An auxiliary tool for iot vulnerability hunter

Overview

firmeye - IoT固件漏洞挖掘工具

firmeye 是一个 IDA 插件,基于敏感函数参数回溯来辅助漏洞挖掘。我们知道,在固件漏洞挖掘中,从敏感/危险函数出发,寻找其参数来源,是一种很有效的漏洞挖掘方法,但程序中调用敏感函数的地方非常多,人工分析耗时费力,通过该插件,可以帮助排除大部分的安全调用,从而提高效率。

  • 漏洞类型支持:缓冲区溢出、命令执行、格式化字符串
  • 架构支持:ARM

分享:slides

安装

该插件运行环境要求 IDA Pro 7.5,Python3。

  1. 下载本项目:https://github.com/firmianay/firmeye.git
  2. 安装依赖:pip install -r requirements.txt
  3. firmeyefirmeye.py 复制到 IDA Pro 插件目录下,例如 C:\Program Files\IDA Pro 7.5\plugins
  4. 打开 IDA Pro 并加载待分析固件程序。
  5. Ctrl+F1 查看插件使用帮助。热键:
    • Ctrl+Shift+s:主菜单
    • Ctrl+Shift+d:启动/禁用调试钩子
    • Ctrl+Shift+c:扫描代码模式(TODO)
    • Ctrl+Shift+x:逆向辅助工具
    • Ctrl+Shift+q:功能测试

使用方法

静态分析功能

敏感函数被分为 5 类:printf、strcpy、memcpy、scanf、system。分别对应各自的漏洞类型和检测规则。

动态调试功能

对静态分析得到的可疑地址下断点,并在调试时动态处理断点事件,获得参数、返回值等上下文信息。

命令行工具

利用 idahunt 可以让插件自动化批量运行,使用方法如下:

$ python3 idahunt.py --inputdir C:\xxxx --analyse --filter "names.py -a 32 -v"                      # 生成IDB
$ python3 idahunt.py --inputdir C:\xxxx --cleanup                                                   # 清理临时文件
$ python3 idahunt.py --inputdir C:\xxxx --filter "names.py -a 32 -v" --scripts "firmeye_cli.py"     # 运行脚本

改进方向

该插件目前还非常不完善,下面是一些改进方向,欢迎讨论和 PR。

  • 完善参数回溯逻辑,支持更复杂的指令语义识别
  • 支持函数间分析
  • 完善漏洞判断逻辑,降低误报率
  • 加入动态污点分析作为辅助
  • 支持更多体系架构,如 x86、MIPS 等
Owner
Firmy Yang
Information Security Student & CTF Player & member of @XDSEC, @xdlinux
Firmy Yang
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