used protocol that enables users to authorize third-party applications to access their data from other services, such as social media or cloud storage. However, like any technology, OAuth is not immune to vulnerabilities. This is Pt. 2 of a two-part series by Core Pentester Shubham Chaskar.
Mar 20, 2023
Est Read Time: 10 min

OAuth Vulnerabilites Pt. 1

Welcome to part one of OAuth Vulnerabilities. Core Pentester Shubham Chaskar overviews Oauth, commonly used grant types, entities, misconfiguration, and more.
Jan 23, 2023
Est Read Time: 10 min

CSP and Bypasses

This blog post aims to demonstrate what CSP is and why CSP is implemented. And how attackers can bypass CSP. In this article, I will include how you can bypass some directives to achieve XSS on the target application.
Oct 12, 2022
Est Read Time: 9 min

File Upload Vulnerabilities

This blog aims to demonstrate how applications can be compromised using simple file upload functionalities. Core Pentester Shubham Chaskar will show how to bypass common defense mechanisms and upload web shells.
Aug 24, 2022
Est Read Time: 9 min

Attacking Windows Applications Pt. 2

Welcome to the second part of the blog series "Attacking windows application." In this blog, we go more in-depth on attacking these applications and the tools used.
Aug 4, 2022
Est Read Time: 10 min

Attacking Windows Applications – Part 1

In this two-part blog series, we will discuss the overview of thick client applications and the type of architecture present.
Jul 8, 2022
Est Read Time: 10 min