BackdoorCTF 2018: bookkeeping Write-up

Solved by sherl0ck This was my first challenge that involved the shared memory object concept and I found it pretty interesting to solve. The provided binary began to segfault after an initial run and I contacted the admins who promptly addressed the issue and released an update for this challenge. The shared object was not... Continue Reading →


N1CTF 2018: vote Writeup

Solved by sherl0ck Firstly, kudos to the organizers for conducting such a quality CTF. Coming to this particular challenge, we were given the libc and the binary. The following were the mitigation's enforced on the binary- gdb-peda$ checksec CANARY : ENABLED FORTIFY : disabled NX : ENABLED PIE : disabled RELRO : Partial Reversing this... Continue Reading →

InCTF 2017: stupidrop Writeup

Challenge Author: sherl0ck This challenge was originally meant to be solved using srop (SigReturn Oriented Programming). But it ended up having a bug with which it was possible to directly invoke the execve syscall. This write-up will be focusing on solving the challenge using srop. As usual, let's start off by checking the permissions of the given binary.... Continue Reading →

InCTF 2017- GiantXOR Writeup

Author: s0rc3r3r Points: 250 Standard Encryption but can you break it? Intended Solution This challenge is a little bit tricky as compared to other crypto tasks. The text is encrypted using Repeating Key XOR, but instead of encrypting the normal plaintext, the function first encodes the message in base64 and then encrypts using Repeated Key... Continue Reading →

InCTF 2017: gryffindor pwn Writeup

Challenge Author - 4rbit3r The binary that was given was a 64-bit, dynamically linked unstripped one. Checking it's permissions - CANARY : ENABLED FORTIFY : disabled NX : ENABLED PIE : disabled RELRO : Partial Okay, nothing out of the ordinary here. The program is a standard menu driven program to add, delete and edit... Continue Reading →

InCTF 2017: warm_heap pwn Writeup

Author: 4rbit3r Hello, this was a nice challenge from InCTF 2017, let's see how to get the exploit working. As usual, running checksec on the binary gives: Nothing much here, let us look at the program itself. It is a menu driven program with some basic functionalities: Add note Edit note Remove note View note These... Continue Reading →

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