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命运如同手中的掌纹,无论多曲折,终掌握在自己手中。

pwnhub公开赛-【迎中秋】BabyExec

没有注册码,刷一个,首先分析源代码。 <?php error_reporting(0); highlight_file(__FILE__); if ((string)$_GET['x'] !== (string)$_GET['y'] && md5($_GET['x']) === md5($_GET['y'])) { if(!isset($_GET['shell'])){ echo "Attack me!"; } else { $shell = $_GET['shell']; if(!preg_match("/[a-zA-Z0-9_$@]+/",$shell)){ eval($shell); } else { die('No,No,No! Keep it up......'); } }} else { die("No, way!");} ?> (string)$_GET['x'] !== (string)$_GET['y'] && md5($_GET['x']) === md5($_GET['y'] 需要md5强碰

DASCTF八月挑战赛writeup

0x00 easymath 题目代码 1 2 3 assert(len(open('flag.txt', 'rb').read()) < 50) assert(str(int.from_bytes(open('flag.txt', 'rb').read(), byteorder='big') << 10000).endswith( '1862790884563160582365888530869690397667546628710795031544304378154769559410473276482265448754388655981091313419549689169381115573539422545933044902527020209259938095466283008')) 简单搜索,发现https://ctftime.org/writeup/22374有道类似的题目,修改后

2021年暑期夏令营笔记(day7-day8)

## 0x00 shellcode从0到1 Linux系统调用表 https://github.com/torvalds/linux/tree/master/arch/x86/entry/syscalls https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md 0x01 Windows平台下的shellcode利用 Windows下的Shellcode 优势