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FwordCTF 2021 - Containers? [Bash]

Containers? was a bash challenge during FwordCTF 2021 that got 9 solves. We are given an ELF binary, called sealer, and access to a remote server via SSH. If we log to the server we find two files...

FwordCTF 2021 - listening? [Forensic]

listening? was one of the forensics challenges in Fword ctf 2021. The challenge description reads: How Deep Can You Possibly Dig? Flag Format: FwordCTF{....} We are given a pcap file challenge....

FwordCTF 2021 - devprivops [Bash]

Devprivops is a bash challenge from FwordCTF 2021. We are given a ssh access to a machine with just two files in the home directory. The files are called: devops.sh and flag.txt, respectively. Onc...

Imaginary CTF 2021 - String Editor 2 [Pwn]

String Editor 2 is a pwn challenge from ImaginaryCTF 2021. We are given a compiled executable and the target server’s libc. The program is a very simple string editor that allows us to edit a 15 ch...

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...