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190330 逆向-嘉韦思杯re2
7 years 2 months ago
划一波水,re1秒了,re2看起来挺有意思的就处理一下
main函数有一个花指令使得CreateFunction失败
jmp跳到了自己指令的中间部分,NOP掉即可
然后重新在开头按P或者右键CreateFunction就可以F5了
main函数里没啥好说的,这个花不去也无所谓,反正汇编也看得出来call 8048580要返回1才可Correct
先看一下这个函数的CFG
比较像控制流平坦化或...
whklhhhh
315MHz 遥控器固定码信号分析和重放 - H4lo
7 years 2 months ago
某宝上买了一个可以发射固定码信号的 315 MHz 遥控器和 315 MHz 的超再生接收模块,这里尝试录制并解析一下发散的信号。 使用工具 HDSDR + RTL SDR + 遥控信号器 + Audacity 信号分析 遥控器一共有 A、B、C、D 四个按键,每个按键对应不同的信号载波 分别录制好
H4lo
190328 逆向-浅谈反调试
7 years 2 months ago
调试机制
Linux
通过ptrace系统调用来调试子进程
对于create类型,与正常创建子进程工序相同,通过fork创建子进程后使用traceme来告知内核它需要被调试,这样等到exec执行的时候内核就会产生SIGTRAP,此时调用wait的父进程就会接收到这个信号并ptrace子进程,从而使得调试优先于子进程的所有内容
而对于attach类型,是父进程直接使用ptrace去调试其他进程,如果...
whklhhhh
LD_PRELOAD & putenv() 绕过 disable_functions & open_basedir - 淚笑
7 years 2 months ago
这次TCTF中一道题,给出了一个PHP一句话木马,设置了open_basedir,disable_functions包含所有执行系统命令的函数,然后目标是运行根目录下的/readflag,目标很明确,即绕过disable_functions和open_basedir,当然我还是一如既往的菜,整场比赛
淚笑
2019 安恒周周练西湖论剑特别版 pwn 题目wp - H4lo
7 years 2 months ago
pwn1 考点:构造 shellcode,patch 汇编指令 IDA 查看反汇编,程序的逻辑很简单如,如果 直接 f5 的话 IDA 可能识别不出来函数,问题出在 0x080484CF 这个地方, 指令识别不出来, 所以这里可以先 patch 成 nop,之后 f5 就正常了 。 程序把输入当成
H4lo
Tasteless challenges hard WP - 淚笑
7 years 2 months ago
hard Level 5- Fred CMS 十有八九是注入,不过测试引号和转义符并没发现什么,于是跑了下密码字典,竟然发现网页提示 sql injection detected! ,然后发现原来是密码中存在or关键字 测试了username处发现未拦截关键字,那注入点应该只存在于password,
淚笑
The AWS Cloud Security Issues You Don’t Want to Ignore
7 years 2 months ago
AWS is the biggest name in IaaS, but the shared responsibility model leaves you open to risk. A full approach to AWS cloud security can fill the gap.
Avishag Daniely
Five Easy Steps to Keep on Your Organization’s DevOps Security Checklist
7 years 2 months ago
F5's Lori MacVittie writes for Tripwire, Inc., sharing five easy steps you can take to help improve security without sacrificing speed.
190326 逆向-MFC逆向技巧
7 years 2 months ago
MFC
简介
微软基础类库(英语:Microsoft Foundation Classes,简称MFC)是微软公司提供的一个类库(class libraries),以C++类的形式封装了Windows API,并且包含一个应用程序框架,以减少应用程序开发人员的工作量。
–百度百科
虽然由于实际应用中MFC似乎即将被淘汰,(据说微软放弃更新十几年,但从版本号和种种迹象来看似乎是还在不断更新的,V...
whklhhhh
2016 hctf fheap 题解 - H4lo
7 years 2 months ago
题目链接 https://github.com/zh explorer/hctf2016 fheap 题目分析 题目功能只有 malloc 和 free 的功能,查看堆的布局: 全局指针没有置空, 导致 uaf 和 double free 漏洞 ,两种都可以做,但是这题的重点是绕过 PIE。 dou
H4lo
0ctf Wallbreaker Easy Writeup
7 years 2 months ago
本文首发于先知
周末打了两天, 自闭 web 狗就做出来这一题, 另一题不知道调用啥 mbean 能拿 shell. 总之题目质量真的是非常高, 学到了很多.
描述 1Imagick is a awesome library for hackers to break `disable_functions`. 2So I installed php-imagick in the server, opened a `backdoor` for you. 3Let's try to execute `/readflag` to get the flag. 4Open basedir: /var/www/html:/tmp/949c1400c8390865cb5939a106fec0b6 5Hint: eval($_POST["backdoor"]);CERT-UK Annual Report 2015/16
7 years 2 months ago
Introducing Guardicore Cyber Threat Intelligence
7 years 2 months ago
Introducing Cyber Threat Intelligence (CTI), a freely available resource to assist in identifying and investigating malicious IP addresses and domains.
Daniel Goldberg & Ravit Greitser
从一道 CTF 题了解密码学中的 Meet-in-the-middle 攻击
7 years 2 months ago
本文首发于先知
在家里无聊打了 nullcon, 其中有一题用到了 Meet-in-the-middle 这种攻击方式,
在这里分享给大家.
Application Protection Report 2019, Episode 1: PHP Reconnaissance
7 years 2 months ago
Analysis of sensor data from 2018 revealed a big focus on PHP generally, and specifically a large, unsophisticated reconnaissance campaign looking for unsecured databases with PHP front ends.
Application Protection Report 2019, Episode 1: PHP Reconnaissance
7 years 2 months ago
Analysis of sensor data from 2018 revealed a big focus on PHP generally, and specifically a large, unsophisticated reconnaissance campaign looking for unsecured databases with PHP front ends.
Application Protection Report 2019, Episode 1: PHP Reconnaissance
7 years 2 months ago
Analysis of sensor data from 2018 revealed a big focus on PHP generally, and specifically a large, unsophisticated reconnaissance campaign looking for unsecured databases with PHP front ends.
Guardicore Threat Intelligence Helps Cybersecurity Community Research Attacks and Mitigate Risks
7 years 2 months ago
This post discusses how Guardicore Labs helps Guardicore customers and the security community enhance their security posture.
Akamai
CVE-2019-6446 浅析
7 years 2 months ago
numpy 反序列化 CVE-2019-6446 浅析