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浅谈ActiveX漏洞分析与挖掘
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ourren
August 05, 2011
Technology
330
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浅谈ActiveX漏洞分析与挖掘
ActiveX漏洞分析与挖掘
ourren
August 05, 2011
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Transcript
By: youstar 2011.8.5 浅谈ACTIVEX漏洞分析与挖掘
内容概述 ActiveX简介 漏洞类别 漏洞调试 漏洞利用 漏洞挖掘
ACTIVEX简介 ActiveX、Com、Ole • 从时间的角度讲,OLE是最早出现的,然后是 COM和 ActiveX; • 从体系结构角度讲,OLE和ActiveX是建立在COM 之上的,所以COM是基础; •
单从名称角度讲,OLE、ActiveX是两个商标名称, 而COM则是一个纯技术名词。
ACTIVEX简介(续) ActiveX与Java • 非解释,速度快 • 多种语言编写 • 功能更加强大 • 不具备平台无关性(只支持IE)
调用 • 利用唯一CLSID标识
ACTIVEX简介(续) 安全接口 • 是否实现安全接口(IObjectSafety) 初始化安全 • 本地或者远程数据初始化接口 安全脚本 • 是否允许脚本访问
Kill Bit • 禁止ActiveX运行(0x00000400)
漏洞类别 不安全接口 • 导出函数提供不安全的接口功能,比如操作 注册表,读写文件等等。 函数参数漏洞 • 控件本身一些函数在处理参数的时候出现了 参数长度未检查造成溢出。
漏洞调试 工具 • IDA +OllyDbg+COM Explorer/COMRaider 方法(动态) • 关键函数:DispCallFunc(位于OLEAUT32.dll)。 •
Call near ecx 方法(静态) • IDA(OD定位)
漏洞利用 方式一 • 引用CLSID调用接口 • 参见:exploit1.html 方式二 • Heap spray
• 参见:exploit2.html
漏洞挖掘 工具 • COMRaider/Dranzer • COM Explorer • Python DIY
方法 • 查看相关接口函数 • 对其属性/方法进行fuzzing
Thank you!