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목록CTF (20)
deayzl's blog
[2023 UMDCTF] You Want Me To Run What?? writeup (unintended)
Tool: ghidra 10.2.2 with GolangAnalyzerExtension Exploit: making utf-8 shellcode (pwnable) feat. I've never written any code in go language, so all of these are from internet references and quite a lot of my predictions. So there might be something wrong with my analysis. /* WARNING: Unknown calling convention */ /* Name: main.handleConnection Start: 004cd140 End: 004cdb00 */ void main.handleCon..
About Me
이름: 안현준대학: 단국대학교 사이버보안학과 23학번나이: 2003년생ctf 팀: cat :flag_kr:취미: 음악 듣기(발라드 제외), linux kernel, v8좋아하는 분야: Pwn, Revgithub: https://github.com/hyeonjun17 Contact: email: guswns0863@gmail.com discord: @deayzl Education: 2023.07 ~ 2024.03 , BoB 12th 취약점분석트랙 (top30)History: 2023.08 ~ , ctf team cat :flag_kr: 2023.09 ~ 2023.12, BOB12 project, Linux kernel에서 발생하는 Memory corruption으로 이어지는 Data-ra..
[VishwaCTF] 0 | 1 writeup
files: encrypt.c, isThisFileUseful.txt, justBinaries.txt, up_down.py isThisFileUseful.txt: 1001010110001010100011001000101110011110100101001001101010000110 justBinaries.txt: 11110100000101010111111101110011111001001101000010001101101101001100101100000111111110100111000110000001100011011111111101000010001101101100010110100100101100111110000111011111111001001000101010010100100011100000010100010010..
2022 Incognito CTF (2023.03.25 ~ 2023.03.26) (feat. 상장)
푼 문제: crawl, login, admin, chatting, DoNotDebug, Stack Machine, NAND, I'M FINE THANK U, AND U?, Bondee, WOW, ,STACKoverflow, MicCheck 최근 Dropper Lab 에 들어가고나서 바로 Incognito CTF 에 출전하게 되었는데, 여기에서 인생 처음으로 1등을 해봤다. 2023 핵테온 세종 CTF 직후에 바로 이어서 시작했고 그 후 밥 거르고, 밤 세면서 정신없이 풀었다. 그러다보니 정신이 좀 피폐해졌다. (Web 에서 어떤 문제가 sqli 인지, mysql 인지 기억조차 안날정도) 포너블 2문제, 포렌식 1문제는 못풀어서 아쉽지만... 최근 1등도 해보고, 신선하고 새로운 힙합 앨범도 나오고 등등 ..
[2022 Fall GoN Open Qual CTF] Private Storage writeup
#!/usr/bin/env python3 from Crypto.Cipher import ARC4 from base64 import b64encode import zlib from secret import flag, key file = {"flag.txt" : flag, "key" : key} def print_menu(): print("1. List file") print("2. Download file") print("3. Add file") print("4. Copy file") print("5. Remove File") print("6. Logout") def download_file(): filename = input("File name >> ").strip() if filename not in ..
[2022 Fall GoN Open Qual CTF] Bomblab - Hard writeup
undefined8 main(int param_1,undefined8 *param_2) { undefined8 uVar1; long in_FS_OFFSET; long canary; canary = *(long *)(in_FS_OFFSET + 0x28); if (param_1 == 1) { stdinaddr = stdin; } else { if (param_1 != 2) { printf("Usage: %s []\n",*param_2); /* WARNING: Subroutine does not return */ exit(8); } stdinaddr = fopen((char *)param_2[1],"r"); if (stdinaddr == (FILE *)0x0) { printf("%s: Error: Couldn..