Nikhil Kumar

Nikhil Kumar, a Certified Ethical Hacker, works as a Information Security Consultant. He has experience in web application pen-testing, social engineering, password cracking and android pen-testing. He is also involved with various organizations to help them in strengthening the security of their applications and infrastructure.
Nikhil Kumar

Articles from Nikhil Kumar

Capture the flag (CTF)

DMV 1: VulnHub Capture the Flag (CTF) walkthrough

July 13, 2020

In this article, we will find an answer to a Capture the Flag (CTF) challenge published on VulnHub by the author Jonathan. As per the information given by th

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Cloud security

Amazon Inspector: A cloud-based vulnerability assessment tool

July 24, 2019

Introduction Over the last few years, we have seen a lot of high-profile data breaches in organizations that are using cloud-based infrastructure. A cloud-ba

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Penetration testing

Raven 1: CTF walkthrough

March 11, 2019

­In this article, we will attempt to solve a Capture the Flag (CTF) challenge which was posted on VulnHub by William McCann. According to the information

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Penetration testing

FourAndSix 2.1: CTF Walkthrough

February 25, 2019

In this article, we will solve a Capture the Flag (CTF) challenge that was posted on VulnHub by the author Fred. As you may be aware from my previous article

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Penetration testing

Bob 1.0.1: CTF walkthrough

February 21, 2019

In this article, we will learn to solve a Capture the Flag (CTF) challenge which was posted on VulnHub by “c0rruptedb1t.” According to the information given

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Penetration testing

BSides Vancouver: 2018 Walkthrough

July 4, 2018

In this article, we will learn to solve a Capture the Flag (CTF) challenge which was posted on VulnHub by "Abatchy." This CTF is a part of BSides Vancouver s

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Secure coding

Null byte injection in PHP

April 29, 2018

The null character is a control character with the value zero. It is presented in many character sets such as ASCII (American Standard Code of for Informatio

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Application security

Writing Exploit for Mini Share Software: Introduction

September 14, 2015

In this article, we will analyze another software and develop our own working exploit for it. The software which we will be discussing in this article is cal

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Malware analysis

Analyzing and writing a local exploit

June 18, 2015

So far, in the previous articles, we learnt how to exploit an application remotely. We ran the Python script directly on the Machine B, which was the attacke

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Application security

Dealing with bad characters & JMP instruction

May 28, 2015

So far, in previous articles, we have learnt how to develop our own working exploit for the Echo Server program; we used two different payloads with the expl

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General security

Overwriting the Stack

April 30, 2015

In previous articles, we got to know the basics of the Stack Based Buffer Overflow and changing the address in the run time by modifying the register value u

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Application security

Taking Control of the Process

April 23, 2015

In the previous article, we learned about the basics of the Stack Based Buffer Overflow, such as analyzing the stack, creating breakpoints and analyzing the

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