ctf-writeups - CTF思路相关项目

项目说明

Quick writeups

#### Haxdump 2015 - pwnxy
Requests a page via a given GET request. The request results is placed directly into a printf, resulting in a string format vuln. From the vuln, o the exit entry in the GOT with a static stack address to execute code from the GET request

#### P_KR
"My first o" style. Simply give 0xCAFEBABE 14 times in order to o the local

Client/Ser to implement a binary search in order to find a random number in a range of numbers

Input a username and two passcodes in order to "login". Using the username field, o the pointer to where the first passcode writes. Use the first passcode field to o the exit entry in the GOT with the address of the system('/bin/sh') provided in the binary

Input a password, it is xor'ed with a key and if it matches the password from a file, you win. Logic error in setting a file descriptor while comparing the result. Missing parentheses allowed the attacker to control both the input password and the password used to check against.

Give a base64 encoded message, and get the md5 sum of the original message. Stack canaries are on. There is a "captcha" before sending your message that is calculated with the stack canary. Random is also seeded with time(), which we also know because we ha to the ser. Knowing this, we can calculate the calculate the stack canary ourselves. The base64 decode function allows an o to happen. The decoded message contains the canary at the correct location, and then a ret2system was easy peasy.

Implementation of the brainfuck language. Use the pointer to leak the address of puts then o puts with the address of a few instructions after puts in main. Send a second bf instruction with our rop payload of system('/bin/sh') from their libc. O puts a second time with a stack pivot to add to esp and reach our system call. PROFIT!

项目信息

开发语言：Python

Star 数：92

技术要点

该项目属于CTF思路方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕CTF思路相关项目展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。