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RaRCTF 2021 - optimizeme [Reversing]

optimize me was a reversing challenge during RaRCTF 2021 that got 16 solves. We are given an ELF binary and the following sentence: rust is fast, but not fast enough. $ file optimizeme optimizeme:...

Cybrics 2021 - LX100 [Forensic]

LX100 LX100 was one of the NETWORK challenges in Cybrics 2021. It got 38 solves during the competition and was valued at 192 points. The challenge consists of a network capture lx100.pcap Init...

RedPwn CTF 2021 - simultaneity [Pwn]

Simultaneity is a pwn challenge from RedpwnCTF 2021. We are provided a 64-bit Linux ELF. If we check the binary’s memory protection, we notice that it has full RELRO, PIE and NX protections enabled...

NorzhCTF 2021 - S1de Ch4nnel

NOTE: The following is a writeup for the solution we developed for this challenge after the end of the competition. Our thanks go to 0xShikoRuma for explaining the intended solution on Discord. S1...

OMH 2021 CTF - GRUB [Reversing]

GRUB is a reversing challenge that got 20 solves. We are given a bootable GRUB file called grub.iso: $ file grub.iso grub.iso: DOS/MBR boot sector; GRand Unified Bootloader, stage1 version 0x79, b...

WPICTF 2021 - Strong ARM [Pwn]

In this challenge we have an ELF binary that has been compiled for the aarch64 architecture. We do not need to reverse engineer the file because the source is already provided. First of all, we ex...

RITSEC 2021 - Baby Graph [Pwn]

In this challenge we are given an ELF64 binary. The challenge consists of getting remote code execution and reading the flag. We need to determine whether a given graph is Eulerian to get a prize (...

UMassCTF 2021 - Chains [Reversing]

Chains is a reversing challenge that got 20 solves. We are given a stripped aarch64 (ARM 64 bit) ELF binary called chains: $ file chains chains: ELF 64-bit LSB pie executable, ARM aarch64, versio...

Securinets CTF Quals 2021 - RUN! [Reversing]

RUN! is a reversing challenge that got 15 solves. We are a provided a Windows PE binary called wamup.exe and the following description: keygenme now! nc bin.q21.ctfsecurinets.com 2324 If we...

Codefest 2020 - Anime Is Love [Forensics]

Anime is love was one of the forensics challenges in Codefest CTF 2020. The challenge description reads: You know what to do. Author:pseudo_bot#7514 file: anime.jpg The file we are given looks ...